132 Clark — New Genera of Unstalked Crinoids. 



six or eight times as broad as long ; costal axillaries rhombic, as broad as 

 or broader than Long; the costals are in close apposition, and may he 

 laterally flattened. Ten arms, the joints (except the proximal, which 

 are transversely oblong or squarish), triangular or obliquely quadrate, 

 about as long as wide, becoming more elongate distally. The first pin- 

 nule is exceedingly slender, half again as long to three times as long as 

 the stouter second pinnule, composed of much elongated joints, especially 

 distally where they are slender and threadlike, with the distal ends much 

 expanded. 



Color. — Yellow. 



Geographic distribution. — Bahama Islands to Savannah, Georgia ; 

 Hawaiian Islands, about Molokai and the southern part of Oahu, and oft' 

 Maui. 



Depth.— 270 to 440 fathoms. 



The peculiar, long and slender first pinnule and the short costals, 

 together with the numerous cirrus joints wdiich are short distally, the 

 short opposing and long terminal spine, the latter but little curved, at 

 once distinguish this genus. The only known species are, 



T. aspera (A. II. Clark). T. vexator (A. II. Clark). 



Bathymetra gen. nov. 



Geiiott/pe. — Antedon abyssicola P. H. Carpenter, 1S88. 



Centro-dorsal small, hemispherical, the cirrus sockets rather small and 

 well separated, arranged more or less regularly in fifteen columns, one to 

 three to a column. Fifteen to forty-five cirri with eight to fifteen joints; 

 first joint short, second longer than broad, usually considerably elongated, 

 the following joints gradually decreasing in length distally; all the joints 

 have enlarged and Haring distal ends; there are no dorsal spines, but the 

 opposing spine is always well developed, triangular, its distal edge vertical, 

 its proximal edge straight, running from the anterior end of the penul- 

 timate joint to the tip of the spine. Radials always visible, usually for 

 a large part of their length, strongly concave on their anterior border, 

 strongly produced in the interradial angles where they partially or entirely 

 separate the first costals ; costals and lower brachials in close apposition 

 laterally, and more or less flattened ; the costals and the joints of the ten 

 arms are all rather long, the latter with a concave surface, making the 

 ends prominent. Tin- lower pinnules appear to be slender, with the first 

 shorter than the second. 



Color. — Light grayish brown. 



Geographic distribution. — Bering Sea southward to the Antarctic Ocean, 

 north in the Atlantic to the Abrolhos Islands, oil' the coast of brazil. 



Depth.— 818 to 2,900 fathoms. 



The elongation of the second cirrus joint and the interradial processes 

 of the radials distinguish this genus at once from all others. The included 

 species are, 



B. abgssicola (I*. II. Carpenter). II. carpenteri A. II. Clark. 



//. brevicirra A. H. Clark. /.'. minutixxima A. II. Clark. 



