92 



SCIENCE-GOSSIP. 



erronea and Gorilla fryae they form a semicircle, the 

 second fold being nearest the aperture. The shell 

 of Gorilla odontophora is more regularly and less 

 coarsely ribbed than that of Gorilla erronea, and 

 larger, although composed of only 4-4^ whorls, 

 while the other two species have 5 whorls ; it 

 differs further from Gorilla erronea in that the last 

 whorl is more deflected in front, more 

 tumid, and then suddenly contracted 

 behind the peristome, more resem- 

 bling Gorilla fryae in these respects, as 

 also in the presence of a quadrate 

 tooth on the basal margin of the 

 peristome. Before concluding the 

 consideration of this species, I would 

 draw attention to fig. loa, in which, 

 though the shell is adult, is seen 

 the immature form of palatal folds 

 immediately behind the callus of the mouth, and, 

 -as already mentioned, a circumstance which shows 

 that the earlier folds are not invariably absorbed 

 ■on the completion of the shell. 



Gorilla humberti, also Cingalese, is extremely rare 

 in collections. As Benson, in the paper cited above, 

 throws some doubt on the correctness of Dr. 

 Brot's figure of this species in the "Journal de 

 Conchyliologie," xii., 1864, t. 2, f. 6, I was pleased 

 to be able to give a new figure of it, and I am in a 



Fig. II. — Ccrilla humberti 



position to confirm Benson's conjecture that the 

 original figure is slightly misleading, as the basal 

 palatal fold appears to be joined to the suture 

 owing to the position in which the specimen was 

 placed, but on tilting the shell from the left side 

 the fold is plainly seen to be unconnected with the 

 suture, and it is thus shown in my fig. 11 ; this fold 

 corresponds in position with No. 4 of 

 the other species, while the parietal 

 fold corresponds with No. 2 of the 

 others. The specimen having been 

 completely cut in half through the 

 median plane, a close examination 

 of the parietal fold reveals a slight 

 fracture, and the inference forces 

 itself upon my mind that, probably, 

 in the process of cutting, it was 

 partly cut away, and that it reached 

 further back than it now appears. This form 

 differs from the species already considered in 

 having only one palatal and one parietal fold ; 

 it is also decidedly more rounded in outline, but 

 like Gorilla odontophora and Gorilla fryae, it has a 

 quadrate, but less elongate, tooth on the basal 

 margin of the peristome. 



The other species of Gorilla will be considered in 

 a future communication, 



[To be continued.) 



