LAMELLIBBANCHIATA OF THE LOWER MAELS. 61 



Genus PLICATULA Lam. 



Plicatula urticosa. 



Plate IX, Figs. 1 and 2. 



Ostrea urticosa^ Morton. Synop., 1st ed. 



FUcatula urticosa^ Morton. Synop., p. G2, PI. X, Fig. 2. Am. Jour. Sci.yVol. XXIY, 1st 



ser., PI. X, Fig. 2. Gabb, Synop., p. 169. Meek, Check-List, p. 7. Geol. 



Surv. N. J., 1868, p. 724. Stoliczka and others. 



Shell irregularly oval in outline and obliquely curved, biconvex or 

 plano-convex, marked by strong, somewhat angular radiating and bifur- 

 cating plications, usually much stronger and less numerous on the lower 

 than on the upper valve, and crossed by strong projecting concentric 

 lamella, which are elevated and often form thin, flat spines on the crest of 

 the radiating plications of greater or less length, which give a very rough 

 and spiney surface to the shell, resembling that of Spondylus, Muscular 

 impression moderate; teeth not observed. 



On some internal casts from Freehold the muscular scar is quite large, 

 and, so far as can be judged, the teeth have been quite small. The shell 

 appears to have been quite abundant, and to have grown in groups, attached 

 to each other or to foreign bodies. On the Alabama specimens, and on 

 some of those from New Jersey, there are indistinct radiating striae between 

 the plications. The largest individuals which I have observed are casts, 

 one of which is one inch and five-eighths long and of a broadly-ovate form. 



Formation and locality, — In the Lower Green Marls at Freehold and 

 Holmdel, N. J. The type specimens of Dr. Morton in the collection of the 

 Academy of Natural Sciences, Philadelphia, are without locality, being 

 marked ^^ Lower Cretaceous, N. Jersey" only. 



Genus EADULA Klein. 



Radula pelagica. 

 Plate IX, Figs. 3-5. 



Plagiostoma pelagica Mort. Synop., p. 61, PI. Y, Fig. 2. 



Gtenoides pelagica (Mort.) Gabb. Synop. Cret» Form., p. 114. Conrad, J. A. K. S., 



Vol. lY, p. 276. 

 Lima pelagica (Mort.) Meek. Check-list Smith. Inst., p. 7. 

 Badula pelagica (Mort.) Stoliczka. Palseont. Indica, Yol. Ill, p. 416. 

 JB. pelagica (Mort.) Meek. Geol. Surv. N. J., 1868, p. 724. 



Shell of small size, seldom measuring more than one and a half inches 



in its greatest length from beaks to base; very oblique, strongly ovate. 



