M. iramdioa, from Yaylaymaw, of three whorls only, long. 30, diam. 17 mm.
At the latter locality the species was found in great abundance by Dr. Anderson
on the Second Expedition, as it was also on the First Expedition at Bham6 and
Manwyne; the small specimens, so well figured by M. Brot,1 were from the latter
locality; these specimens had been given in exchange by the Indian Museum to
the late Dr. Stoliczka, by whom they were sent to M. Landaner.
M e l a n i a (M e l a n o id e s ) r e e v e i , Brot.
Melania (Melanoides) reevei, Brot, Cat. Syst. M61an., 1862, p. 46, and Conch. Cab., pi. xi fig. 4
Nevill, I. e., p. 84.
M. balteata, Rv., pi. xx, fig. 144 B (not of Phil.)
A rather young specimen of this very distinct species was well figured as above
by Keeve; an adult specimen of tbe same species is figured in the ‘ Con.. Indica, ’
pi. lxxii, fig. 3. I t is a well characterized species, quite distinct from M. variaUlis,
peguensis and gloriosa, ^nd of these three it is nearest allied to the last. There
are specimens in the Indian Museum from Nounghenzik, in Pegu; it was also
obtained plentifully at Mandalay on the Pirst Expedition, and on the Second
Expedition at Myadoung.
var. IMBRICATA, TTfl.nl.
Melania reevei, var., Brot, Conch. Cab., pi. 11, fig. 4 A.
Melania reevei, var. imbricata, Haul., Con. Indica, pi. 158, fig. 4.
Melania {Melanoides) reevei, var. imbricata, Nevill, I. c>, p. 84.
About twelve specimens of this variety were obtained at Yaylaymaw. I t can
be easily distinguished from the type form by its more developed sculpture; it has
the same characteristic regular transverse ridges below the suture (four or five in
number), but in addition has throughout other interrupted transverse ridges, broader
than those near the suture and wider apart; it has also numerous longitudinal
ribs, possessing a tendency at times to become obsolete (varying much in this
respect in individual specimens); these ribs commence at the termination of the
sutural row of regular transverse ridges, and are generally distinct only on the last
few whorls; the columella is stained with a rich brown colour.
Yar. imbricata, of nine whorls, long. 65, diam. 26 mm
Sub-Genus P l o t ia , Ad.
M e l a n i a ( P l o t ia ) s c a b r a , Müll.
Bnceinum scabrum, Müll., Hist. Verm., p. 136; Con. Indica, pi. lxxiii, figs. 1-4.
Melania seabra, Müll.
Melania (Molia) scab a, Nevill, I. c., p. 84.
1 Mat6r. M&L, iii, pi. iv, figs. 12,13.
A few specimens were found at Myadoung ; they agree perfectly with Beeve’s
fig. 1 5 6 B (M. spmulosa, Lamk.)
Family—AMP TJIIÂRIDÆ.
Genus A m p t j l l a r i a , Lamarck.
A m p t jl l a b x a t h e o b a l d i , Hanl.
Ampullaria theobaldi, Hanley, Con. Indica, pi. 115, fig. 2 ; Nevill, I. c., p. 87.
? A m p u l la r ia m a m a , Rv., var. Con. Icon., fig. 57.
Unfortunately, none of the 1 6 specimens collected by Dr. Anderson at Bhamô
are quite full-grown, the outer lip in all of them being thin and sharp ; in the depression
of the spire they agree with Beeve’s figure of A. ma/wra, as well as the
typical figure of A. theobaldi ; the umbilicus is open, agreeing exactly with the
latter figure ; the coloration and shape of the aperture are also the same ; I f.hi-nlr
it very doubtful, however, if it can be separated as a distinct species from the common
Assam form, from which it only seems to differ by its larger size, less produced,
spire, slightly more open umbilicus, and in the coloration being a shade more vivid ;
in the latter two respects, however, some few Assam specimens approximate most
closely.
ACEPHALA.
Family— UNIONIDÆ.
Genus U n i o , Betz.
U n io m a r g in a l i s , Lamk., var. s a v a d i e n s i s , Nevill.
Unio marginalis, Lamk., Anim. s. Vert., t. vi> 1885, p. 544 ; Con. Indica, pi. ix, fig. 6 (sp. jtfv.)
Unio marginalis, var. savadiensis, Nevill, I. c., p. 37.
This variety is abundant at Sawady in the Thengleng stream, also at Bhamô
and at Shuaygoomyo ; four young specimens found at Myadoung probably also
belong to this form. The nearest figured variety is obesa, Hanl., * Con. Indica,’ pi. 44,
fig. 7 , from the Irawady ; var. savadiensis is of a more ovate shape, of a slightly
thinner texture, the nacre is of a light salmon or cream-colour, instead of the ordinary
bluish-white tinge characteristic of var. obesa, the difference of colour in the
nacre is constant both in young and old shells ; the lateral teeth are more convex,
the cardinal ones a little less strongly developed ; young specimens of both varieties
are prominently winged, as in var. lamellatus.1 Externally, young specimens are of
a gamboge-yellow colour, tinged with bright green on the wing.