﻿110 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 8, 



Ammonites ; fragment of a species nearly allied to A. zignodensis of 



Alcide D'Orbigny. 

 Belemnites Owenii, Pratt. 



Belemnites Beaumontianus, D'Orbigny. This is the B. sulcatus of 

 the Brora lists. 



Turbo ; a muricated species too imperfect for determination. 



Nucula ; remains of two species. 



Pinna mitis, Phillips ? 



Area concinna (Cucullsea, sp.), Phillips. 



Avicula ; species uncertain. 



Gryphsea dilatata, Sow. 



Staffin Estuary Shales. 



Rissoa (Hydrobia) Conulus. Paludina conulus of Robertson. 

 Plate V. fig. 12. 



Shell very minute, conical; whorls five or six, rounded, smooth, the 

 last very large and much broader than the others, occupying rather less 

 than half the length of the shell. I have compared the specimens 

 with those of" Paludina conulus' (Robertson MSS.) from Brora, in the 

 Museum of the Geological Society, and can detect no difference. The 

 Hydrobice are Rissoce, for the most part inhabiting brackish water. 

 The species can be distinguished from each other only with difficulty. 

 This is the unfigured Paludina compared with a Weald Clay species 

 in the list appended to Sir Roderick Murchison's paper in vol. ii. 

 p. 366, Geol. Soc. Trans., Second Series. 



Neritina Staffinensis. Plate V. fig. 13 «, 13 6. 



" Nerita or Neritina, not figured, resembling Woolwich shells." — 

 Geol. Trans, loc. cit. p. 366. 



A minute shell not exceeding three-twelfths of an inch in length, 

 and unfortunately rare and in bad condition. It is smooth, with a 

 body whorl widening and becoming ventricose towards the aperture ; 

 the spire is very short, obsolete, and of few and close volutions. 

 Although so imperfect, it is evidently quite distinct from any described 

 Neritina. I found only two specimens. 



Ostrea Hebridica. Plate V. fig. 4 a, 4 b, 4 c. 



Ostrea with the under valve spatulate, rarely short and subtrian- 

 gular, rather smooth, gently tumid, sometimes highly convex ; upper 

 valve flat, or nearly flat. Length of a large example one inch and 

 three-tenths, and breadth eight-twelfths of an inch. 



This is the "flat species of Ostrea" mentioned in Geol. Trans, loc. 

 cit. p. 366, and there identified with one found with Cyclas media in 

 the Isle of Wight. Being very familiar with the oysters of the Wealden 

 and Purbeck I cannot admit this identification, nor can I refer the 

 Loch Staffin shell to any known fossil, although, as usual in this 

 variable genus, it is difficult to express in words its marked distinc- 

 tions. It is abundant, and from its association with Cyrence appears 

 to have inhabited brackish water. 



