168 MOLLUSCA FROM THE CRAG. 



Spec. Ckar. Testa suborbiculari, convexiusculd, crassd; costis 14 16 converts, rugosis; 

 natibus prominentibus. 



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

 umbones rather prominent. 



Diameter, ^ an inch. 



Localities. Cor. Crag, Sutton. 



Red Crag, Sutton, Newbourn. 



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

 a less number of ribs than either 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. 



CARDITA ANALIS. Phil. Palseont. Beitr., p. 50, t. vii, fig. 6 a c. 

 (?) DUNKERI. Id. t. vii, fig. 7, a c. 



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

 subtuberculatis ; natibus prominentibus. 



Shell suborbicular, slightly depressed, with about 20 convex, rugose, or obsoletely 

 tuberculated costse ; umbones prominent. 



Diameter, f ths 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 rib, and resembling in that character C. chamceformis ; 

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

 more especially in the young state ; they are 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, PJiilippi. Tab. XV, fig. 2 a d. 



CARDITA CORBIS. Phil. En. Moll. Sic., vol. i, p. 55, pi. iv, fig. 19, 1836. 

 Id. vol. ii, p. 41, 1844. 



If Orb. Moll, de Canar., p. 106, No. 183, 1839. 

 Nyst. Add. & la Faune Conch, des Terr. Tert. de Belg. ; Bull. Acad. de 



Brux., t. ix, p. 444, No. 34, 1842. 

 Nyst. Coq. Foss. de Belg., p. 216, pi. xi, fig. 9, 1844. 

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



