328 STUART WELTER 



26. Scalaria sp. undet. A fragmentary specimen of a member of 

 this genus has been observed. It is too imperfect for identifica- 

 tion. 



27. Turritella encrinoides Mort. ? Fragments of the internal casts, 

 as well as impressions of the external markings, of a Turritella 

 occur in the Cliffwood fauna, which seem to be referable to this 



species. 



CEPHALOPODA 



28. Placenticeras placenta De Kay. A single fragment of the cast 

 of the chamber of habitation of a large ammonite resembles in 

 all respects similar specimens known to belong to P. placenta, 

 and little doubt can be entertained as to the correctness of this 

 identification of the Cliffwood specimen. 



29. Baculites sp. undet. A fragment of the cast of the chamber 

 of habitation may certainly be referred to this genus. The 

 specific determination cannot be satisfactorily made. It may 

 belong to the common B. ovatus of the New Jersey Cretaceous 

 beds, but it seems to possess stronger, oblique, annular ridges 

 than is usual in that species. 



CRUSTACEA 



30. Tetracarcinus subquadratus n. gen. and sp. (Figs. 4-6). Sev- 

 eral species of crustaceans, all of them probably undescribe'd, 

 are present in the Cliffwood fauna. A single one of these forms, 

 however, may be considered in the present connection, for the 



Fig. 4 Fig. 5 Fig 6 



reason that it is also a common form in the fauna of the Wood- 

 bury clay. It has not been possible to place this little crab in any 

 of the described genera, and therefore it may be called Tetracarci- 

 nus on account of its subquadrangular form, with the specific 

 name subquadratus. The dimensions of an average specimen 

 are: length of carapace, i4.5 mm ; breadth, i4 mm ; greatest con- 



