364 PROCEEDINGS OP THE ACADEMY OP 



ever, without question, the same as iV. rectilabrum Con., the types of which are 

 in the Academy's collection. The latter species has long been considered by 

 me, and I believe by Mr. Meek, as being identical with N. (Limatia) concinna 

 H. & M. The only difference that I could observe between the types of Mr. Con- 

 rad's species and Dr. Shumard's was, that the spire of the latter was about -05 

 iu. higher. This, of course, will not entitle it to a distinct specific rank. 



Volutimthes Swains. 



V. C o n r a d i Gabb. This species, like many others of the New Jersey fos- 

 sils, was described originally from casts. It is by no means rare. I have on 

 two occasions seen portions of the shell. One in the collection of the Mount 

 Holly Society is very thick, marked by, (I think about fifteen) moderately sized 

 longitudinal ribs, crossed by numerous fine revolving impressed lines, placed 

 about an eighth of an inch apart. It belongs with V. bella, V. Tezana, and V. 

 nasula, to the genus Fulguraria. 



Clavagella Lam. 



C. armata Morton is such a rare species, that I had almost believed that 

 Dr. Morton had made some mistake in describing it. The type is lost and I had 

 never seen the species, nntil I fortunately encountered it at Mt. Holly. 



The shell is larger and more robust than represented by Dr. Morton, but 

 there can be no doubt of the identity of the species. It is a true Clavagella. 

 One valve is evidently attached to the tube, while the other is free. I now pos- 

 sess one of the only two specimens of which I know. 



Venilia Morton. 



V. qu ad ra t a, n. s. Shell snbquadrate, gibbous; beaks anterior, nearly 

 terminal, cardinal line almost straight, slightly sloping downwards towards the 

 posterior edge, which is obliquely truncated. Anterior end rounded and merg- 

 ing into the basal edge, which is broadly curved. A prominent subangular 

 ridge passes from the beaks to the posterior basal angle, remaining very dis- 

 tinct to its termination. Posterior muscular scar round, anterior scar subcres- 

 centic. Surface unknown, (a cast.) 



Length, 1-5 inch. Width, 1-7 inch. Depth of valve, *75 inch. 



A cast from the " Upper member of the Ripley Group," from Mississippi. 

 Coll. Acad. From Dr. Spillmann. 



About the size of V. Conradi, this species can be distinguished by its regular 

 quadrate outline. This will also separate it from V. trigona. It has more 

 nearly the shape of V. trapezoidea or V. rhomboidea, but is very much larger 

 than either, and is somewhat more rounded in outline. 



Crassatella Lam. 



C. t r an s ver sa, n. s. Shell wide. Beaks (in cast) acuminate, prominent 

 and placed in little less than one-third of the width of the shell, from the an- 

 terior end, which is broadly rounded, being slightly more prominent abreast of 

 the muscular scars than elsewhere. Posterior extremity obliquely truncated, 

 subangulated below, and sloping with a curve to near the upper part of the 

 posterior muscular impressions, where it blends with the cardinal margin which 

 is straight, but most depressed behind. Basal edge sinuous, somewhat emar- 

 ginate just below the posterior muscular scars, as in C. Monmouthensis nob. 

 Pallial border marked by a strong rounded ridge. Edge crenulated internally. 

 Length. 1*3 in. Width, 1-9 in. Diameter, -75 in. (cast.) 

 This species, described from a cast in the collection of the Burlington County 

 Lyceum of Natural History, is as large as the average specimens of C. vadosa 

 Morton, but is much shorter in proportion to the width, being produced pos- 

 teriorly as much as C. pteropsis Con., but in a different manner. This latter 



[Nov. 



