11 



TKOCKEDINGS OF THE MALACOLOGICAL SOCIETY. 



posteriorly by a septal surface, of which the ventro-clorsal diameter 

 (= height of the whorl) is 6 mm., and the transverse (= thickness 

 of the whorl) 8 mm., displaying the small internal (or dorsal) lobe, 

 and the siphuncle at about two-fifths of the height of the whorl 

 below the periphery. The specimen belonged to the collection of tlie 

 late Mr. G. H. Morton, F.G.S., and is stated to be from the "Mill- 

 stone Grit " of Hebden Bridge, Yorkshire. 



Figs. A, B, C, B. 



ililli'lHll'llllili ML T / 





m 



a i ■ C 



Vestinautilus cariniferus, J. de C. Sowerby, sp., from the Carboniferous Limestone, 

 Cork, Ireland. — A. Ventral or peripheral aspect of the internal cast of the 

 posterior portion of the body-chamber (nat. size), showing at m, in the 

 impression of the muscular attachment {m in all the other figures has the same 

 meaning) ; p in all the figures refers to the pitted and rugose surface of the 

 muscular impression. B. Dorsal (internal) aspect of the same fragment ; 

 f , test ; il, internal or dorsal lobe of a septum. C. Lateral aspect of the 

 internal cast of the posterior portion of the body-chamber of a larger 

 specimen ; t, test ; gr, groove ; si, siphuncle. B. Eeduced figure of a nearly 

 perfect example of this species, from Avhich the fragment lettered A and B 

 was removed. (After Foord & Crick.) Eeproduced by permission of the 

 Trustees of the British Museum. 



Dr. Wheelton Hind's examples are 17-5 and 27mm. in diameter 

 respectively. The smaller specimen is immature (PI. II, Fig. 5) ; 

 it consists of one and a half whorls, the body-chamber occupying 

 nearly one-half of the outer whorl. The inner whorl is remarkably 

 well pi-eserved, and shows the ornaments of the test of the nepionic 



