Boone, Echinodermata r Cruises of "Eagle" and "Ara," 1921-28 115 



bright rose-red or dull yellowish brown; the arms are banded trans- 

 versely with grayish green or dull yellowish brown on the dorsal 

 surface. 



Life history: Unrecorded. 



Technical description: All eight of the "Ara" specimens are 

 young adults. The disk diameter of an average specimen is 8 mm., 

 arm length 25 mm. The abactinal surface and interbrachial regions 

 of the actinal surface are covered with small rounded granules, be- 

 neath which the surface is paved with large, flat scales. The mouth- 

 shields are small, with the outer margin rounded; the inner margins 

 wedge-shaped, forming an acute angle. The side mouth-shields are 

 large, oblongish, meeting in the center. The mouth papillae are 16 

 to 17, blunt-tipped, squarish, except the two or three acuminate teeth 

 of the apex. Tooth papillae strong, triangulate, acuminate. Genital 

 slits not very long. 



The under arm-plate is somewhat shield-shape, with the outer mar- 

 gin rounded, the sides excavate, the inner margin shorter than the 

 outer, nearly straight. The side arm-plates are arched, projecting 

 well down on the ventral and dorsal surfaces and furnished on the 

 rounded outer margin with six short, pointed spines. The dorsal 

 arm-plate is longer than wide, with the inner margin straight, the 

 outer broader and convex, the lateral margins concave, divergent 

 outwardly. 



References: Ophioderma variegata Lutken, Vidensk. Meddel. Naturh. 

 Foren. Kjobenh., p. 21, 1856; Kong. Danske Vidensk. Selsk. 

 Skrifter. 5th Raekke, Bd. 5, p. 199, 1861.— H. L. Clark, Bull. 

 Amer. Mus. Nat. Hist., XXXII, p. 205, 1913 ; Mem. Mus. Comp. 

 Zool., vol. XXV, p. 302, pi. 18, figs. 7 and 8, 1915.— Boone, Bull. 

 Bingham Oceanog. Coll., vol. II, art. 6, p. 7, 1928. 



Ophioderma cinereum Muller and Troschel. 

 Plates 68 and 69. 



Type: Locality unknown. Deposited in the Wien Museum. 



Distribution: Southern Florida, Bahamas, Cuba, Jamaica, Haiti, 

 St. Thomas, Barbados, Mexican coast south of Vera Cruz, Panama, 

 Brazil, Port Seguro. Depth : littoral to 70 fms. 



Material examined : Two very large specimens, dredged in 70 fms., 

 south of Marquesas Keys, Florida, March 2, 1924, by the "Ara," 

 "William K. Vanderbilt, commanding. 



