736 LIEUT.-COL. GODWIN-AUSTEN AND MR. NEVILL ON [Dec. 2, 



common in similar ground in the nearest known countries, Tenasserim 

 and Penang." 



I have deemed it best, considering that only two specimens were 

 found, and that they are so similar in general form to immature spe- 

 cimens of Ennea stenopylis, Bs., from the Khasi hills, not to found 

 this new subgenus until further examples are obtained proving that 

 the shell as given in the Plate is a mature form ; and I trust Mr. 

 Nevill will pardon this caution on my part (G.-A.). 



Nanina (Microcystina) townsendiana, n. sp. (Plate LIX. 

 fig. 1.) 



Testa minutissima, N. minimse (H. Adams, P. Z. S. 1869), a me 

 detects, affinis ; vix rimata, planiuscula, vitrea, nitida et Icevis ; 

 anfract. 4|, perlente crescentes, sutura impressa sejuncti, ultimo 

 majore, prope aperturam vix dilatato, ad peripheriam rotundato, 

 basi convexiusculo ; apertura minima, angusta, margine columellari 

 perobliquo vix descendente. 

 Alt. 1 (prox.), diam. 1 (prox.) mill. (G. N.) 

 A small and almost microscopic form, which I obtained by washing 

 larger shells found by Dr. Townsend in the Buket Pondong Cave. 

 It belongs to a group which appears to me to abound nearly every- 

 where in the Indo-Malay Province, but which has hitherto been 

 almost universally neglected, on account of the small size, and ab- 

 sence of marked sculpture and coloration, which characterize these 

 shells. Species have nevertheless been described by MM. Issel 

 (from Borneo), Martens, Semper, and Mb'rch (Eastern Archipelago), 

 Benson (India and Burma), Morelet and H. Adams (Mascarene I.), 

 &c. I have not any books by me for reference ; but I am almost 

 confident that it was for a species of this group that Morch, Journ. 

 de Conchyl. for 1872, formed a new subgenus "Microcystina" (as 

 distinct from the sculptured Microcystis, of Beck), with N. rinkii, 

 Morch, from the Nicobar Islands, as his type ! Microcystina seems 

 to me to bear somewhat the same relationship to the larger and closely 

 allied mollusks known as Macrochlamys, that the European species 

 of Vitrea (of Fitzinger) do to Hyalina (G. N.). 



M. Crosse has described ' a new form from the same locality, II. 

 (Geotrochus) perakensis. 



Clatjsilia? juv. (Plate LIX. fig. 8.) 



Another young shell figured, which I doubtfully refer to the 

 above genus (G.-A.). 



Perak. (Indian Museum, Calcutta.) 



Pupisoma? sp. juv. (Plate LIX. fig. 7.) 



This shell I have figured although young, it being often of impor- 

 tance to know the immature forms, which so puzzle a conchologist 

 when sorting out a collection. It probably belongs to the above 

 subgenus of Stoliczka (J. A. S. B. 1873, p. 32). 



Alt. -045 inch. (G.-A.) 



Perak. (Indian Museum, Calcutta.) 



1 Journ. de Conchyl. t. xix. p. 199, pi. viii. f. 4. 



