CINGULA PENTODONTA. 637 



clays only. The specimen now fig'nred has been kindly lent by Mr. Deane, the 

 curator of the Public Art Gallery and Museum of that city. As a Continental 

 fossil it is reported from the post-glacial l)anks of the Christiania fiord and from 

 the Pleistocene deposits of the Mediterranean region. 



The sub-genus Pemephona is used for species of Bisnoa having finely punctuated 

 sculpture, of which B. violacea has been taken as the type. 



Gemix CINGULA, Fleming, 1828. 



Cingula pentodonta (S. V. Wood, Jr., MS.), Kendall and R. G. Bell. Plate LT, 



fig. 34. 



1886. Rissoa pentoclonia, S. V. Wood, Jr., iu Kendall and R. Gr. Bell, Quart. Jouru. Greol. Soc., vol. 



xlii, p. 211. 

 1893-98. Rissoa pentodonta and vars., A. Bell, Proc. Roy. Irisli Acad. [3J, vol. ii, p. 630, 1893 ; Trans. 



Roy. Greol. Soc. Cornwall, vol. xii, p. 152, pi. ii, fig. 13, 1898. 



Specific Gharacfers. — Shell small, smooth, conically ovate; spire short, apex 

 blunt ; whorls 6 — 7, ornamented with horizontal bands ; mouth ovate to round ; 

 pillar lip well developed; outer lip furnished internally with five teeth ; umbilical 

 chink well marked (A. Bell). 



Dimensions. — L. 5 mm. B. 2 mm. 



Distribnfioji. — Not known living. 

 Fossil : St. Erth. 



Bemarls. — This small species was first recognised and named but not 

 described or figured by S. V. Wood, Jr., in a pi-eliminary list accompanying a paper 

 read before the Geological Society in November, 1884. As he hoped largely to 

 add to the number of species he withdrew this for further investigation. At 

 Wood's death, which took place in December of the same year, his collection of 

 St. Erth fossils, together with his notes and the list referred to, was handed over 

 to the late R. G. Bell, who, in a subsequent paper by himself and Mr. (now Prof.) 

 P. F. Kendall, published in 1886, adopted some of Wood's names, the present 

 among them. 



In addition to the latter investigators, Messrs. E. T. Newton, Keeping and 

 Alfred Bell collected from St. Erth, the results being placed in the Museums at 

 South Kensington, Jermyn Street, Cambridge and elsewhere, all of the specimens 

 being afterwards re-examined by the latter. Much more may be found by further 

 work at this most interesting and important locality, which contains a molluscan 

 fauna of a type different from that of any other of the fossiliferous deposits of 

 Great Britain, or, so far as I know at present, of the Continent. 



B.pcnfodonfa is specially characterised by five well-marked denticulations inside 

 the outer lip — a feature peculiar to it — and by its well-marked umbilical chink. 



83 



