TWO NEW CRINOIDS FROM THE NORTH PACIFIC OCEAN. 



By Austin H. Clark, 



Of the United States Bureau of Fisheries. 



The remarkable crinoid which is described below was obtained by 

 the U. S. Fisheries steamer Alhotnm on August 30, 190(>, in 33^ 23' 30" 

 north latitude, 135- 34' 00" east longitude, Shio Misaki light, south 

 coast of Nipon, Japan, bearing N. 75° E., 9.6 miles distant, the station 

 being No. 4071. The bottom temperature was 38.1 F. (corrected), 

 the depth 649 fathoms, with a bottom of brown and green mud, with 

 numerous foraminifera. 



PHRYNOCRINUS Clark, new genus. 



The characters of this genus are included in the diagnosis of the 

 type species as follows: 



Type of the genui^. — Phri/iiocrhni.^ nudus Clark. 



PHRYNOCRINUS NUDUS Clark, new species. 



Type.—C^. No. 22601, U.S.N.M. 



The general aspect of the calyx is quite different from that in any 

 known crinoid. In shape it is somewhat like an acorn, expanding 

 rapidly from the top of the stem to about the fourth radial, where it 

 attains a maximum width of 29 mm., gradually becoming narrower 

 again in the region of the axillaries. Probably in life, howeyer, the 

 sides of the calyx are parallel or slightly diverging from the fourth 

 radial upward. The most characteristic feature of the calyx is the 

 broad naked space between the radials, which is equal in width to 

 twice the diameter of the radials themselves, and is covered with a 

 tough, leathery integument, in which as yet I have not succeeded in 

 making out any interradial plates whatever, although they may occur 

 deeply embedded in the skin. The radials are small, and are subequal 

 in size, the largest being the fourth or fifth in each arm, from which 

 point the size diminishes in each direction; their number is very large, 

 in one arm 18, including 7 syzygies, so that the total number of indi- 

 vidual joints is 25. The radials radiate out from the very small basals, 



Proceedings U. S. National Museum, Vol. XXXll— No. 1543. 



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