62 HELICID^E. 



Peristoma dilute olivaceo-fuscuin, callosurn, brevissime reflexum ; 

 marginibus callo elevato junctis, supero subdentato, infero dente 

 quadrate munito. 



" Diam. maj. 25, min. 20, alt. 9 mill." (Brot.} 



Hob. Ceylon (Humbert, Collett) ; Newara Eliya and Watawala 

 (Preston). 



Differs from all other species of Corilla, except charpentieri 

 and beddomece, in being more rounded in outline. From tbe former 

 it is easily distinguished by its smaller size and in being a trifle 

 more excentric, while from the latter it may readily be separated 

 by the rounded whorls. In colour it varies from blackish brown 

 to olivaceous corneous. Nevill * threw some doubt on the cor- 

 rectness of Brot's figure of the species. When studying these 



Fig. 17. Corilla humberti. 



shells in 1896, I applied to Dr. Brot for the loan of his type and 

 he was good enough to comply with my request. I was thereby 

 enabled to confirm Benson's conjecture that the original figure 

 was slightly misleading, as the basal palatal fold appeared to be 

 joined to the suture, owing to the position in which the shell had 

 been placed, but on tilting it from the left side, the fold was found 

 to be quite unconnected with the suture, and I was therefore in a 

 position to give a more correct figure, which is now reproduced. 

 This fold corresponds with the fourth in the other species, while 

 the parietal fold corresponds with the second of the others. An 

 examination of several specimens received subsequently from the 

 late O. Collett and from Mr. Preston, has, however, revealed the 

 fact that the palatal fold is by no means a constant feature, for 

 these specimens, without exception, are devoid of all palatal folds. 

 A few exhibit traces (visible from without) of an immature set of 

 oblique folds on the penultimate whorl, but the folds themselves 

 have been absorbed. 



72. Corilla odontophora, Benson. 



Helix (Corilla) odontophora, Benson, A. M. N. H. ser. 3, xv 



1865, p. 175 ; Nevill, Hand List, i, 1878, p. 70. 

 Helix odontophora, Hanley & Theobald, Conch. Ind. 1870, pi. 57, 



figs. 4-6. 



* A. M. N. H. ser. 7, xyi, 1865, p. 175. 



