892 MOLLUSCA. 



A broken specimen of four whorls only, long. 67, diam. 47 ; anfract. ult. 44; 

 apert. alt. 28J, lat. 27^ mm. 



A perfect, but not quite adult, specimen (6 wborls), long. 52, diam. 34 ; anfract. 

 ult. 35 J ; apert. alt. 23 mm. 



Pour dead and water-worn specimens of this exceedingly interesting new form 

 were picked up on the shores of Lake Tali, in Yunnan, by the late Mr. Margary, 

 and were given by him to Dr. Anderson, who expressed his desire that the form 

 should be named in honor of his unfortunate companion. 



Genus Paludina, Lamarck. 

 Paltjdina chinensis. Gray, var. ampulliformis, Eyd. et Soul. 



Taludina chinensis, Gray, Griff. An. Kingd., 1834. 



Paludina lecytliis, Bens., Journ. As. Soc, Bengal, vol. v, 1836, p. 745. 



Paludina lecythoides, Bens., Ann. and Mag. Nat. Hist., 1842. 



Fahidina ampuUiformis , Eyd. et Soul., Voy. Bonite., ZooL, 1853, p. 549, pi. xxxi, figs. 25 — 27. 



Paludina lecytliis , Bens., var. ampiilliformis, Con. Indica, pi. ixxvi, fig. 7. 



Paludina chinensis, var. ampulliformis, Nevill, I. c, p. 31. 



The types of Benson's P. lecytUs are in the Indian Museum ; they are a very 

 large, globose, and thin form of P. chinensis. PI. Ixx^d, fig. 6, in the ' Con. Indica' 

 fairly represents Benson's form; this variety has been recently rediscovered in 

 India by Lieutenant- Colonel Godwin- Austen, who found it at Manipur ; Benson's 

 types of P. lecytUs were more probably found in the same locality, than in Sylhet 

 proper. 



Pound in great abundance, about 5,000 feet above the sea, at Nantin, Mungla, 

 Momien, and Hotha, in Yunnan. There are two forms existing everywhere together, 

 which pass by insensible gradations the one into the other : one is a short tumid 

 variety, like typical P. lecytUs, but of stouter texture and with the whorls much 

 more distinctly angulate, appearing to me to be the form called P. ampulUformis by 

 Souleyet : the other has a more produced spire, resembling that of P. lecythoides ; 

 apparently both Yunnan forms can be distinguished from specimens from other 

 parts of China by the markedly shorter last whorl ; some one or two, however, 

 show in this respect so close an approach to var. lecythoides, that I am afraid the 

 character cannot be relied upon to separate P. chinensis and its var. lecythoides 

 from var. lecythis and var. ampulUformis. 



Paludina dissimilis, MiilL, var. dectjssatijla, Blanf. 



P. dissimilis, var. decussatula (vel. P. decnssattda) , Blanf., Proc. Zool. Soc, 1869, p. 445 • Nevill 

 I. c, p. 31. ' ' 



Differs from P. heliciformis, v. Pr., by the less rounded whorls, by the more 

 produced and not decollated sphe, and by the less distinct angulation at the peri- 

 phery, which is distinctly banded with a white belt, obsolete in the Pegu form. 



