376 Mr. Broderip and Mr. G. B. Sowerby on some 



The habit of this shell is not unhke that of B. undatum : but it 

 differs from it in many points, especially in the form of the aperture and 

 thinness of the shell. In young specimens the epidermis is so strong, 

 that, in drying, it breaks the delicate edge ©f the lip. From Kamts- 

 chatka. 



COLUMBELLA COSTELLATA. 



C. testa oblongd, acuminata, anfractibus subventricosis, costellatis ; cpi- 

 dermide fused, slriatd, nitente ; long. -^q, lat. -^g, poll. 

 Hab. 



Two varieties of this Columbella have occurred, differing, however, 

 only in the more or less acuminated form of the spire and in the close- 

 ness of the ribs. They are of a light colour, with dark brown specks 

 and bands. 



Nassa luteostoma. 



.AC testd oblongo-acuminatd, anfractibus tuberculato-costatis, aperturd 

 croceid ; long. i;l, lat. -^^, poll. 

 Hab. 



Shell of a dark colour, almost black. The aperture in full-grown 

 specimens is of a bright saffron colour ; the young shells, however, 

 have their lips much paler. 



RiCINULA ELEGANS. 



R. testd obovatd, albidd, spinis subulatis muricatd, prope marginem 

 longioribus ; aperturd ringente, albd, lined castaned concinne cir- 

 cumdatd ; long, -^-q, lat. -j^, poll. 

 Hab. 



This species very closely resembles R. arachnoidea, but is beautifully 

 distinguished by a bright chesnut coloured line surrounding the aperture 

 just within the margin. Very few specimens occurred ; and we have 

 since found a single individual among the stores of the late G. Humphrey. 



Ran ELLA NANA. 



R. testd ovato-acutd, sub-compressd, muricatd, anfractu basali albo- 

 fasciatd ; brunned, lineis castaneis transversis varid ; labia subfo- 



