44 



LAND AND FRESHWATER 



EXPLANATION OF PLATE LXV. 



Fig. 1,1a. Di-plommatina dnhertyl, G.-A. 



2, 2 a. • thomsoni, G.-A. 



3, 3 a. nengloensis, G.-A. 



4, 4 a, 4 b. dhfincta, G.-A. 



5, khunhoenais, G.-A. 



6, 6 a. lupiUus, G.-A. 



7, 7 a. compacta, G.-A. 



7 6. ■ compacta, G.-A. 



8, 8 a. jatlngana, G.-A. 



Margarita, Eastern Assam. 

 Sf>utli Burrail Range. 

 North Cacbar Hills. 

 North of" Burrail Range. 

 Khunho Peak, Naga Hills. 

 Lahupa Naga Hills. 

 Miinipur Hills. 

 Asalu, North Cachar Hills. 

 North Cachar Hills. 



EXPLANATION OF PLATE LXVI. 



Fig. 



EXPLANATION OF PLATE LXVII. 



Fig. 1. 0/op<:r/?ia naticoides, Recluz, J, X 1'2. Socotra. 



1 a. Ditto : removed from shell, right side. 



1 b. Ditto: viewed from front, showing divided foot, X 211 



2. Ditto: branchial chamber with sides removed, showing position of 



the male organ and rectum, X 1'4. 

 2a. Ditto: the same parts further enlarged, showing the anal aperture, 

 X 4-5. 



2 /). Ditto : the lower side of male organ showing the sperm-opening. 



3. Ditto, $ : showing the anal aperture and position of female orifice 



Lf-or.). 



4. Ditto : part of radula, X 58. 



4 a. Ditto : first tooth on right side, X 163. 



4 b. Ditto: second and third leeth on right side, X 163. 



5. Ditto : buccal mass viewed from left side, X 4-5. 



f) a. Ditto : buccal mass viewed from below, showing the salivary glands. 

 (). Otopoma clathratidum, Recluz, var. minor, G.-A., X 4'5. Socotra. 



Animal from spirit-spciimcn, right side view, showing the po.sition 



of the penis. 



P., penis; An., anus; o., opei'culum ; An.or . anal orifice; f.or., female 

 orifice; t., tentacula ; P.ap., penis aperture; r.m., retractor muscle; 

 sal.gld., salivary gland. 



