MOLLUSCA OF INDIA. 143 



EXPLANATION OF PLATE XCI. 



Austenia gurhvjalensis, n. sp. Gurh\val. 



Fig. 1. Shell, front view, X 2-4. 



1 a. Ditto, froQi above, X 2--4. 



1 6. Sculpture of, on body-whorl, X 58. 



1 c. Jaw, X 8. 



1 d. Central teeth of radula, X 368. 



1 c. 22nd, 23rd, and 24th median teeth, X 368. 



1/ 26th, 27th, and 28th lateral teeth, X 368. 



1 g. Outermost laterals, X 368. 



1 h. The amatorial organ, X 4. 



Austenia paurhiensis, n. sp. Gurhwal. 



Shell, front view, X 2-4. 



Ditto, from above, X 24. 



Animal with shell removed, right aide, showing mantle-lobes, X 4. 



Ditto, left side, showing mantle-lobes, X 4. 



Amienia shanensis, n. sp. Shan States. 



Shell, from above, X 2'4. 



Ditto, from below, X 2'4. 



Animal from right side, portion only well preserved, X 2. 



Spermatophores, X 8. 



Lateral teeth of radula, X 368. 



Outside laterals, X 368. 



Austenia planospira, Bs. Sikkim. 

 Fig. 4. Anterior end of the amatorial organ, X 12. 



EXPLANATION OF PLA.TE XCII. 



Microcystina Ufa, Sykes. Ceylon. 

 Fig. 1. Shell, from type, X 8. 



1 a. Surface of shell, X 68. s, suture. 

 1 6. The spiral of the whorls, X 4'0. 



1 c. The columellar margin and umbilical region, X 24. 



Microcystina lita, juv. Ceylon. 

 Fig. 2. Shell, X 8. 



2«. Surface of shell, X 58. 



2 6. The spiral of the whorls, X 4"5. 



2 c. The umbilical region, showing columella, X 24. 



Microcystina perfucata, Bs., var. bintennensis. Bintenue, Ceylou. 



Fig. 3. Shell, X 4-5. 



3 a. Surface of shell, X 58. 



3 6. The umbilicus and columellar margin, X 24. 



3 c. Animal, shell removed, showing foot and dorsal lobes, X 8. 



3 d. Right shell- and dorsal lobes, X 24. 



3 e. Left dorsal lobes, X 24. 



3/. Side view of foot, X 12. 



3^. The male organ, X 24. 



3 h. Ditto, under pressure in transmitted light, X 58. 



3 i. Buccal mass of intestine and salivary glands, X 12. 



Microcystina perfucata, Benson. 

 Fig. 4. Columella, X 24. 



PAKT IX. 



