MOLLUSCA OF INDIA. 65 
Key to Genera of Limacide and Arionide (continued). 
External characters. Genus or Subgenus. 
C. Anal aperture on the posterior right margin of the 
mantle removed from the respiratory orifice. 
c'’, No mucous gland. 
d‘, Respiratory orifice in middle of 
mibymtlley Gosasdonocedcosdoedascdeceunenceedac Hyalimax. 
Internal characters. 
A. Rectum close to respiratory orifice. 
a. Muscle-attachment of penis anterior to edge of 
mantle. 
a', Renal organ lying alongside the heart ...... acess 
b. Muscle-attachment of penis posterior to edge of 
mantle. 
b'. Renal organ partly surrounding the heart ... aie 
c. Muscle-attachment of penis near extremity of foot Geomalacus. 
B. Rectum behind the respiratory orifice, and radula 
OE GbUEL HEATH 117) 1S occadacoangrsancaoatooougacbocsedecadad Hyalimax. 
EXPLANATION OF PLATE XII. 
Fig. 1. Geomalacus maculosus, Allman: side view of extremity of foot, with 
mucous gland, from spirit-specimen. @, view from behind of ditto. 
. Ditto: shell, x 7. 
. Ditto: jaw, x 20. 
. Ditto: teeth of radula, x 360. 4a. 12th to 18th; 40. Outer- 
most laterals. 
. Ditto: generative organs, X 2. 
. Ditto: ditto, portion of, from second specimen. Male organ. 
Ditto: the basal portion of male organ, laid open. Gen.Ap., position 
of generative aperture ; the external opening is on the other side. 
. Ditto: position of renal organ, heart, and the retractor muscles, 
viewed from below, X 3. 
. Arion ater. Reigate. Position of above organs, similar view, X 2. 
. Limax agrestis, Miller: ditto, ditto, X 3. Mf, mantle, frontal 
edge; MJU., mantle, left margin; 7.m.0O., T., P., retractor-muscle 
attachments of odontophore, eye-tentacle, and penis; s, position 
of apex of shell. 
SDN wor 
— 
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Genus Heticarion, Férussac. 
I have been able lately to examine the animal of a species of this 
genus from Australia, kindly sent me, together with other interesting 
shells, by Dr. J. C. Cox, of Sydney, who has worked so long and 
so well at the shells of that country. The specimen is close to 
H. hyalina, Pfr., and is referred to in Dr, Cox’s ‘ Monograph of 
Australian Land Shells’ (1868), p. 85. I have named it cowiana, 
and shall refer to the anatomy when describing the Indian species 
that have been hitherto placed in this genus. I may now state that 
the Australian form differs in this respect very materially from the 
Fast-Indian ; that from Sydney, I find, resembles exactly that of 
Helicarion freycineti, Quoy and Gaimard, from New South Wales, 
figured so well in Dr. C. Semper’s ‘ Reisen im Archipel der Philip- 
pinen,’ pl. iii. fig. 6. 
Girasia of Gray is a very distinct subgenus of the Helicarionide. 
G 
