CORILLA.. PLECTOPYLIS. 69 



and lower folds. In fig. 26 two immature specimens are de- 

 lineated, of which a-e exhibit one with four whorls completed, 

 having five immature palatal plates. In fig. 26 e and / the daggei 

 indicates the place where the barriers occur, in the former at the 

 end of the fourth whorl and in the latter where only 3| whorls 

 have been completed. I also possess one specimen of 2 j whorls 

 which is provided with a set of barriers at the end. of 2| whorls, 

 distant about \ whorl from the nepionic shell. Except in size 

 these barriers do not differ from those in the other immature 

 shells. 



76. Gorilla colletti, SyJces. 



Corilla colletti, Sykes, Proc. Malac. Soc. London, ii, 1897, p. 233, 

 pi. 16, figs. 11-13. 



Original description: " Shape strongly recalling that of C.rivolii, 

 but the new species is much smaller in size. Sculpture also 

 similar in nature, but finer and more closely set. The mouth in 

 the present species not so much contracted and not quite so 

 descending ; the lip not nearly so reflexed and thickened. The 

 palatal and parietal lamellae are the same in number in both 

 species, but in C. colletti the former approach more nearly to the 

 lip, especially the upper two. Of the parietal lamellae, the upper 

 and lower are more nearly parallel, and not so convergent, while 

 the middle one is much shorter than in C. rivolii, and does not 

 enter so far iuto the shell. 



" Long. 21-21-25, lat. 14-15-5, alt. 6-5-75 mm." (Syl-es.) 



Hob. Ceylon : Balangoda (Collett). 



Genus PLECTOPYLIS, Benson. 



Plectopylis (section of Helix), Benson, A. M. N. H. ser. 3, v, 1860, 

 p. 244 ; Stoliczka, J. A. S. B. xl, 1871, p. 217 ; Pilsbry, Man. 

 Conch, ser. 2, ix, 1894, p. 143 ; Gude, Science Gossip, N. s. vi, 

 1899, pp. 147, 174; Godwin- Austen, Moll. India, ii, 1907, p. 201. 



Type, Helix achatina (Gray). Pfeiffer [bensoni, Gude]. 



Range. N.E. India, Burma, Tonkin, South and Central China, 

 and Loo Choo Archipelago. 



" Shell depressed, with flat or low-conical spire and large 

 umbilicus, dextral or sinistral ; solid or thin, the upper surface 

 generally sculptured with spiral lines, hirsute in the young. 

 Aperture half-round or lunate, oblique, the lip reflexed, its end 

 generally joined by an elevated parietal callus, which usually 

 bears an entering lamella. Interior of the last whorl obstructed 

 by a barrier composed of a transverse plate or plates on tlie parietal 

 wall, and several transverse or longitudinal denticles or plates on 

 the outer wall. 



" Foot short, rarely equalling in length the diameter of the 



