NO. IGOl. S^EVFINTEEN NEW SFECFES OF CRINOWB— CLARK. 635 



^Tadiially decreasing in length to 5 mm., then very slowly increasing, 

 reaching a length of 10 mm. distally. The distal ends of the joints 

 of the lower pinnules are more or less produced and spinous. 



Type-,spen7>u'„.—Q.'Ai. No. TC, Indian Museum; lat. 14° 04' 30" 

 N.;"long. J);i° 51' 00" E. ; 41 fathoms. 



Cotype.— Cut No. 25478, U.S.N.M., from the same locality. 



Family IITMEROMETRID^. 

 Genus AMPHIMETRA A. H. Clark. 



AMPHIMETRA MORTENSENI, new species. 



Centro-dorsal thick-discoidal, the bare polar area flat, 4 mm. or 

 5 nnn. in diameter; cirrus sockets arranged in two closely crowded 

 alternating marginal rows.' 



Cirri XVIII-XX, 30^2 (usually about 35), 25 mm. to 30 mm. 

 long; first joint short, about three times as broad as long, second and 

 third about twice as broad as long, the following gradually increas- 

 ing in length to the ninth or tenth, which is nearly, though never 

 quite, as long as broad ; next five to seven joints similar, the following 

 gradually decreasing in length, in almost the whole of the terminal 

 half of the cirrus being about one-half again as broad as long; from 

 the twelfth or fourteenth onward sharp median tubercles or small 

 spines are developed on the dorsal side of each joint, those on the 

 last few^ joints occupying a position slightly jDroximal to median; 

 opposing spine much larger than the processes on the preceding 

 joints, triangular, the apex median, arising from very nearly the 

 whole of the dorsal surface of the penultimate joint, equal to about 

 half the diameter of that joint in height; terminal claw longer than 

 the penultimate joint, moderately stout basally, but gradually be- 

 coming slender distally, moderately curved. 



Radials concealed, or just visible beyond the centro-dorsal; IBr^ 

 oblong, very short, in close lateral apposition; IBr^ (axillary) very 

 broadly pentagonal, almost triangular, the lateral edges not quite 

 so long as those of the IBr^, about two and one-half times as broad 

 as long; IIBr 4 (3-1-4); IIIBr 4 (3-|-4) ; division series and first 

 tW'O brachials in close lateral apposition and laterally flattened, the 

 dorsal carination only of Pd being visible exteriorly; synarthrial 

 tubercles usually prominent. 



Twenty to twenty-five arms 150 mm. long; first brachial slightly 

 wedge-shaped, short, about three times as broad as its exterior length, 

 almost entirely united interiorly; second about the same size, but 

 more pronouncedly wedge-shaped; third and fourth (syzygial pair) 

 oblong, half again as broad as long; next five or six brachials oblong, 

 nearly or quite four times as broad as long, then slowly becoming 

 wedge-shaped and then almost triangular, four times as broad as 

 long, soon becoming wedge-shaped again, and in the outer half of 



