﻿ROTELIiA.— Plate IV. 



Species 10. (Fig. a, b, Mus. Brit.) 



RoTELLA sonRiN.i. Bot. testd minutd, planorhulari, 



iMmpressd, alba, opacd ; infra umbilicatd, anfrac- 



tibus rotundis. 

 The related Rotella. Shell miuute, planorbular, 



compressed, white, opaque ; umbilicated below, 



whorls rounded. 

 A. Adams. (Ethalia), Ami. of Kat. Hist. 18G1, Vol. 



VIII. 30(5. 



Species 20. (Mus. Brit.) 

 Rotella tkihibata. Bot. testd pallide griseo-oUvctced, 

 suhdepressd, ■maculis strigisqiio varie pictd ; an- 

 fractibus siiperne convexiusculis ; umbilico mfv.ndu 



luUformi ; callo parvo in partes tres semicircu- 

 lares divlso. 

 The trilobate Rotella. Shell pale grey-olive, sub- 

 depressed, variously painted with spots and 

 stripes ; whorls rather convex above ; umbilicus 

 funnel-shaped ; callus small, divided into three 

 semicircular parts. 



SOWEUET. 



Uab. ? 



In this species, the form of the callus is very pe- 

 culiar, resembling that of B. siriolata, but more 

 pronounced in character. In rotundity of whorls 

 the species is midway between the latter and B. Gua- 



