170. 
Var. 
171. 
172. 
Var. 
173, 
THE MOLLUSCA OF DORSETSHIRE. 45 
R. fulgida (Adams). 
Forbes and Hanley, Vol. iii., p. 129, pl. 75, f.1, 2. Brit. 
Conch., Voi. iv., p. 44. 
Inhabits the Littoral zone. 
Length, the twentieth of an inch, breadth one-third less. 
Extremely rare. 
Weymouth, Jeffreys. 
pallida, Jeff. 
Luiworth, Jeffreys, 
R. semistriata (Afont.) 
Inhabits the Littoral and Laminarian zones. 
Weymouth, Damon. 
R. cingillus (Jont.) 
Forbes and Hanley, Vol. iii., p. 122, pl. 79, f. 9, 10. 
Inhabits the Littoral zone. 
Generally distributed, living between tide-marks, in muddy 
rocky places. 
Swanage, J. LE. Cooper. 
Weymouth, Damon, E. R. Sykes. 
Portland, snow-white, H. R. Sykes. 
Kimmeridge Bay, very abundant, dredged alive, and in shore- 
sand, J. C. M.-P. . 
rupestris, Forbes. 
Weymouth, Damon, E. R. Sykes. 
R. subeylindricata, G. Jeffreys. 
Quarterly Journal Geological Society, Vol. xxxi. (1875), p. 52. 
“ Proceedings” Dorset Natural Histury and Antiquarian Field 
Club, Vol. xvi., p. 173. 
Fossil: Raised Beach, Portland, Prestwich. 
Mr. Gwyn Jeffreys says: ‘I have examined the shells and 
washed shell-sand from the Raised Leach of Portland 
collected by Mr, (Sir Joseph) Prestwich. The shells are 
rather northern than southern, but I have not detected any 
peculiarly arctic species, and certainly none of a Mediter- 
ranean or Lusitanian type. All the species inhabit the 
British coast from Shetland to Yorkshire except one, which 
I consider to be undescribed, and which I propose to name 
Rissoa subcylindracata. 
Mr. E. R. Sykes suggests that this shell is a form of Rissoa 
albella (Lovén.) 
