Clark — New Genera and Species of Crinoids. 221 



Centro-dorsal a very thin pentagonal plate, scarcely raised above the 

 surface of the radiala ; three of the basal joints of a single cirrus remain. 



Arm bases united to, and including, the first distichal, but well separated 

 from that point onward ; distichals, palmars, and post-palmars (five of the 

 last are present) 4 (3+4) ; a single distichal series and three palmar series 

 2. Forty-five arms 195mm. long, of short triangular or wedge-shaped 

 joints, over twice as broad as long, with everted distal ends. 



Lower pinnules not especially long or stout; P D 23mm. -25mm. long with 

 about sixty joints; P P 20mm. long; Pj 17mm. long; P 2 10mm. long. 



Color (in spirits). — Dark brown. 



Type locality. — Bowen, Queensland. 



Type, in the collection of the University of Copenhagen. 



Comanthus decameros sp. nov. 



Centro-dorsal discoidal, bearing numerous marginal cirri in roughly 

 three irregular and crowded, more or less alternating rows. 



Cirri xi., 16-17, 20mm. long; first joint very short, second slightly 

 longer than broad to about twice as long as broad, the third to the sixth 

 two and one-half to three times as long as broad, then decreasing in 

 length, the last two joints being squarish; opposing spine represented by 

 a low tubercle; terminal claw about as long as penultimate joint, moder- 

 ately stout, and moderately curved. 



Ends of basal rays very prominent in the angles of the calyx; radials 

 concealed ; first costals short, oblong, widely free laterally ; costal axillaries 

 broadly pentagonal, about twice as broad as long. Ten arms 125mm. 

 long; first seven or eight brachials slightly wedge-shaped, then triangular, 

 about as long as broad; in the outer portion of the arms the brachials 

 have projecting and finely spinous distal ends. Syzygies occur between 

 the third and fourth brachials, again hetween the thirteenth and four- 

 teenth to seventeenth and eighteenth (usually nearer the former), and 

 distally at intervals of three to five (usually three or four) oblique muscu- 

 lar articulations. The arms are rugged and tubercular basally, but are 

 not enlarged or swollen. 



Pj 23mm., P 2 20mm., P 3 15mm., and P 4 10mm. in length, the last with 

 a genital gland; the following pinnules increase gradually in length, 

 reaching 22mm. distally. The distal dorsal end of the proximal pinnule 

 joints of the lower four or five pinnule pairs is prominent, giving these 

 pinnules a serrate dorsal outline basally; the distal ends of all the pinnule 

 joints are projecting and finely spinous. The teeth on the terminal comb 

 on the proximal pinnules are low and rounded ; the comb is not found after 



Color (in spirits). — Brownish yellow, the cirri lighter, the perisome 

 darker. 



Type locality— 32° 22' N. lat., 128° 42 / E. long., off the Goto Islands, 

 neai* Nagasaki, Japan; 170 fathoms. 



Type, in the collection of the University of Copenhagen. 



The only species with which this could be confused is C. cumingiioi the 

 East Indies ; but the large number of long cirri with comparatively numer- 



