282 



PBOCEEDINGS OP THE MALACOLOGICAL SOCIETY. 



straight, not curved. The spiral striation of A. thyraus is completely 

 wanting, as it is also in typical A. cysis. The form of A. cysis 

 figured in the Conch ologia Indica, pi. xxv, fig. 5, and said by Hanley 

 (t.c, Systematic List of Species, p. vii, footnote) to be the variety 

 named Helix ampullaroides by Eeeve, approaches more nearly to 

 A. Daiyi than any other described race, but still differs considerably. 



From A. intumescens the present form may be at once distinguished 

 by its more depressed form, much wider umbilicus, and differently 

 shaped mouth. 



I am indebted to Lieut. -Col. Godwin- Austen for the following notes 

 on the animal : — The generative organs are like those of A. Icevipes,^ 

 only the calc-sac is not so long — it is hardly developed at all. The 

 spermatheca is similar, small and sessile. I^eck lobes as in other 

 species of the genus Ariophanta, the left in two lappets separated by 

 a long interval. The radula has the formula — 



50 : 3 : 17 : 1 

 = 70 : 1 



17 : 3 : 50 

 70 



Ariophanta Dalyi {A. cysis, var.). 



The form of the teeth as in A. ivimerita and A. cysis,^ the laterals 

 aculeate. Typical A. cysis has a greater number of lateral teeth, 

 a Nilgiri radula exhibiting 82 : 1 : 82.^ 



The following is a list of the species of typical sinistrorse Ario- 

 phanta known to occur in the Indian Peninsula, and their authentic 

 localities. 1 have collected six species out of the eight myself. 



Ariophanta Icevipes (Mull.) : syn. Helix trifasciata, Chemn. Bombay 

 and its neighbourhood; Eastern Guzerat. Type of the 

 genus Ariophanta. 



Ariophanta Laidlayana (Bs.). "Western and South-'Westem Bengal. 



Ariophanta Cadapaensis^ JS'ev. : syn. Helix Nicoharica, Mart, and 

 Chemn. Cuddapah (not Mcobar Islands). 



1 Land and Fresh-water Mollusca of India, ii, p. 81, pi. lixi, figs. b-5e. 

 * Op. cit., ii, pi. lixxii, figs. 6, 7. 

 3 Op. cit., i, p. 139. 



