Boone, Echinodermata, Cruises of "Eagle" and "Ara," 1921-28 111 



as wide as long, with the outer and inner margins nearly straight, the 



outer lateral corner rounded; the lateral margins are somewhat 



rounded. 



References : Ophioderma cinereum Muller and Troschel, Syst. Ast., 



p. 87, 1842.— H. L. Clark, Mem. Mus. Comp. Zool., XXV, p. 301, 



1915. 

 Ophioderma antillarum Lutken, Vid. MeddeL, p. 9, 1856; Add. ad 



Hist. Ophiur., pt. 2, p. 88, pi. 1, figs. 1 a-1 e, 1859. 

 Ophiura cinerea Lyman, Illus. Cat., Mem. Mus. Comp. Zool., I, p. 27, 



1865. — Verrill, Trans. Conn. Acad. Arts and Sci., X, p. 485, 



1900; ibid, XII, p. 325, 1904-07. 



Ophioderma longicauda (Linck). 

 Plate 70. 



Type: The depository of Linck 's type is not known to me. 



Distribution: Littoral. Abundant in the Mediterranean Sea, the 

 Adriatic Sea, on both coasts of France, in the Atlantic it is found on 

 the coast of the Hispanic Peninsula and the coast of France as far 

 as La Rochelle, on the west African coast it is found down to the 

 equator. It is also found in the Azores and at Madeira. 



Material examined : Eight specimens, dredged in 19 fms., 10 miles 

 south of Cagliari, Sardinia, July 23, 1927, by the "Ara," Cat no. 217. 



Color : Alcohol preserved specimen : abactinal surface brown with 

 grayish flecks; actinal surface creamy with grayish tinge. 



Technical description: Disk pentagonal, diameter 14 mm., arm 

 length 65 mm. The entire abactinal surface is covered by regularly 

 distributed, coarse, rounded granules which are also continuous on the 

 outer lateral and the interbrachial spaces of the actinal surface. The 

 genital slits are of moderate length with the margins granulated. 

 Mouth papillae 10 to 12, unequal, with the outer surfaces flattish, the 

 first tooth produced at its inner angle into a slender process; the 

 second tooth the largest of the series, squarish; the third to 

 ninth (or eleventh in the larger series) teeth are of irregular 

 shape, usually tapered distally; the tooth at the apex of the jaw is 

 about as large as the first tooth and is rounded distally. Teeth five, 

 strong, blunt, triangular, in series, one above the other, the basal one 

 being narrower distally than the others. Mouth-shields heart-shaped, 

 wider than long, with the rounded apex directed inward. In some 



