122 PYRAMIDELLIDjE. 



and in the laminarian zone, on various parts of our coast 

 from Guernsey to Shetland. Fossil in the boulder-clay 

 of Caithness (Peach), and at Uddevalla, 40 feet above 

 the sea-level (Malm) ; post-glacial shell-bank at Kir- 

 koen, Norway, 50 feet (Sars, as O. plicata, Malm). 

 Living in Norway (M f Andrew, Sars, and others), Sweden 

 (Loven and Malm), coasts of Denmark (mus. Copenh.), 

 La Hougue Bay, near Cherbourg (Mace), Loire-Infe- 

 rieure (Cailliaud), Sardinia (Verany) ; Cailliaud gives 

 the laminarian zone, Sars 10-40 f., and Danielssen 

 30-40 f. as the range of depth. 



In Shetland and the Hebrides it lives between tide- 

 marks in company with Rissoa striata and R. cingillus ; 

 it floats in a supine position, like its neighbours. At 

 Guernsey and Filey I found this species in the same 

 spot as 0. rissoides. When scalded, the colour of the 

 animal becomes bright orange. Owing to Mr. Clark 

 having included in his description not only the present 

 species, but also O. rissoides and pallida, with their 

 varieties, I have been unable to make any use of it, and 

 therefore rely on my own notes as to the soft parts. 



7. O. RISSOI'DES *,(Hanley} 



rissoides, Hani, in Proc. Zool. Soc. pt. xii. p. 18 ; F. & H. iii. p. 284, 

 pi. xcvi. f. 4, and xciv. f. 7 (as 0. nitida, var. ?). 



SHELL conic-oblong inclining to oval, thin, transparent, and 

 glossy : sculpture, microscopical only, and consisting of very 

 fine and numerous, but irregular and scratch-like strise in the 

 line of growth, besides still finer and less distinct spiral striae : 

 colour pale yellowish -white or whitish: spire turreted, and 

 tapering to a blunt point ; the nucleus is concealed : whorls 5, 

 convex, rapidly enlarging ; the last occupies two-thirds of the 

 shell : suture rather deep ; in living or fresh specimens the 

 dark spiral band noticed in other species is observable below 

 the suture on the top of each whorl : mouth regularly oval, 



* Having the aspect of a Rissoa. 



