LAMELLlBRAi^CHIATA OF THE LOWER MARLS. 45 



Farauoxnia lineata. 

 Plate IX, Fig. 10. 



Placunanomia lineata Conrad. J. A. N. Sci., Phil., 2d ser., Vol. lY, p. 291, PI. XLYl, 



Fig. 20. Gabb, Synop., p. 167. 

 Plaeunomia lineata (Con.). Meek, Check-list, p. 6. 

 Paranomia lineata Conrad. Am. Jour. Conch., Vol. Ill, p. 8. Gabb, Synopsis, p. 167. 



J. A. K. Sci., Vol. lY, 2d ser., p. 291. 



A single, apparently imperfect valve, which I have referred to this 

 species, occurs in the collection of Rutgers College. It is much larger 

 than that figured by Mr. Conrad above cited, but very similar in form and 

 identical in surface characters. The form is broadly and irregularly ovate, 

 the shell being very thin and fragile. Surface marked by distant elevated 

 ribs, which are irregular in their direction, rounded, and produced into 

 sharp scattered hollow spines at irregular distances, becoming more distant 

 and larger toward the front of the valve. Spaces between the ribs broad 

 and flattened, and marked by faint irregular concentric lines. On the 

 interior the surface is roughened and radiatingly striate to within a short 

 distance of the margin, where it becomes smooth and porcellaneous in 

 character. Hinge margin imperfect, but the portion preserved is rough- 

 ened, as if for a ligamental surface. 



The specimen is imperfect on the umbo, having probably been broken, 

 though the imperfection looks much as" if it were a natural perforation for 

 the passage of an attaching muscle, as in Anomia. The margin of the open- 

 ino- is thin and sharp, without any appearance of fracture ; still it may have 

 been broken. Neither this or the specimens of the following species pre- 

 sent any of the features upon which the genus was founded; consequently 

 I am not able to judge of the correctness of the generic reference. 



Formation and locality. — From the lower bed of the Lower Green Sand, 

 at Upper Freehold, New Jersey. From the collection of Dr. Bruere. 



Genus PECTEN Klein. 



Pecten vejiustus. 

 Plate VII, Figs. 1-4. 



Pecten venustus Mort. Synopsis, p. 58, PI. Y, Fig. 7. Gabb, Syn. N. A. Cret., p. 161. 



Meek, Check list Smith. Inst., p. 7. Geol. Eept. K J., 1868, p. 725. 

 Chlamys venustus Stoliczka. Pal. Indica, Yol. Ill, p. 429. 



Shell quite small, seldom attaining a height of more than five-eighths 

 of an inch, and not commonly of more than half an inch. Form nearly cir- 



