CORILLA. 57 



unique as being devoid of barriers in the mature shell. When 

 publishing my series of articles on the Armature of Helicoid 

 Land-shells in Science Gossip, w. s. vol. iii, 1896, et seq. I simply 

 recorded that Cor ilia charpentieri \_G. adamsi] was devoid of 

 armature (torn. cit. p. 88). I was not then aware of the remark- 

 able fact that this statement only applies to full-grown shells and 

 that at earlier stages the species is furnished with palatal laminae 

 similar to those found in immature shells of the other species of 

 Gorilla, except that they are less oblique and consequently less 

 overlapping. Among a number of shells I received in 1896 from 

 the late O. Collett and subsequently from Mr. H. B. Preston, 

 were several specimens of Gorilla adamsi in various stages of 

 growth, and upon opening some of the latter I was astonished to 

 discover the palatal barriers. These occurred in specimens which 

 had only four whorls, others possessed them where 4| whorls had 

 been completed, while some had two sets of barriers, in one of 

 which the earlier set had been partly absorbed. 



Apart from the absence of barriers in mature shells, Gorilla 

 adamsi is readily distinguished from all its congeners by its more 

 rounded outline, its higher axis, the regular and coarser ribs. In 

 colour it varies from pale corneous to dark chestnut. 



Owing to the fact that Helix charpentieri of Scholtz (1843) 

 antedates Pfeiffer's name (1853) I have been reluctantly compelled 

 to change the latter. I have associated with the species the 

 name of the brothers Adams who proposed the name Gorilla. 



Var. hinidunensis, Nevill. 



Gorilla hinidunensis, Nevill, Enum. Helic. Pneura. Ceylon, 1871, 



p. 1. 

 Gorilla charpentieri, var. hinidunensis, Pilsbry, Man. Conch, ser. 2, 



ix, 1894, p. 148, pi. 41, figs. 23-25; Gude, "Science Gossip, N. s. 



iii, 1896, p. 127, fig. 15. 



Fig. 13. Gorilla adamsi, var. hinidunensis. 



The late Col. Beddome favoured me with the loan of a specimen 

 received from Nevill, for the purpose of illustration. This speci- 

 men is here reproduced. It measures 22 millim. in diameter. 



68. Gorilla beddomese, Hanley. 



Helix (Plectopylis} beddomece, Hanley, Conch. Ind. 1875, p. 60 (no 



description), pi. ]50, figs. 1, 2. 

 Plectopylis beddomei, Pilsbry, Man. Conch, sev. 2, ix, Index, 1895, 



p. 121. 

 Gorilla beddomece, Gude, Science Gossip, N. s. iii, 1896, p. 127, 



figs. 13, 14. 



