196 FEESH-WATER ALG-E FEOM liüKMA.
58. PNÍDKOT.T;^{IU^[ INDICUM (GRUN.) Limd. De.sm. Suec. 1871, p. 90.
Docidmm I^idioam Grun. Diat. u. Dosm. lus. Bank, 1865, p. L'i, t. 2, f. 18.
Long. 422-784/1; kt. ad bas. semicell. 3.5-34-ö/i; lat. ad med. semicell. 18-
25/i; lat. ad apic. lo-SO/t.
//ai.—Kyauktaga, Pegu district (No. 22V2i). Singaing, Kyaukse district.
No. 22193). In swamp, Katha (No. 22677).
Tlie -Burmoae speeimeua of this Desmid varied much in size, but their relfttivo proporfciors
ronmioed fairly constaut. All possessed a large undulation at tho bass of the semicells, and sjveral
smaller ones jost above it. The lateral nmigios aboTe the undulations were parallel and the apes
truneate.
Var. CKASSIUS Lagerh. Algol. Bidr. 1886, p. 199.
Loog. 560^; lat. ad bas. seniicell. 54;^; lat. ad med. semicell. 46^4 ; lat. ad
apic.
7/a5.—Momauk, east of Bhamo (No. 21551).
I t is hardly possible to separate this variety from Ti. maainnm (ReinsoVi) Ijund., and it is
questionable whether it would not be better placed as a form of that species. The undulations
at the base ace variable, and the general proportions are much nearer those of PI. maximum.
59. PLEUROT^NII^I TBABECULA (Ehrenb.) Näg. ; W . &. G. S. West, Brit. Desm. i,
X904, p. -¿Od, t. 30, f. 11-13.
Uab.—ln springs OQ the river bank, Bhamo (No. 21501). Momauk, east of
Bhamo (No. 21551). Kyauktaga, Pegu district (No. 22124;. Between Thingan-nyinaung
and Kawkareik, in the side-channel of a stream (No. 24483),
Genus: Euastrum Ehrenb.
60. EUASTKUII DIDELTA (Turp.) Ralfs, 1844; Brit. Desiu. 1848, p. 84, t. 14,
f . 1; W. &. G. S. West, Brit. Desm. ii, 1905, p. 15, t. f. 3-7.
Forma minor; long. 82>t; lat. 4 9 ' 5 ; i ; lat. isthm. 12/*.
iZfli.—Mansang, near lisipaw (No. 24193).
61. EUASTRUM SINUOSUM Lenorm.; Ralfs, Brit. Deam. 1848, p. 8 5 ; "W. & G. S.
WüSt, Brit. Desm. ii, 1905, p. 20, t. 36, f. 1.
Long. 65/i; lat. 34'5/i; lat. isthm. 9-5/^.
JIab.—lxi the Kan-gyi, at Mudon (No. 24505).
62. EUASTRUM AXSATUM Ralfs, Brit. Desm. 1848, p. 8 5 ; "W. & G. S. West,
Brit. Deam. ii, 1905, p. 27, t. 36, f. 10-13.
iZaS.—Between Thingan-nyi-naung and Kawkareik, in the side-channel of a
stream (No. 24483).
63. EUASTRUM INERUIUS (Nordst.) Turner, Freshw, Alg. E. Lidia, 1893, p. 86,
t. 10, f. 51.
E. spinulnsum Delp. aubsp. inenmus Nordat. Alg. et Char, i, 1980, p. 9 f
1, f. 17.
EUASTllUil. 197
V a r . BURMENSE v a r . n. ( P I . x i v , fig. 10).
Var. tuuioiibus tiibus trans basin seniiceliularum, iis latera)ibu8 minoribus ;
semi-cellulai a vertice visfe cum tumore minore granulato utrobique inter
tumorem medianum ot polum unumquemquo.
Long. 55FI; lat. 52^^; lat. lob. polar. 21/X: lat. isthm, \\IJ-\ crass. 27'5M.
Hah.—In the Kan-gyi at Mudon (No. 2450Ò).
64. EUASTKUM TKUNCATUM .Josh. Burmese L»esm. 1886, p. 639, t. 23, f. 6, 7,
W. & G. S. West, Freshw. A]g. Ceylon, 1902, p. 152, t. 20, f.
9, 10 (char, emend).
ZTaJ.—Maiisang, near Hsipaw (No. 24193),
65. EADSTEUM ASPERUM Borge, Austral. Silsswasserchlor. 1896, p. 11. t. 1, f. 12.
Long. 88M; lat. 44-5ÍÍ,; lat. isthm. 14-5^4; lat. lob. polar. 2 7 - 2 9 ^ ; crass. 30/X.
(PI. XIV, tig. 3).
Hah.—iVJaiisang, near Hsipaw (No. 23193).
This interesting species appears to be well characterized by reason of the niatoillate protuberances
across the base of the semioells. In side view it is even more charaoteristic, being unlike
any other Euastrum of its kind. It has only previously been recorded from Queensland.
66. EUASTRUM SEREATUM Josh. Burmese Desm. 1886, p. 639, t. 23, f. 1, 2.
The following is an amended description of this. species : —
E. submediocre, pa;ne l|-plo lougius quam latum, profundissime constrictum
sinu angusti88imo-Hneari extremo subampliato; semicellul® 5-loba3, incisuris lateralibus
non profundis et subapertis, iis superioribus profundioribus quam iis inferioribus ;
lobis latcalibus brcvitev subrectangularibus, leviter bilobulatis, lobubs retuao-emargiaatis;
lobo polari oblongo-trapeziformi, lateribus retusis, angulis superioribus dentati»
et angulis inferioribus emarginatis, apice leviter convexo cum incisura mediana profunda
et aperta ; tumore in centro semicellularum et serobiculis binis supra tumorem,
verruca rotundata intra lobum lateral em unumquemque et verrucis emarginatis duobus
intra lobum polarem ; a vertice visfe oblongo-elliptic«, tumore prominenti emarginato
ad medium utrobique, polis leviter trilobia ; a latere visae subovat» apice subacuto,
prope basin tumore emarginato et apicem versus tumore emarginato minore utrobique.
Long. cO/ì; lat. 28'5m; lat. isthm. 7'8,i.
Tho above description and measurements are taken from one of Joshua's origiDal specimens,
of which we also give a figure (PI. xiv, fig. 2).
Joshua gives 53/t ¡vs the length and 35/x as the breadth of his species, measurements wJiiob are
somewhat larger than his actual specimens. As we found in the case of E. Imnaatum, another of
Joshua's species ot which we published an amended description, that his measurements were also
longer thau any of the specimens we observed, we are inclined to think that Joshua's meaaurements
are no mora to be relied upon than his figures. We infer that Joshua's " lobie . . . . interne
conspootis distincte senatis " lefers to the rounded warts within the lateral lohes, but his description
lacks precision aud is very imperfect.
Forma angulis inferioribus lobi polaris miidentatis.
Long. 47íí; lat. 2 8 ^ ; lat. isthm. 7-5^; crass. 19/1 (PJ. xiv, fig. 9).
Ziai.—Mansang, near Hsipaw (No. 24193).