168 MOLLUSCA FROM THE CRAG. 



Spec. Char. Testa suborbiculari, convexiusculd, crassd; costis 14 — 16 convexis, ruffosis; 

 natibus prominentibus. 



Shell suborhicular, slightly convex, thick; with 14 — 16 rugose and convex ribs, 

 umbones rather prominent. 



Diameter, h an inch. 



Localities. Cor. Crag, Sutton. 



Red Crag, Sutton, Newbourn. 



This shell is not very abundant in ray cabinet. It has a more elevated umbo and 

 a less number of ribs than cither of the preceding species ; the form of the hinge as 

 well as the muscle marks being the same in all, only varying a little in conformity 

 with the varying outline of the shell. The ribs in my specimens are somewhat distant, 

 more rounded, and less nodulous than in C. scalaris, less distant than in C. orbicularis. 



5. Cardita analis ? Phil. Tab. XV, fig. 6. 



Cakdit.v an.\lis. Ptiil. Palacont. Beitr., p. 50, t. vii, fig. G a — c 

 (?) — DrxKEUi. Id. „ „ t. vii, fig. 7, a — c. 



Spec. Char. Testa suborbiculari, depressiusculd, costis circa 20 convexis, miosis vel 

 subtuberctdatis ; natibus prominentibus. 



Shell suborhicular, slightly depressed, with about 20 convex, rugose, or obsolctely 

 tubcrculatcd costte ; umbones prominent. 



Diameter, fths of an inch. 



Locality. Mam. Crag, Bridlington. 



This species appears to be peculiar to the more recent Formation at Bridlington, 

 differing in some degree from all my Red or Coralline Crag specimens of this genus, 

 in having the depressed form of ril), and resembling in that character C. chamcpformis ,- 

 but they arc more numerous, being from 20 to 24 in number, and somewhat nodulous, 

 more especially in the young state ; they arc not so prominent or distinct, the con- 

 centric striae being more numerous, and not deeply impressed, so as to separate the 

 shell into nodules, and there appears also to be a larger anterior muscle mark, ex- 

 tending more into the shell ; my series of this species is not very extensive, and I am 

 unable to say if these characters be permanent. 



6. Cardita corbis, Philippi. Tab. XV, fig. la — d. 



Cardita cordis. Pliil. En. Moll. Sic, vol. i, p. 55, pi. iv, fig. 19, 183(i. 



— — Id. „ vol. ii, p. 41, 1844. 



— — B'Orb. Moll, de Canar., p. 10(), No. 183, 1839. 



— — Nyst. Add. k la Faunc Conch, des Terr. Tert. de Belg. ; Bull. Acad, de 



Brux., t. i.\, p. 444, No. 34, 1842. 



— — Ni/.it. Coq. Foss. de Belg., p. '2 Hi, pi. .vi, fig. 9, 1844. 



— — Forbes. Geol. Survey, vol. i, p. 415, 1846. 



