74 MESOZOIC AND CENOZOIC ECHINODERMATA OF THE UNITED STATES. 



The ambulacra are subpetaloidal on the upper surface. The posterolateral ambulacra 

 are somewhat longer than the others. 



The apical system is slightly excentric, being situated anterior to the apex. 



The peristome is small, pentapetaloidal and situated well anteriorly. The periproct is 

 small, low down on the overhanging, truncated posterior margin. 



Related forms. — This species is distinct from either 0. oviformis 6r C. pusillus. Its posterior 

 margin and the position of its periproct very readily separate it. 



Locality. — Bluff east of Atlantic Highlands, N. J. 



Geologic horizon. — Navesink marl of Monmouth group, Upper Cretaceous. 



Collection. — Johns Hopkins University (T 3010). 



Catopygus sp. 

 Gatopygus sp. indet. Weller, 1907, Cretaceous paleontology of New Jersey: Geol. Survey New Jersey, p. 293. 



A poorly preserved specimen of Catopygus presents some points of similarity to C. pusillus 

 but apparently differs from it in other features. In its imperfect state of preservation it can 

 not be assigned with certainty to that species. Some of the most important diagnostic charac- 

 ters are lacking. 



Locality. — Beers Hill Cut, south of Keyport, N. J. 



Geologic horizon. — Tinton sand member of the Eedbank sand, Monmouth group, Upper 

 Cretaceous. 



Collection. — New Jersey Geological Survey. 



Genus CASSIDtrLTTS Lamarck. 



Cassidulus florealis (Morton). 



Plate XXX, figures la-1. 



Clypeaster sp. Morton, 1830, Acad. Nat. Sci. Philadelphia Jour., 1st ser. vol. 6, p. 202. 



Clypeaster florealis Morton, 1833, Am. Jour. Sci., 1st ser., vol. 23, p. 294. 



Clypeaster florealis Morton, 1834, Synopsis Organic Remains Cretaceous, p. 76, PI. Ill, fig. 12, and PI. X, fig. 12. 



Pygurus florealis Agassiz and Desor, 1847, Catalogue raisonnil, p. 141. 



Clypeaster florealis Bronn, 1848, Index palseontologicus, p. 312. 



Faujasia florealis D'Orbigny, 1853-1860, Paleontologie francaise, vol. 6, p. 319, PL GMXX, figs. 5, 6. 



Faujasia florealis Desor, 1S58, Synopsis des echinides fossiles, p. 318. 



Clypeaster florealis Gabb, 1859, Cat. Invert. Fossils Cretaceous, p. 18. 



Cassidulus florealis Meek, 1864, Smithsonian Misc. Coll., vol. 7 (177), p. 2. 



Pygurus florealis Conrad, 1868, Geology of New Jersey, App. A, p. 722. 



Cassidulus florealis Clark, 1891, Johns Hopkins Univ. Circ, vol. 10, No. 87, p. 76. 



Cassidulus florealis Clark, 1893, Johns Hopkins Univ. Circ, vol. 12, No. 103, p. 52. 



Cassidulus florealis Clark, 1893, U. S. Geol. Survey Bull. 97, pp. 66, 67, PL XXVIII, figs. la-1. 



Cassidulus florealis Johnson, 1905, Acad. Nat. Sci. Philadelphia Proc, vol. 57, p. 7. 



Determinative characters. — Test subcorneal in outline, subpentagonal, slightly longer in 

 the anteroposterior diameter than the lateral, rounded anteriorly, angular posteriorly; apex 

 slightly forward of the center. Ambulacra narrow; poriferous zones petaloidal on the upper 

 two-thirds of the dorsal surface. • Interambulacra wide, covered with small perforated tubercles. 

 Apical system small, situated anteriorly. Peristome pentagonal, with well developed floscelle. 

 Periproct supramarginal, in a short, narrow sulcus. 



Dimensions. — Length 35 millimeters; breadth 32 millimeters; height 19 millimeters. 



Description. — This species, the earliest of this genus recognized from American deposits, 

 has a subconical test of moderate height, with a subpentagonal margin. The angularity is more 

 pronounced posteriorly than anteriorly, the anterior portion of the margin being distinctly 

 rounded. The anteroposterior diameter is but slightly greater than the lateral, while the height 

 is a little more than one-half of the same. The apex is a short distance in front of the center 

 of the upper surface, the slope of the anterior face being sharper than that of the posterior. 



The ambulacra are narrow. The poriferous zones consist of a double row of pores that are 

 arranged in petaloidal form on the upper two-thirds of the dorsal surface and as phylloidal 

 expansions in the vicinity of the mouth edges. In the petaloidal portion the pores of the inner 



