ZONITIDiE. 



25 



Family ZONlTlDiE. 

 Subfamily ARIOPHANTIN.E. 



[The Ariophantiiue form a very distinct subfamily of the Indian 

 Mollusca, and are almost exclusively confined to the Peninsular 

 area and Ceylon ; only two species are found extending a short 

 distance northward into the Gaugetic delta, but have not been 

 recorded from that of the Brahmaputra Eiver. The largest Indian 



Fio-. 16. — Afiophanfa Icsvipes. 



A. Genitalia. X 3. 



B. Ditto, part of, .showing spermatheca. . ■,■ e 

 0. Portion of male organ near juncLion of vas deferens, showing position ot a 



sperniatophore. 

 D. Terminal end of the amatorial organ or dart. 



J). Penis. 

 rm. Retractor muscle. 



rmp. Eetractor muscle of penis. 

 sp. Spermatheca. 

 V. Vagina. 

 vd. Vas deferens. 



am.or. Amatorial organ or dart. 

 crp. CcBcum musculi retradoris 

 penis of Semper. 

 d. Dart. 

 gen.ap. Generative aperture. 

 k. Kale-sac. 

 ov. Oviduct. 



land-shells belong to this subfamily. All are large and fine forms, 

 both sinistral and dextral ; they vary much in form from solid, 

 turbinate, to thin and very globose shells, and to others Ifehcanon- 

 like, thin, diaphanous, and membranaceous. 



The generative organs have three marked characters, viz., the 

 penis ciEcum (" cjecum musculi retractoris penis " of Semper), 

 to which the retractor muscle is attached; a very small pear- 



