266 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



o j . Arms, at least in the proximal half, with a median dorsal carination, each brachial with a median 

 ridge or a terminal median tubercle extending more or less backward in the mid-dorsal line; 

 size smaller, the arms not over 180 mm. long, and usually less than 130 mm. in length (Java 

 and the western side of the Bay of Bengal and westward to east Africa from the Red Sea to the 

 Cape of Good Hope; St. Helena; Venezuela to St. Lucia and southward to Santa Catarina 



Island, southern Brazil; 0-55 meters; 508 meters off St. Lucia) carinata (p. 291) 



6 1 . Outer half of arms quite smooth dorsally, wholly without a trace of carination, or with the 

 carination feebly indicated; cirri relatively large, 20-35 (averaging 24) mm. long, with 19-34 

 (averaging 25) segments; arms up to 180 mm. in length, though seldom exceeding 150 mm. 

 (northeastern coast of Ceylon and northward along the eastern coast of India to Waltair; 



?Java; 0-9 meters) carinata clarki (p. 281) 



b 2 . Arms carinate to the tip; cirri smaller. 



c 1 . Cirri with more than 20 segments; proximal pinnules not spine-tipped. 



d 1 . Cirri with 20-32 (usually 23-24) segments, 15-27 (usually 18-20) mm. long; arms up to 

 180 mm. long, but seldom more than 130 mm. (Cargados Carajos, the Seychelles, Far- 

 quhar Atoll, Mauritius, Madagascar, and Reunion, and the African coast from Zanzibar 

 southward and westward to False Bay, Cape of Good Hope; St. Helena; from Santa 

 Catarina Island, southern Brazil, northward to St. Lucia, Tobago, Trinidad, and 



Venezuela; 0-55 meters; 508 meters off St. Lucia) carinata carinata (p. 291) 



<i 2 . Cirri with 20-26 (usually 20-22) segments, 15-22 (averaging 18) mm. long (coast of 

 Travancore State, southwestern India, the Gulf of Manaar, and the western and south- 

 western coasts of Ceylon; 0-15 [?73] meters) carinata indica (p. 337) 



<?. Cirri with 16-18 segments, 13 mm. long; proximal pinnules spine-tipped; arms 50-80 mm. 

 long (Red Sea and eastward to Muscat; littoral) carinata audouini (p. 342) 



TROPIOMETRA MAGNIFICA A. H. Clark 



PLATE 33, FIGURES 170-173 



Tropiometra magnified A. H. CLABK, John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936 

 p. 87 (listed), p. 90 (Mabahiss station 24); description, p. 91 (comparisons); pp. 101, 104, 

 105; pi. 1, fig. 1. 



Diagnostic features, A very large, but slender, form with the arms narrow and 

 strongly rounded dorsally, the brachials beyond the base of the arms triangular or 

 wedge-shaped, from half again to twice as broad as the length of the longer side. 

 The cirri are XXV, 35-37, 60-65 mm. long. The arms are 265 mm. long. 



Description. The centrodorsal is thick discoidal, 9 mm. in diameter at the base 

 with a broad convex dorsal pole 7 mm. in diameter. The cirrus sockets are arranged 

 in two crowded, alternating, and more or less irregular marginal rows. 



The cirri are XXV, 35-37, the longest, about the periphery of the centrodorsal, 

 60-65 mm. long. The first segment is very short, the second is about three times as 

 broad as long, and those following gradually increase in length to the eighth, which is 

 about as long as broad, and the eleventh, which is somewhat longer than broad. 

 The segments following are similar, the distal becoming slightly shorter, so that the 

 last 12 or 14 are about as long as broad, and the last two slightly broader than long. 

 The segments in the outer half of the cirri are slightly compressed laterally and faintly 

 carinate in the mid-dorsal line. The longer earlier segments may be slightly con- 

 stricted centrally. The opposing spine is minute and terminal, or altogether absent. 

 The terminal claw is somewhat longer than the penultimate segment, rather stout, 

 and moderately curved. 



The radials project slightly beyond the rim of the centrodorsal. Their distal 

 edge is slightly and regularly concave, so that they are about twice as long in the 



