2 0 8 FEESH-WATER ALO/E FROM BURMA.
infeiioribus subrotuudatis, lateribus subreetis (vel levissime couvoxis), anguHa superioribus
late rotundatis, apice levissime convexo, cum granulo uno ad angulum iuferiovem et
granulia parvis duobus intra angulum, sicrie granulorum magnorum 5 intra et juxta
apicem ct granulo uno ad augulum superiorem unumquemque, verrucis rotundatis 3 ti-ans
centrum semicellularum ; a vertice viste late elliptic£e verrucis rotundatis 3 ad medium
utrobique, graiiulis parvis 3 ad polos, et serie granulorum 7 intra marginem lateralem
unuraquemque; a latere viste subcirculares, verruca rotundata magna ad medium lateria
uniuscujusqiie et granulo magno juxta apieem utrobique.
Long. 31//; lat. 22•o^i; lat. isthm. 6/^; crass. 17/^.
J7<ii.—Mansang, near Hsipaw (No. 24193).
This species bears some resemblance to C. èctium W. & Q. S. West (Alg. Madag. 1895, p. 7,
f. 29), but is distinguished by its oblong-re eta ngutsr semioells and by the three large rounded warts
in the centre of each semioell. The vertical view has more obtuse poles, and the apical series of
large granules projects slightly above the apex in the front view.
From C. WcUheimU Sehmidle (Ost-Afriea Dcsmid. 189S, p. 38, t. 8, f. 25) it diSers in the
from of tlie semioells, in its constriction, in the dispontion of the apical granules, and in the
absence of any granules above the isthmus.
It might also be compared with C. cyathiforme "W. & G. S. West (Some N. Amer. Desm. 1896,
p 248, t. 15, f. 9).
111. CoSMAKItlM BTJRKILLII Sp. n. (PI. XIV, fig. 13).
C. submediocre, ptcne l^-plo longius quam latum, profiindissirae constrictum,
6inu angusto-lineari estremo subampliato ; semicellula subrectangnlares, angulis basalibus
levissime rotundatis, lateribus parallelis, angulis superioribus rotundo-truncatis, apice
truncato et subrecto, cum granulo singulo ad augulum basalem et granulis paucis
(circ. 6) ad et intra margines laterales, cum dente obtuso ad angulum superiorem
unumquemque prope apicem et granulis magnis binis infra dentem, in centro semicellularum
granulis magnis circiter 14 in seriebus obliquis et verticalibus ordinatis et
scrobiculis minutis inter granules ; a latere viste subcirculares ; a vertice visse elliptic®,
granulis 5 ad medium utrobique, polis trigranulatis, cum granulis intra regionem polarem
et iuxta medium marginmn lateralum ; membrana punctata.
Long. 47-;V; lat. 34^; lat, istbm. 10M; crasa.
ITai.—Mansang, near Hsipaw (No. 24193).
This species should be compared with C. Freemanii W. & G. S. West.
V a r . BECTANGULARE v a r . n. (PI. x i v , fig. 14).
Var. minor, angulis superioribus semicellularum minus rotundatis et granulia
dentatis 3 instructis, granulis centralibus magnis propina ad apicem.
Long. 37-5—38-5M; lat. 25-5—37/^; lat. istbm. 8/^; crass. 20'5M.
Uab.—With the typical form, but more abundant (No. 24193).
112. COSMARIUM BLYTTII Wille, Norges Ferskv. Alg. 1880, p. 25, T. 1, f. 7.
Bah.—la springs on the river bank, Bhamo (No. 21501). Momauk, east of
Bhamo (No. 21551).
XANTHIDIUM. 2 0 9
113. COSMABIOM SUBCOSTATUM Nordst. Desm, Ital. 18T6, p. 37, t. 12, f. 13.
Long. 31/^; lat. 26/x; lat. iathm. 8-2^.
Bab.—In the Kan-gyi at Mudon (No. 24505).
Forma. ( = ? C. siibcrenatum Hantzsch var. divaricatum Wille, Fersko. Alg. Nov.
Semlj. 1879, p. 40, t. 12, f. 27).
Long. 24^; lat. 20^^; lat. isthm. 6-8/i.
.ffaJ.—Singaing, in the Kyaukse district (No. 22193).
Forma MINOR W. & G. S. West, Alg. Centrili Africa, 1896, p. 379, t. 361, f. 15.
Bah.—lxi flood rice-fields, Burdwan (No. 24674).
114. COSMARIUM SUBALATUM W. & G. S. West, Alg. Madag. 1895, p. 63, t. 7, f. 31.
Pyreuoidibus singulis; apicibus minus undulatis.
Long. 18—21/i; 15-5—19/^; lat. isthm. 4—4'8/i.
Bah. In springs on the river bank, Bhamo (No. 501). Mansang, near Hsipaw
(No. 24193).
115. CosMARiUM TEssKLATUM (Delp.) Nordst. Alg. et Char, i, 1880, p. 7.
DijsfUnctium tessellatiim Delp. Desm. subalp. 1877, p. 136, t. 21, f. 10-13.
Long. 115-120/x; lat. 63'5-67ìì; lat. isthm. 54/^.
iZflS. —Mansaog, near Hsipaw (No. 24193).
1 1 6 . COSMARIDM MANSANGENSE Sp. n. (PI, XIV, fig. 15).
C. subpavvum, circiter 2i-plo longius quam latum, leviter constrictum, ainu parvo
excavato; somicellulfc oylindrico-oblong®, lateiibus rectis, angulis basalibus levissime rotun
datis, apice late rotundato (scmicirculaii) ; a vertice visas circulares ; membrana granulata,
granulis in seriebus verticalibus (cum iis marginibus visis 11) ordinatis, et in ambitu
toto semicellulffi granulis circiter 26.
Long. 61^; lat. 24^^.; lat. isthm. 18^.
iSiJ.—Mansang, near Hsipaw (No. 24193).
This speoics stands nearest to C. cyiindricim Ralfs (Brit. Desm. 1848, p. 106, t. 17, f. 4) from
wldoh it is distinguished by the parallel sides of the semicells, by broadly rounded apices, and the
more excavated constriction.
It should also be compared with C. pseudamcsnum Wille (Sydamerik. AlgtJ. 1884, p. 18, t.
1, f. 37).
Genus : Xanthidium Ehrenb.
117. XANTHIDIUM SPINOSUM (Joah.) nob.
Cos^nariutn spinosum Josh. Burm. Desm. 1886, p. 647, t. 25, f. 3, 4.
We have esamined a number of Joshua's original specimens of this Dosmid and
give an accui'ate figure of one of them (PI. xv, fig. 1). The following is an amended
description of the species:—
X. submediocre, paullo longius quam latum (sine spinis), profunde constrictum,
sinu aperto apicem versus angusto; semicellulee 'elliptico-subsemicircularee, angulia
ANN. ROT. BOT. GABP. CÌLOOTTA. T o t . VI.