CBETACEOUS ECHINODERMATA. 67 



Suborder CLYPEASTRINA. 

 Family CLYPEASTRID.E. 



Genus ECHINANTHUS Leske. 



Echinanthtts mortonis (Michelin). 



Pygorhynckus mortonis Michelin, 1S50, Rev. et mag. zoologie, vol. 2, p. 240. 

 Hardouinia mortoni D'Arcliiac and Haime, 1S53, Foss. numm. de l'lnde, p. 214. 

 Eckinanthus mortonis Desor, 1S58, Synopsis des £chinides fossils, p. 295. 

 Echinanthus mortonis Dujardin and Hupe, 1862, Hist. nat. zoophytes £chin., p. 5S4. 

 Eckinanthus mortonis Conrad, 1865, Acad. Nat. Sci. Philadelphia Proc., p. 75. 

 Eckinanthus mortonis Conrad, 1866, Checklist, p. 22. 

 Echinanthus mortonis Quenstedt, 1S72-1875, Petrefac. Deutsch., p. 692. 



Description. — The author has been unable to examine a specimen of this species. Desor 

 gives the following description: 



Espece remarquable entre tous les Echinanthus par sa forme elevee, conique, a, peu pres aussi large que longue, 

 rappelant un peu les Pygurus par sa physionomie. Sommet ambulacraire legerernent excentrique. Petales larges, 

 pointus a. leur extremity, depassant un peu la nioitie de la distance entre le sommet et le bord. Periprocte grand, 

 situe a mi-distance du sommet, a l'origine d'un large et profond sillon. Dessous concave. Peristome a peu pres 

 central, petit, entour6 d'un floscelle tres accuse. 



D'Archiac and Haime proposed to make of this species the type of a new genus which they 

 called Hardouinia. Notwithstanding the fact that the floscelle is somewhat more pronounced 

 than in any of the other species Desor and others who examined the form considered that the 

 characters were not sufficiently pronounced to justify a generic separation from Echinanthus. 



Locality. — Pontotoc, Miss. 



Geologic horizon. — Ripley formation, Upper Cretaceous. The reference of this form to the 

 Tertiary by earlier authors is evidently incorrect. 



Collection. — Unknown. Desor mentions its presence in the collection of Verneuil. 



Genus SCUTE LL, ASTER (?) Cragin. 

 'Scutellaster cretacetjs Cragin. 



Scutellaster cretaceus Cragin, 1895, Am. Geologist, vol. 15, pp. 90, 91. 



Description. — The specimen on which this genus and species are based is so imperfect that 

 it seems better to defer the acceptance of both until more diagnostic material is obtained. 

 Cragin in a letter to the author says: "I fear it [Scutellaster] is not after all a new genus as 

 I supposed when I described it as such." 



Locality. — East slope of Shooks Run, Piatt Avenue, Colorado Springs, Colo. 



Geologic horizon. — Arenaceous shale of Fox Hills sandstone of Montana group, Upper 

 Cretaceous. 



Collection. — Colorado College. 



Order ATELOSTOMATA. 



Suborder ASTERNATA. 



Family ECHINONEID.E. 



Genus PYRINA Desmoulins emend. De Loriol. 

 Pyrina parrti Hall. 

 Plate XXVII, figures la-j. 



Pyrina parryi Hall, 1857, IT. S. and Mex. Boundary Survey Rept., vol. 1, pt. 2, p. 144, PI. I, figs. 1-ld. 

 Pyrina parryi Gabb, 1859, Catalogue Invertebrate Fossils Cretaceous, p. 19. 

 Pyrina parryi Meek, 1864, Smithsonian Misc. Coll., vol. 7 (177), p. 2. 

 Pyrina parryi Clark, 1891, Johns Hopkins Univ. Circ, vol. 10, No. 87, p. 76. 



