o 



(36 



One valve of tliis curious rncil has as yet only come' 

 under inTpedion ; we found it in fand from Salcomb bay : 

 it was recent, and as clear and pellucid as the Bulla 

 aperta ; beir^g very flat, has the appearance of a fcale of 

 a fiOi. Lens^tli three eijrhths of an inch ; breadth half 

 an inch. 



The hinge does not appear to ftrictly belong to any 

 of the Linncean genera, but feems to be mofl nearly al- 

 lied to the Solen, which has induced us to give it a place 

 as fuch, for the prefent. 



PiwNA. S. with a thin, pellucid, fragile, depreffed, white fhel!. 



Tab. 15, f. 3. of a fub-oval (hape, ftrongly wrinkled concentrically : 

 umbo fmall, placed very near the fmaller end, from' 

 whence the connefting cartilage runs in a ftraight line 

 on the longed fide, and joins the valves nearly the whole 

 width of the (hell, like a Pinna; the fhort end declines 

 a little from the beak; the margin oppofite the hinge is 

 femi-circular, and extremely thin and brittle; the valves 

 are diflTimilar, the upper is a little convex, the lower 

 ilightly concave. 



Infide white, fomewhat pearlaceous: a blunt tooth in 

 each valve running flraight from the beak ; that in the 

 concave valve is larged, and uneven on its furface ; thefe 

 are not inferted, but (land by the fide of each other v/hen 

 the valves are clofed. 



Length 



