278 CRETACEOUS PALEONTOLOGY. 



tions upon the margin of the star-fish, but most of them are higher 

 than wide and are swollen on the outer surfaces. Surface of the 

 plates finely punctate, the depressions being arranged in rows that 

 intersect at right angles. 



Remarks. The remains of star-fishes are among the rarest 

 fossils in the Cretaceous rocks of America. The form and size 

 of the individual of which the plates here described were a part 

 cannot be determined, and it is not worth while to attempt to 

 make comparisons with other forms. The only other American 

 star-fishes known from the Cretaceous is Pentagonaster browni 

 Weller, 1 from near the summit of the Cretaceous beds near 

 Lander, Wyoming, and Pentaceros asperulus, described below. 

 All of these forms are members of the order Phanerozonia, char- 

 acterized by the presence of highly developed marginal plates, but 

 the detached plates from New Jersey are quite different from 

 those of the Wyoming specimen. 



Formation and locality. Vincentown limesand, Vincentown 



(154). 

 Geographic distribution. New Jersey. 



Genus PENTACEROS Quick. 



Pentaceros asperulus n. sp. Clark. 

 Plate VI, Figs. 18-19. 



Description. Known only from detached body plates, which 

 are irregular in outline, the intermittent articulating surfaces on 

 the perimeter producing a roughly polygonal outline. The sur- 

 face of the plates uneven, the irregularly flattened areas pro- 

 viding attachment for spines. The central portion of the plates 

 is higher than the truncated margins. 



The dimensions o<f one plate are: length, 6.5 mm.; width, 4 to 

 5 mm.; thickness, 3.5 mm. 



Remarks. The body of the star-fishes of this genus, whose 

 form is known, is pentagonal, with long, narrow arms : the sur- 

 face is covered with irregularly shaped plates that touch intermit- 

 tently at their margins, their surfaces being uneven and bearing 

 spines. Two or three well-preserved specimens of the small sur- 



'Jour. Geol., vol. 13, pp. 257-258. 



