158 LAND AND FRESHWATER 
even in some species of Girasia we see a tendency to a similar de- 
velopment, viz. a diminution in the size of the muscular foot and the 
body-cavity extending considerably further back into it in a posterior 
direction and occupied by a great fold of the intestine and a mucous 
gland. The evidence of gradual development shows that Girasia 
must be placed towards the end of the series of genera of Indian 
Zonitide. Many more genera must yet be examined before this 
classification can be completed. 
EXPLANATION OF PLATE XXII. 
All enlarged 2:4. 
Fig. 1. spade petrosa, Hutton. Rajmahal. 
2, 2a prona, Nevill. Mussoorie, N.W. Himalaya. 
3. exul, Theobald. Andaman Islands. 
z 4a, —— splendens, Hutton. Mussoorie. 
shengorensis, G.-A. Dafla Hills. 
8. 6a. choinix, Benson. Andamans. 
EXPLANATION OF PLATE XXIII. 
All enlarged 2°4. 
Fig. 1. Macrochlamys hardwickei, G.-A. Calcutta. 
2. Ditto. Sylhet. 
3. Ditto, var. politulus. Eastern Assam. 
4. Ditto, var. Darrang. 
5. Macrochlamys lthotaensis, G.-A. Lhota-Naga Hills. 
6, 6a. opiparus, G.-A. Darjiling. 
EXPLANATION OF PLATE XXIV. 
All enlarged 2°4. 
. Macrochlamys atricolor, G.-A. North Cachar Hills. 
. Ditto, large var. Munipur Hills. 
: Ditto, small var. Munipur Hills and Burrail range. 
Ditto, var. Dafla Hills. 
Ditto, var. Khakyen Hills, Upper Burmah. 
M. cacharica, G.-A., var. glauca. Dafla Hills. 
. M. lubrica, Bs. Darjiling. 
Fig. 
NID OUP O9 bo 
EXPLANATION OF PLATE XXV. 
Macrochlamys atricolor, G.-A. Munipur Hills. 
. Animal, spirit-specimen, showing mantle and shell-lobes, x 2°4. 
. Ditto, viewed from right side, showing position as regards the 
shell, x 1°5 
. Ditto, mantle, viewed from left: side, x 2°4. 
Entire animal, left side, X 2°4. 
Head, viewed from right side, showing position of generative aper- 
ture, x 2°4. 
Head, front view, showing form of mouth, x 4. 
Extremity of foot, viewed from behind, x 7. 
. Mantle, viewed from below or inside, showing the division into 
two lobes. 
Same view of mantle in M. indica, Bs. Calcutta. 
. Mantle of M. indica, viewed from the outside, showing the addi- 
tional shell-lobe. 
Fig. 
hoe 
SUR oo 
Do DIS 
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