248 PALEONTOLOGY OF NEW JERSEY. 



fifth of the distance from the margin of the inclosed volution to the back 

 of the shell from the inner edge. Prof Cope states at the edge of the inner 

 fourth. 



The shell substance, some of which remains on the inside of the cast 

 and between two of the chambers, has been very thick, more than a six- 

 teenth of an inch, and presents an imperfect columnar or prismatic structure 

 on the edge. The sides of the cast also show it to have been very heavy 

 where the septa have joined the outer shell, as the cast shows the ridges 

 and chamfering of the edges when the shell has been removed. Some of 

 the cavities left between the filling of chambers also are nearly or quite a 

 line in thickness. Longitudinal lines also mark the cast, showing evidence 

 of muscular attachment along the sides of the chambers between the 

 umbilical cavity and the septal processes or lateral lobes of the septa. 



Mr. Meek refers this species to Conrad's genus Hercoglossa, which was 

 founded upon Nautilus orbiculatus Tuomey. Conrad's description of the 

 genus in the Am. Jour. Conch., vol. 2, p. 101, is as follows: "Nautiloid; 

 septa angular and linguiform ; apex of the angle, or tongue-shaped lobe, 

 not contiguous with the adjacent septum; siphon large or moderate, situated 

 within the center, or between the middle and inner margin, and not dorsal 

 or funnel-shaped, but tubular and gradually tapering." Aturia should have 

 a funnel-shaped, dorsal siphon, which this species has not, consequently 

 can not be a true Aturia. Dr. Tuomey's N. orbiculatus, which was Conrad's 

 type of Helicoglossus, is probably at least generically if not specifically 

 identical with this, so that this will at least fall under that genus. 



Formation and locality: I think there can be no reasonable doubt of 

 the authenticity of the locality of the specimen used and figured, being as 

 marked on the label attached: Grlassboro, Grloucester County, New Jersey. 

 Prof. Cope states under his description that it was found at Heritage's marl 

 pits associated with Terehrafula Harlani and Teredo tibialis, which would 

 place it in the Middle Marls. There is also in the Academy's collection parts 

 of two chambers of the same species from Vincentown, New Jersey, collected 

 by T. M. Bryan, Esq., which would also most probably be from the Middle 

 Marls, as both these and tlie Upper Marls are near together at that point. 

 Another fragment in dark brown material occurs in the tray with the frag- 

 ments of Am. telifer, marked simply "N. J." 



