ECHINODERMATA. 289 



imperforate mamelon. Oral opening large, with 10 deep inci- 

 sions. The apical disk not observed, but the broken opening in 

 the type specimen is large and pentagonal in outline. 



The dimensions of the type specimen are: height, 12.5 mm.; 

 width, 21.9 mmi. 



Remarks. — This species is the only American representative 

 •of the genus so far as known, and is quite distinct from any of 

 the European forms. 



Formation and locality. — Vincentown limesand, Timber Creek 

 (Clark). 



Geographic distribution. — New Jersey. 



Order SPATANGOIDA. 

 Family BCHINOBRISSINAE. 



Genus TrEmatopygus d'Orb. 



Trematopygus cruciferus (Morton). 



Plate XL, Figs. 1-9. 



1830. Ananchytes crviciferus Mort., Am. Jour. Sci., ist ser., vol. 



18, p. 245, pi. 3, fig. 8. 

 1830. Ananchytes crucifertts Mort., Jour. Acad. Nat. Sci. Phil., 



1st ser., vol. 6, p. 201. 



1833. Nucleolites crucifer Mort., Am. Jour. Sci., ist sen, vol. 



23, P- 294. 



1834. Nucleolites crucifer Mort., Synop. Org. Rem. Cret. Gr. 



U. S., p. 75, pi. 3, fig- 15- 



1855. Trematopygus crucifer d'Orb., Pal. Eranc, Terr. Cret., 

 vol. 6, p. 387, pi. 953, figs. lo-ii, pi. 963, figs. 1-5. 



1859. Nucleolites crucifer Gabb, Cat. Inv. Eoss. Cret. Eorm. 

 U. S., p. 19. 



1864. Nucleolites crucifer Meek, Check List Inv. Eoss. N. A., 

 Cret. and Jur., p. 2. 



1868. Nucleolites crucifer Con., Cook's Geol. N. J., p. 377, fig- 

 ure; p. 722. 



1870. Nucleolites crucifer Credner, Zeitsch. d. Deutsch. Geol. 

 Gesell., vol. 22, p. 217. 

 19 PAL 



