\ CRETACEOUS ECHINODERMATA. 81 



Description. — This species has a test of moderate size, nearly circular and much elevated. 

 The apex is near the center of the upper surface. The upper surface is convex, the lower nearly 

 flat. 



The ambulacra are wide, nearly similar, distinctly petaloidal above. The interambulacra 

 are prominent, projecting slightly above the ambulacra. 



The peristome is of small size and excentric forward. The periproct is small, supramar- 

 ginal and located in a very poorly defined groove. The material of the test has been destroyed, 

 only a cast remaining. 



Locality. — Pataula Creek, Clay County, Ga. 



Geologic horizon. — Ripley formation, Upper Cretaceous. 



Collection. — U. S. National Museum (31190). 



Cassidulus abruptus Conrad. 



Cassidulus abruptus Conrad, 1860, Acad. Nat. Sci. Philadelphia Jour., 2d ser., vol. 4, p. 291. 

 Cassidulus abruptus Agassiz, 1883, Mus. Comp. Zoology Mem., vol. 10, No. 1, p. 90. 

 (?) Cassidulus abruptus Clark, 1891, Johns Hopkins Univ. Circ, vol. 10, No. 87, p. 77. 

 (?) Cassidulus abruptus Clark, 1893, U". S. Geol. Survey Bull. 97, p. 92. 



This species, originally described by Conrad in I860, but not figured, has not been recog- 

 nized in material examined by the writer, so that its relations to the other forms described are 

 not known. 



Locality. — Tippah County, Miss. 



Geologic horizon. — Ripley formation, Upper Cretaceous. 



Collection. — Unknown. 



? Cassidulus subangulatus (Emmons). 



Gonioclypeus subangulatus Emmons, 1858, North Carolina Geol. Survey Rept., p. 309, figs. 242, 243. 

 Gonioclypeus subangulatus Conrad, 1866, Check list, p. 31. 



This species, which is described from the "Eocene, Wadsworth marl, Craven County," 

 N. C, by Emmons is probably a Cretaceous form and if the strata in which it was found are 

 Eocene was doubtless mechanically transported from older deposits. It is apparently identical 

 with C. subquadratus Conrad, but as its type form is unknown and no further material has been 

 found it seems wiser to maintain the separation of the two species until more positive data are 

 secured. 



Locality. — Craven County, N. C. 



Geologic horizon. — Peedee sand (?), Upper Cretaceous. 



Collection. — Unknown. 



Suborder STERNATA. 



Family ECHINOCORYTHID^l. 



Genus ANANCHYTES Mercati. 



Ananchytes ovalis Clark. 



Plate XXXV, figures la-h. 



Ananchytes ovalis Clark, 1893, Johns Hopkins Univ. Circ, vol. 12, No. 103, p. 52. 

 Ananchytes ovalis Clark, 1893, U. S. Geol. Survey Bull. 97, pp. 74, 75, PL XXXVI, figs. la-h. 



Ananchytes ovalis Weller, 1907, Cretaceous paleontology of New Jersey: Geol. Survey New Jersey, p. 295, PI. 

 XIII, figs. 1-8. 



Determinative characters. — Test medium sized, subovate cordate; contracted posteriorly; 

 upper surface convex; lower surface flat. Apical system elongated, consisting of four perfo- 

 rated genital and five ocular plates situated slightly forward of the center. Peristome near the 

 anterior margin. Periproct oval, situated on a slight protuberance of the posterior margin. 



