1873.] 11 



On the land-shells op Penatstg island, with descriptions oe thb 



ANIMALS AND ANATOMICAL NOTES ; JpaH secoud* HeLICACEA, 



hy Db. F. Stoliczka. 



[Read and received 7tli August, 1872.] 

 (With plates I to III.) 



In this group of pulmoniferous land-shells I shall notice twenty 

 three species, belonging to the Zonitidce, Selicidce^BuUmidce, Clausiliidce, Phi- 

 lomycidcB, PupidoB^ Streptaxidce, VeronicellidcB and Vaginulidce. The majori- 

 ty of the species are new, except a few previously described from the neigh- 

 bouring country, and on one or two of such commonly distributed species, 

 as are Stenogyra gracilis or JEnnea hicolor. 



Nearly all the species had been collected with the animals living, and I 

 have spared no pains in order to make the detailed anatomical account as 

 complete, as it appears desirable for a correct generic determination. 



I scarcely need to mention, that on the whole the fauna is characteristi- 

 cally Malayan, the same fauna which extends from the Philippine islands 

 through Burma and Arakan into the warm valleys of Sikkim. In the plains 

 of Bengal it mixes with the Indian fauna proper. 



I cannot help repeating the urgent request to my conchological friends 

 in India, that they may favour me with live specimens of the species of shells 

 occurring in their neighbourhood. In the Helicacea especially, the anatomical 

 characters are indispensable for a correct generic determination, and without 

 this it will not be possible to obtain a natural arrangement of our terres- 

 trial MoUusca. 



Fam. Zonitidse. 



RHTSOTAf CTMATirM, (Bensofi). PI. i, figs. 1-3 and pi. ii, figs. 13-15. 



Helix Cymatium, Benson, apud Pfeiffer, Novit. Concli. I, p. 58, pi. xvii, figs. 1-2. 



Penang specimens, which slightly differ in the height of the spire, (see 

 figs. 1-3, pi. i,) agree in almost every point of structure with the type shell, 

 described by Pfeiffer from Lancavi, a small island situated a few miles north 

 of Penang. The increase of the volutions is in both exactly the same, the 

 upper side of the whorls is marked with fine oblique rugosities, the lower is 

 spirally striated ; in fresh specimens the former is silky brown, the lower 

 olivaceous brown, the inside of the aperture is in full grown specimens cover- 



* Continued from J. A. S. B., for 1872. Vol. XLI, pt. ii, p. 271. 

 t Albers, HeUceen, edit. E. v. Martens, p. 54. 



