MOLLUSCA OF INDIA. 147 
me by Dr. J. C. Cox, with the animal in spirit. The following 
note is attached by Mr. Geoffrey Nevill :—* Helicarion hyalina, Ptr., 
var. (Sydney). Coloration exact. When taken fresh from its damp 
home on the mossy sides of large stones &c., the mantle-lobes almost 
entirely cover the shell, leaving only a little bare spot. Top figure 
[Plate XLI. fig. 1] is as it appears after a day’s confinement.” 
T am much indebted to Dr. Cox for sending this species and some 
others from Australia, and I am now able in consequence to show 
more clearly the anatomy of true Helicarion and the points of dif- 
ference between it and the Indian allied forms; they are sufti- 
cient to keep them subgenerically apart. 
Resembles exactly in its anatomy H. freycineti, Fér. (not Quoy 
and Gaimard), from N.S. Wales, figured in Semper’s Reis. Philipp. 
pl. il. fig. 1 (Plate XLI. fig. 9), even in the form of the flagelliform 
kale-sae. 
The mantle (figs. 2, 3) has a similarity to that of Durgella: the 
right shell-lobe is, however, the smallest, aud is broadly tongue-like ; 
the left shell-lobe includes the whole upper and outer margin of the 
peristome and terminates on the left posterior side in a tongue-like 
process ; both right and left dorsal lobes are very ample, the left one 
especially, continuing all round to the posterior side and uniting 
with the right shell-lobe (fig. 4). The mucous gland is very dis- 
tinct, with a small lobe or horn above it, but the foot above does 
not appear to be sharply keeled. 
Generative organs (Plate XLI. figs. 8, 8a). Ovo-testis in two 
rounded masses, very difficult to separate from the liver in which it 
is imbedded; hermaphrodite duct extremely and closely convoluted ; 
albumen-gland small, hard, and oblong; penis long, twisted back 
on itself and swollen at the base, with a long flagellum, within 
which the capreolus was in process of formation; spermatheca long, 
with a swollen rounded extremity. It had no dart-sac or amatorial 
organ, and in this respect it differs from the Indian species that 
have hitherto been placed in this genus; the salivary gland rather 
lengthened, 
Jaw (fig. 6) with a central projection, like H. ceratodes, Pfr. 
In the lingual ribbon (figs. 7, 7a, 7 6) the arrangement of the 
teeth is 
AQHS 2 AG. is MG! 2 ekO 
oot 4d Aoo38 
The numbering of the last median teeth in fig. 7a is unfortunately 
reversed, 17 and 18 should be the two teeth of transition form next 
the bicuspid laterals. The outermost laterals are very small (fig. 7 6) 
and several are tricuspid in this specimen. I give a copy of the 
part of the radula of H. cuvieri, Fér., as given by Semper (J. c. pl. vi. 
fig. 11) to show the correspondence. 
