280 BULLETIN 82, UNITED STATES NATIONAL MtJSEXnVI VOLUME 1 



Blake," pt. 2, 1888, p. 124 (part) (Yucatan Bank; various stations between Dominica and Gre- 

 nada, 75-291 fms.; Straits of Florida), p. 127 (myzostomes) . — Braun, Centralbl. Bakteriol. und 

 Parasitenk., vol. 3, 1888, p. 186 (myzostomes; after von Graff).— Hamann, Bronn's Klassen und 

 Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1579 (listed).— Hartlaub, Mem. Mus. 

 Comp. Zool., vol. 27, No. 4, 1912, p. 280 (listed), pp. 389-394 (synonymy; Sand Key, possibly 

 Corwin position 1; detailed description and discussion), pi. 8, figs. 1-12, pi. 15, figs. 2, 6. 



Crinoids Nuttino, Bull. Lab. Nat. Hist., Univ. Iowa, vol. 3, Nos. 1, 2, January 1895, pp. 164, 165 

 (Sand Key Light bearing X. by W. % W., 15 miles distant; 120 fms.; abundance). 



Coccometra hagenii A. H. Clark, Proo. Biol. Soc. Washington, vol. 21, 1908, p. 129 (listed); Smith- 

 sonian Misc. Coll., vol. 61, No. 15, 1913, p. 65 (published references to specimens in B.M.; off 

 Sombrero [Florida Keys], 105 fms.); Unstalked crinoids of the Siboga-Exped., 1918, p. 219 (in 

 key; range), p. 221 (synonymy); The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 

 41 (range). — Pelseneer, Bull. Soc. Zool. France, vol. 53, 1928, p. 173 (parasitized by Eulitna 

 sp.). — H. L. Clark, Scientific Survey of Porto Rico and the Virgin Islands, vol. 16, pt. 1, 1933, 

 p. 8 (West Indies in less than 10 fathoms), p. 9 (in key), p. 12 (occurrence). — A. H. Clark, Mem. 

 Soc. CubanaHist. Nat., vol. 14, No. 2, 1940, p. 141 (in key), p. 144 |(references); Bull. U.S. 

 Fish. Coram., vol. 55, 1954, p. 374 (listed). 



Cocometra hageni 11. L. Clark, Univ. Iowa Monographs, ser. 1, No. 15; Bull. Lab. Nat. Hist., vol. 7, 

 No. 5, April 1918, p. 12 (Bahama Exped. Stas. 27, 33, 48, 54, 57, 58, 62, 64; no loc; discussion). 



Diagnostic features. — There are no black marldngs; P2 is nearly or quite as long as 

 P, ; P, has the segments m the distal half short, like those in the proximal half; the cirri 

 have 17 to 25 segments of wliich the antepenultimate and preceding are markedly 

 longer than broad; and the terminal claw is strongly curved. 



[Note by A.M.C] Mr. Clark gave the number of cirrus segments as 17 to 20 in 

 this typescript but there are up to 25 in the four specimens from Bibb station 6P in 

 the British Museum. 



Description. — The centrodorsal is low hemispherical with a moderate to rather 

 large area at the dorsal pole free of cirri and usually papillose. The cirrus sockets are 

 closely crowded and irregular in arrangement. 



The cirri are XXX-L, 17-20, from 10 to 15 mm. long, delicate and rather slender, 

 usuall}- becoming laterally compressed and increasing slightly in dorsoventral diameter 

 in the tcmiLnal fourth. The fii'st segment is very short, the second is about as long as 

 broad, the third is about twice as long as broad, the fourth is longer still, and the fifth, 

 which is usuallj- the longest, is about tlu-ee times as long as broad; from this point 

 onward the segments gi'adually decrease in length so that the antepenultimate is rather 

 less than tvnce as long as broad and the penultimate is about as long as broad. The 

 opposing spine is obsolete. The terminal claw is rather longer than the penultimate 

 segment and strongly curved. On the last 3 or 4 segments the median portion of the 

 distal border may be slightly produced. There is no overlappmg of the distal ends of 

 the segments, and the longer earlier segments are only slightly constricted centrally. 



The radials are concealed by the centrodorsal, or are just visible as low triangles in 

 the mterradial angles. The IBrj are short, broader pro.ximally than distally, almost 

 obscured in the median line by a posterior projection from the IBr2 which are longer than 

 broad with the anterior angle much produced, the distal sides very concave, and a strong 

 rounded posterior process. The IBrj are much broader than the distal ends of the 

 IBr,, so that each IBr series appears much constricted at the articulation. 



The 10 arms are from 40 to 100 mm. long. The first brachial is very short with 

 the inner half almost bandlike and the outer half triangular. The second bracliial is 

 irregularly quadrate with a posterior prolongation deeply incising the first brachial. 

 The tiiird brachial (forming the hypozygal of the first syzygial pair) is triangular with 



