168 EOCENE MOLLUSC A. 



8. Crassatella pumilio, S. Wood. PL XXIV, fig. L 



Spec. Char. C. Testa minutissimd, rotundato-trigonuld ; subinaquilaterali ; umbonibus 

 acutis, prominentibus ; lunula minimdy d^pressd, ovatd ; car dine breviy in valvuld dextrd 

 bidentato, in alterd unidentato ; dentibus lateralibus, elongatis ; marginibus integris. 



Shell very small, roundedly triangular, slightly inequilateral ; beaks sharp and rather 

 prominent ; lunule small, ovate, and depressed ; hinge short, with two cardinal teeth in 

 the left valve and one in the right; lateral teeth narrow, elongated; margin smooth. 



Diameter, T^th of an inch. 



Locality. Highcliff', Barton {Edivards). 



Two small specimens exhibiting the interiors of the opposing valves are among the 

 shells kindly sent to me for examination and description by Mr. Edwards, and the card to 

 which they are attached has on it the name of Goodallia trigona, but I think the arrange- 

 ment of the dental furniture corresponds better with the genus in which I have here tem- 

 porarily placed them. The connector appears to have been cartilaginous or internal. The 

 specific name of trigona is preoccupied in this genus, and the above one which I have 

 proposed is more expressive of its diminutive character. It may possibly be the young 

 state of Cr. Bartonensis or some other triangularly formed species, and its present name 

 is merely provisional. 



9. Crassatella sinuosa (?), Lamarck. PI. XXIII, figs. 3 and 9. 



Ceassatella sinuosa (?), Desk. Coq. Foss. des Env. de Par., vol. i, p. 39, pi. v, 



figs. 8, 9, 10, 1824. 



Spec. Char. Cr. " Testa ovato-inflatd antice {?) angulatd, sinuatd, sulcis numerosis 

 irregularibus, lavibus ; margine crenato ; lu?iuld prof undd ovatd." — Deshayes. 



Shell ovately triangular, thick, strong, inequilateral ; pedi-lateral margin rounded, the 

 opposite side angulated, truncated, subsinuated ; pedal region covered with depressed and 

 rather irregular ridges, the other half of the shell nearly smooth, with an obtuse diagonal 

 ridge on the siphonal side, beyond or above which the shell is flattish, with rough lines of 

 growth ; hinge thick and broad ; margins crenulated. 



Length, \\ inch ; height, l^ths inch. 



Localities. Barton and Bracklesham {Edwards). 



France: Chaumont, Calc. gross. [Deshayes). 



There are two specimens in Mr. Edwards's cabinet which appear to correspond with 

 the French shell, but to which I have put a mark of doubt, one from each of the above- 

 named localities. The shell in France is, I believe, not rare, and is subject to consider- 



