MIOCENE ECHINODERMATA. 



Class STELLEROIDEA. 



Subclass ASTEROIDEA. 



Order CRYPTOZONIA. 



Family ASTERIIDjE. 



Genus A STEM AS Linn.'. 



ASTERIAS REMONDII Gabb. 



Asteriasremondii Gabb, 1869, Geol. Survey California, Paleontology, vol. 2, pp. 37, 38, PI. XIII, fig. 69. 

 Asterias remondi Cooper, 1888, State Mineralogist California Seventh. Ann. Bept., p. 270. 

 AsUrias remondi Weaver, 1909, Univ. California Dept. Geology Pub., vol. 5, No. 16, p. 261. 



Description. — -Since no material representing tbis species bas been accessible for study tbe 

 description of Gabb is given verbatim : 



Animal large, robust, five rayed; rays more than twice as long as the diameter of the disk, thick on the margin. 

 Upper surface covered by short, club-shaped spines, narrow toward the base, and bluntly rounded above; on the sidea 

 these same spines are more closely placed, and on the undersurface they are so close that they are in contact; ambu- 

 lacra broad, bearing numerous small, very slender spines. 



Locality. — Star Fish Point, Martinez, Contra Costa County, Cal. (Cooper), San Pablo Bay, 

 Cal. t Weaver). 



Geologic horizon. — San Pablo formation, upper Miocene. 

 Collection. — Unknown. 



Subclass OPHIUROIDEA. 



Order ZTGOPHIT7RJE. 



Family OPHIODERMATIDJE. 



Genus OPHIODERMA MUUer and Trosch. 



Ophioderma (?) sp. 



Plate LXXXIV, figure 1. 



Ophioderma ? sp. Clark, 1904, Maryland Geol. Survey, Miocene, p. 433, PL CXX, fig. 3. 



Description. — Fragments of the arms of an Opbiurian occur in the indurated ledge just above 

 sea level along St. Marys River. It is impossible to determine the relations of the form with 

 accuracy, but it is probably an Ophioderma. The fragments were found in the interior of the 

 shells of large gastropods. 



Locality. — St. Marys River, Md. 



Geologic horizon. — St. Marys formation, middle Miocene. 



Collection. — Johns Hopkins University (T 1000). 



Family AMPHIURIDJE. 

 Genus. AMPHITJRA Forbes. 



Amphiuka sanctjbcrucis Arnold. 

 Plate LXXXIV, figures 2 and 3. 

 Amphiura sanctxcrucvs Arnold, 1903, U. S. Nat. Mus. Proc, vol. 34, pp. 403-406, PI. XI, figs. 1, 2. 

 Description. — Arnold describes the species as follows : 



Disk attaining a diameter of 13 millimeters, delicate, covered with small naked overlapping scales. Arms five, 

 long, slender, even or tapering very slightly and more or less flattened. Arm spines moderately short and sharp 

 178 



