128 Clark — New Genera of Vnstalked Crinoids. 



pinnule and those following are stouter than the first, and bear long 

 fusiform genital "lands. 



Color. — Yellow or brownish yellow. 



Geographic distribution. — Antarctic Seas, and Pacific Ocean north to 

 Panama, northern Japan, the Sea of Japan, and the Gulf of Tartary. 



Depth.— 140 to 1,600 fathoms. 



The elongate joints of the first pinnule, and the occurrence of a 

 genital gland on the second and of an oblique opposing spine on the 

 penultimate joint of the cirri distinguish this genus at once from all 

 others. The species are almost all small, reaching the maximum size, in 

 common with Psathyrometra and Heliometra, in the northern part of the 

 Sea of Japan. The species referable to this genus are, 



T. abyssorum (P. H. Carpenter). T. isis (A. H. Clark). 

 T. alternata (P. II. Carpenter). T. Isevis (P. II. Carpenter). 



T. comaster (A. II. Clark). T. longipinna (P. H. Carpenter). 



T. exigua (P. II. Carpenter). T. parva A. H. Clark. 



T. hirsuta (P. H. Carpenter). T. parvula ( Hartlaub). 



T. remota (P. H. Carpenter). 



Coccometra gen. no v. 



Genotype. — Comatula hagenii Pourtales, 1869. 



Radial facets with long, narrow, triangular muscular fossa', separated 

 from the interarticular ligament fossa' by a strongly diagonal ridge; the 

 radial face is considerably longer than broad, and almost wedge-shaped 

 in outline. Centro-dorsal low-hemispherical, a rather large area at the 

 pole hare and papillose. Thirty to fifty cirri with fifteen to twenty joints, 

 proximally two or three times as long as broad, gradually becoming 

 shorter distally, the terminal few not being greatly longer than broad; no 

 dorsal spines; opposing spine obsolete. Radials not projecting beyond 

 the centro-dorsal; lirst costals very short, almost hidden in the median 

 line by a posterior extension of the costal axillaries; there is a strong 

 constriction at the intercostal articulation ; costal axillaries longer than 

 wide, the anterior angle produced, and all the sides incurved. Ten arms 

 of moderately elongate joints. Lower pinnules long, approximately 

 equal in length, the lirst composed of very numerous short joints, very 

 delicate and flexible, the second and following with about half as many 

 joints, the proximal three short, the remainder becoming rapidly elon- 

 gated; the second and following pinnules hear large genital glands. 

 After the second and third the pinnules gradually decrease in length, then 

 become more slender and increase again, but do not reach the length of 

 the lirst four. 



Color. — Pale greenish, turning white in alcohol; or yellow, with a 

 median stripe of black, or with large round spots of Mack at the syzygia. 



Geographic distribution. — Caribbean Sea, north to Florida. 



Depth.— 82 to 242 fathoms (Carpenter). 



From the genus Thysanomelra, which also has the lirst pinnule coin- 

 posed of numerous short joints, and the second and following of elongated 

 joints, Coccometra may be most readily differentiated by the character of 



