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Records of the Indian Museum. 



[Vol XVI, 



side of the radula. This description does not answer for the jaw, 

 the form of the teeth, or the dental formula of the Siam species, 

 which I identify as Hemiplecta neptuna." Semper alludes to 

 the presence of shell lobes, an important point, the left as being 

 moderately developed, the right well seen: this would place it 

 in Hemiplecta. He put it in Xesta of which citrina is the type, a 

 very different shell and with the generative organs differing, vide 

 plate iii, fig. 13. 





F"iG. I. — Koratia disti)icta (Pfr. ;. 



A. Animal, view of ricflit side, aboiit natural s'vac. 



B. „ . ,^ 



To show different parts, and the position {a) of the right shell lobe (dotted 

 line) had one been present. 



aiif. Idl. anterior left dorsal lobe ; ;'. rectum ; nil. right dorsal lobe ; 

 res. ap. respiratory aperture; I's. visceral sac; sni. vs. sutural margin 

 of visceral sac. 



The animal (text- fig. i A) of this species from Siam has 

 no colour markings, the whole of the foot is ochraceous in spirit 

 and the length of the specimen dissected, not the largest, is 

 45 mm. in its very contracted state. It is evident they were 

 put direct into the spirit, tlie^^ are so shrunken and hardened. 



The sole of the foot is wrinkled in the central area and 

 divided, the peripodial margin is moderately broad and closely 

 segmented or fringed, bounded by a single straight groove above 

 and another irregular zig-zag one above it ; from this close-set 



