ECHINO'DERMATA. 277 



furrows at the reentrant angles alternately depressed and ele- 

 vated in successsive segments. The upper and lower outer 

 margins of the segments slightly rounded. The crenulations 

 of the articular faces of the segments visible externally, they are 

 arranged in five broad petaloid areas distinctly rounded ex- 

 ternally, the crenulations themselves being confined to a mar- 

 ginal band, from the inner edge of the reentering angles of the 

 column, the crenulated band is continued as a flat-topped double 

 ridge that reaches to and is confluent with a slight elevation 

 surrounding the axial canal. Axial canal small. 



Remarks. — This species is known only from a few small frag- 

 ments of the column. Of the two original specimens, one con- 

 sists of seven segments, the other of eight or nine. No trace of 

 the body of the crinoid has been observed. So far as known it 

 is the only representative of the Pentacrinidae in the Cretaceous 

 faunas of America. 



Formation and locality. — Vincentown limesand, Vincentown 

 (Gabh). 



Geographic distribution. — New Jersey. 



Class ASTEROIDEA. 

 Order PHANEROZONIA. 



Genus Goniaste;r Agassiz. 

 Goniaster mammilata Gabb. 



Plate VI., Figs. 10-17. 



1876. Goniaster mammilata Gabb, Proc. Acad. Nat. Sci. Phil, 



1876, p. 178, pi. 5, figs. 2, 2 a-b. 

 1893. Goniaster mainmillata Clark, Johns Hopkins Univ. Circ, 



vol. 12, No. 103, p. 51. 

 1893. Goniaster mammillata Clark, Bull. U. S. G. S., No. 97, 



P- 32, pl. 5, figs- I a-h. 

 1905. Goniaster mammillata Johns., Proc. Acad. Nat. Sci. Phil., 

 1905, p. 6. 



Description. — Known only from detached marginal plates. 

 These plates differ widely in form because of their different posi- 



