PSAMMOBIA. 281 



We know of no examples which exceed an inch in 

 length, and about half that measurement in breadth. 



This is decidedly the scarcest of our Fsammobia, and, 

 moreover, one of our rarest bivalves to obtain in a living 

 state. Not that the species is confined to one or two 

 spots, being there gregarious and tolerably plentiful, for, 

 on the contrary, our list of its habitats is tolerably full, 

 but that in no one locality is it taken in abundance, two 

 or three specimens, at the most, rewarding indefatigable 

 research, so that even single valves are not held despicable 

 by any of our collectors. 



Dr. Turton, who first recognized the specific value of its 

 distinctive characters, obtained it at Torbay and in the 

 Channel ; to this locality we may add Exmouth, in deep 

 water, though rarely alive (Clark) ; Port Carnow Cove in 

 Cornwall (Miss Lavers) ; Penzance, in twenty fathoms 

 (M'Andrew and E. F.); St. Peter's Port at Gruernsey in 

 nine fathoms (Metcalfe and Hanley) ; Cork (Humphreys) ; 

 Isle of Skye (Jeffreys and Barlee) ; one living specimen from 

 St. Magnus bay in Zetland (M'Andrew). 



The only recorded foreign locality is Sicily, where it is 

 stated by Dr. Philippi to be one of the scarcer shells. 

 It occurs also on the coast of Greece (Graves and Spratt). 



SPURIOUS. 

 P. Laskeyi, Montagu. 



Tellina Laskeyi, Mont. Test. Brit. Suppl. p. 28, pi. 28, f. 3.— Turt. Conch. 



Diction, p. 173. — Wood, General Conch, p. 179. 

 Psammohia , Turt. Dithyra Brit. p. 89. — Flem. Brit. Anim.p. 433. — 



Brit. Marine Conch, p. 63. — Brown, Illust. Conch. G. B. 



p. 103, pi. 39, f. 32. 



As very little is known of this pretty bivalve, and its presence 

 is rare even in the larger exotic collections, we have been in- 



VOL. I. 



