722 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [June 7, 



covering more especially the angle of the posterior side : margins 

 somewhat rounded in front, with an oblique slope towards the 

 posterior side, curved on the anterior side, and obliquely truncated 

 with an angular and broadish area on the posterior side, where it 

 slightly gapes at the end, dorsal margin gently sloping from the beak 

 on each side, so as to form an obtuse angle : bea/cs small, slightly 

 incurved, placed at a distance of about two fifths from the posterior 

 end : ligament short, prominent, light horn-colour : hinge-line 

 obtusely angular : hinge-plate rather thick and strong, interrupted 

 or discontinued halfway on the posterior side : teeth, in the right 

 valve two short but stout divergent cardinals, that on the posterior 

 side being slightly cloven, besides a short lateral on each side ; in 

 the left valve there are also two cardinals, that on the anterior side 

 being larger than the other and also slightly cloven ; the tooth on 

 the anterior side is slight and curved ; this valve has no lateral 

 tooth : inside highly polished and glossy, exhibiting the longitudinal 

 rays and white lines : pallial and muscular scars conspicuous, the 

 latter large. L. 0-3, B. 0-55. 



'Porcupine' Exp. 1870: Atl. St. C. Sagres. Two perfect spe- 

 cimens and several valves. 



This shell is thinner and more delicate than T. donacina ; and it 

 also differs from that species in the sculpture, colour, and broad 

 posterior angle. It connects Tellina with Psammohia. 



^ 1. PSAMMOBIA FERROENSIS, Chemuitz. 



Tellina ferroensis, Chemn. Conch. -Cab. vi. p. 99, t. 10. f. 91. 

 Psammobia ferroensis, B. C. ii. p. 396 ; v. p. 187, pi. xlii. f. 3. 



'Porcupine' Exp. 1869: St. 13, 18, 25, off Lerwick. 1870 : Atl. 

 C. Sagres, Tangier B. ; Med. Algesiras B., Cartagena B., 50, 55, 

 Benzert Road, Adventure Bank. 



Distribution. Iceland and Finmark to ^gean and Sea of Marmora, 

 Adriatic, Canaries ; 0-90 fms. 



Fossil. Miocene: S.W. France. Upper Tertiaries : Coralline 

 Crag, Belgium, S. France, Italy, Cos, Rhodes. Post-tertiary : 

 Norwaj^, N. England and Ireland, Calabria ; 0-600 ft. 



For synonymy see ' British Conchology.' 



V 2. Psammobia costulata, Turton. 



P. costulata, Turt. Conch. Dith. p. 87, t. 6. f. 8 : B. C. ii. p. 394 ; 

 V. p. 187, pi. xlii. f. 2. 



' Lightning ' Exp; St. 2. 



'Porcupine' Exp. 1869: St. 13. 1870: Atl. C. Sagres, 

 Tangier B. 



Distribution. Norway to the Archipelago, Adriatic, Mogador, 

 Madeira, Canaries ; 0-120 fms. 



Fossil. Upper Tertiaries : Coralline Crag, Italy, Rhodes. Post- 

 tertiary : Calabria. 



A specimen dredged at Oban by Admiral Bedford is more than an 

 inch wide. 



