iARK] CARDIASTER CINCTUS. 75 



Locality and geological horizon. — This species is from the yellow lime- 

 stone of the middle marl bed (upper Cretaceous) of Viuceii town, New 

 Jersey. 



Collection. — Johns Hopkins University. 



CAIIDIASTEE Forbes. 



CARDIASTER CINCTUS MortOD. 



Plate XXXVII, Figs. la^h. 



■' Spatangiis sp. Morton, 1829. Philadelphia Acad. Nat. Sci. Jour., 1st ser., vol. 6, p. 122. 

 ^Ananchijfts sp. Morton, 1830. Am. Jour. 8ci., 1st ser., vol. 17, p. 287. 

 ^Ananchytes cinctuts Morton, 1830. Philadelphia Acad. Nat. Sci. .Jour., Istser., vol. 6, 

 p. 200. 

 Ananchjites fhnhriatits Morton, 1830. Philadelphia Acad. Nat. Sci. Jour., 1st ser., vol. 



G, p. 200. . 

 .Ananchyivs ciiicliix Morton, 1830. Am. Jour. Sci., Ist ser., vol. 18, p. 246, PI. 3, Fio;. 7. 

 .-Ananchyti's Jimhriatns Morton, 1830. Am. Jour. Sci., 1st ser., vid. 18, p. 245, PI. 3, 



Fijr. 9. 



.Ananchyivs cinctiis Morton, 1834. Synop. Organ. Remakis, Cretaceous, p. 78, PI. 3, 



Fig. 19. 

 "Ananchytes fimhriatus Morton, 1834. Synop. Organ. Remains, C'retaceous, pp. 77, 79, 



PI. 3, Fig. 20. 

 ' Holaster cinctus Agassiz and Desor, 1840. Cat. Syst., p. 1. 



Holaster cinctus Agassiz and Desor, 1847. Cat. rais., p. 133. 

 ^Holaster fimbriatus Agassi/., 1847. Cat. rais., p. 141. 

 , Holaster cinctus d'Orbigny, 1847. Prodrome, vol. 2, p. 269. 

 Holaster fimhriatus d'Orhigny, 1847. Prodrome, vol. 2, p. 269. 



• Holaster cinctus lironn, 1848. Index Pal., vol. 1, p. 593. 

 'Ananchytes Jimbriutus Bronn, 1848. Index Pal., vol. 1, j). 70. 



■^Cardiaster cinctus d'Orbigny, 1853-'60. Palcont. frau^taise, vol. 6, p. 147; PI. 905, Fig. 4. 

 Cardiaster fimbrialus d'Orbigny, 1853-'60. Pal^out. franyaise, vol. 6, p. 147; PI. 905, 



Fig. 3. 

 Cardiaster cinctus {Cardiaster fimhriatus) Desor, 1858. Synop. des l^chinides fossiles, 

 p. 346. 

 "Ananchytes cinctus Gabb, 1859. Cat. Invert. Fossils, Cretaceous, p. 18. 



* Ananchytes fimbriatus (iabb, 1859. Cat. Invert. Fossils, Cretaceous, \i. 18. 

 ■'Holaster cinctus Credner^ 1870. Zeitschr. d. deutsch. geol. Gesells. xxil, p. 218. 

 '■Holaster cinctus Clark, 1891. Johns Hopkins University Circulars, No. 87, p. 77. 



Determinative cliaracters. — Test cordate, distinctly grooved anteri- 

 orly; contracted posteriorly; upper surface convex; lower surfiice flat. 

 Ambulacra wide. Apical disk much elongated, consisting of lour per- 

 forated genital and five c'ular plates situated slightly forward of the 

 center. Mouth oi^ening near the anterior margin. Anal opening oval, 

 situated on the truncated posterior margin. 



Bimenmms. — Length, 2 inches; width, li inches; height, IJ inches. 



Beticriptlon. — This species, which is among the earliest of the Echinoid 

 forms recognized from American Cretaceous strata, is distinctly cordi- 

 form, with a pronounced groove on tlie anterior face that is occupied 

 by the unpaired ambulacrum. Opposite thereto is a slight ridge at tlie 

 central suture of the unpaired posterior iuterambulacrum that is sud- 



