78 PALEONTOLOGY OF NEW JERSEY. 



however, were from New Jersey, but from Alabama. Mr. F. B. Meek has 

 clearly shown in his Invert. Pal. Geol. Sm-v. Territ., p. 50, that Morton's fig- 

 ures, given in the Synopsis (PI. XIII, p. 11, and PI. XVII, Fig. 3\ cannot be 

 depended on as conveying any idea of the true form of the specimens used, 

 and if one will examine Mr. Meek's figures there given they will easily be 

 convinced that even there a very different outline may, with equal propriety, 

 be drawn to his fig. 1 , so as to make the figure much more circular in out- 

 line. For some reason it seems to have been considered that I. Barabini 

 was a transversely elongated shell, having considerable convexity; and 

 that the circular, discoid forms belonged to different species. This may be 

 the fact, but I have never seen such a shell from Alabama, though they do 

 occur in Texas and in New Jersey, and possibly may in Alabama. These 

 circular and moderately convex forms, with broad, strong undulations, 

 certainly cannot be considered as distinct from I. Sagensis, and the flattened 

 form with more numerous concentric undulations are certainly allied to I. 

 Vaniixemi, v.'hile the flattened form with strong undulations would appear to 

 unite the two. In the Pal. Black Hills, I have considered the two forms 

 as probably distinct, though I had considerable doubt in my own mind; 

 and I am still more in doubt at the present time after examining speci- 

 mens from New Jersey, fiom South Carolina, from Eufaula, Ala., and from 

 Texas. Among those from the first three localities, I find the flattened forms 

 with numerous undulations most common, and the more convex form re- 

 sembling /. Sagensis quite rare, while at the West the reverse is usually the 

 case. Probably local influences have been at work. 



Formation and locality. — The convex form refe'Ted to above is from 

 the white limestone layer at Holmdel, N. J., Lower Marl Beds. I have also 

 seen a small individual of similar character marked as coming from near 

 New Egypt, probabl}' from the Lower Marl Beds near that town. Th.e 

 form resembling I. Vauuxemi is from Freehold, N. J., and the coarsely undu- 

 lated flattened form and the more convex one are together in an iron 

 nodule from Keyport, N. J., in the lower clays of the Cretaceous at that 

 place. The latter specimen is in the cabinet of the School of Mines, New 

 'V York; the others from the college collection at New Brunswick, New 

 Jersey. 



