MOLLUSCA. 839 



marl, and the greater compression of A. vanuxemi is probably 

 accidental and not of sufficient importance to justify the recog- 

 nition of distinct species. 



Formation and locality. — Merchantville clay-marl, Lenola 

 (163), Burlington (Whitfield). 



Geographic distribution. — New Jersey. 



Sub-class DIBRANCHIATA. 



Order BELEMNOIDEA. 



Family BBLEMNITIDAB. 



Genus Bei.Emnitei.la d'Orbigny. 



Belemnitella americana (Morton). 

 Plate CIX., Figs. 1-4. 



1830. Belemnites A'mericanus Mort., Am. Jour. Sci., ist ser., 



vol. 17, p. 281 ; vol. 18, pi. I, figs. 1-3. 

 1830. Belemnites subconicus Mort., Jour. Acad. Nat. Sci. Phil, 



1st ser., vol. 6, p. 99, pi. 5, fig. 7. (Not B. subconiciis 



Lam.) 

 1830. Belemnites Americaniis Mort., Jour. Acad. Nat. Sci. 



Phil., 1st ser., vol. 6, p. 192, pi. 8, fig. 

 1834. Belemnites Americanus Mort., Synop. Org. Rem. Cret. 



Gr. U. S., p. 34, pl. I, figs. I, 2, 3, 3 a. 

 1850. Belemnitella mucronata d'Orb., Prod. Paleont., vol. 2, 



p. 211. 

 1858. Belemnitella americana Emmons, Rep. N. Car. Geol. 



Surv., p. 246, fig. loi. 

 1 861. Belemnitella mucronata Gabb, Synop. Moll. Cret. Form., 



p. 78 (22). 

 1864. Belemnitella paxillosa Meek, Check List Inv. Foss. N. 



A., Cret. and Jur., p. 26. 

 1868. Belemnitella mucronata Con., Cook's Geol. N. J., p. 375, 



figure; p. 731. 

 1868. Belemnitella paxillosa Con., Cook's Geol. N. J., p. 731. 



