598 



Records of the Indian Museum. 



[Vol. XXII, 



The outer basal angle is lobate and the basal margin bears at least 

 two narrow inci~ions separating blunt processes. The incisions 

 are sometimes continued upwards on the side of the tooth as ver- 

 tical grooves. The marginals are relatively' small and have four 

 denticulations. The outer cusps are comparatively longer. Their 

 bases are very much reduced. 



Opening into the dorsal portion of the buccal mass are the 

 ducts of the salivary glands. These glands are of irregular shape 



and lie one on each side 

 ,J of the oesophagus. Their 



ducts are slender and, pas- 

 sing underneath the cerebral 

 commissure, open dorsally 

 into the buccal-sac. The 

 oesophagus arises from the 

 dorsal aspect of the mass. 

 Its proximal portion is quite 

 short and muscular, while 

 distallj' it becomes dilated 

 and takes on the structure 

 of the crop. The crop is a 

 long, straight and thin-wall- 

 ed wide tube, filling the 

 greater part of the body 

 cavity. Its distal end is 

 constricted and is in conti- 

 nuity with the bulbous stom- 

 ach. The stomach turns 

 sharply to the left and up- 

 wards. The intestine and 

 the rectum form a narrow 

 tube and lie dorsal to the 

 crop and stomach embedded in the substance of the liver. They 

 form a double loop. The rectum bends down towards the right 

 side and opens by a slit-like opening just under the edge of the 

 mantle, near the middle of the body on the right side. 



The excretory system does not show any peculiarity. The 

 ureter is closely applied to the dorsal surface of the rectum and 

 opens by a separate aperture dorsally to the anus. 



Succinea rutilans, Blanford. 



The range of this species also appears to be restricted. It 

 has so far been recorded only from the Khasi Hills in Assam. 

 During our recent tour in the Manipur Valley it was occasionally 

 found, occurring with the more abundant species S. elegantior, with 

 which it is identical in habits and habitual environment. 



The animal resembles S. elegantior, but its tentacles are less 

 developed and the body is white, spotted with irregular black 

 blotches. A black streak runs on each side of the head extending 

 along the eye- stalks. 



Fig. 24. — Alimentary 

 elegantior, Annandale. 



a. anus ; b.m. buccal mass 

 jaw ; oes. oesophagus ; ; 

 stomach. 



:anal n( Succinea 



c. crop ; 

 rectum ; 



