86 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



with the distal border rather strongly concave and the distal edge strongly thickened 

 and produced and armed with very numerous excessively fine teeth. 



P! is 7 mm. long and is composed of 1 7 segments. It is moderately stout at the base, 

 but tapers rather rapidly in the first nine segments and becomes slender from that point 

 onward. The first two segments are about twice as broad as long and those following 

 gradually increase in length, becoming about as long as broad on the fifth and sixth, 

 and somewhat more than twice as long as broad distally. The segments are sharply 

 carinate. 



P 2 is 9.5 mm. long with 18 segments. It is not quite so stout basally as P! and tapers 

 much more gradually. The segments are at first broader than long, becoming about as 

 long as broad on the fourth and twice as long as broad in the outer portion. The seg- 

 ments are sharply carinate, and in the distal half this carination is high and the distal 

 angle is distally produced, considerably overlapping the base of the segment succeeding. 



P 3 is 8.5 mm. long with 15 segments. It is about as broad basally as P 2 , but tapers 

 very gradually and evenly to the tip so that in its distal half it is twice as broad as 

 P 2 . The segments become as long as broad on the eighth and are distally about half 

 again as long as broad. 



P 4 is 9 mm. long with 16 segments, resembling P 3 but tapering still more gradually 

 and hence broader throughout with relatively shorter segments. 



On some arms P l may be twice as broad basally as P 2 , though becoming more slender 

 in the distal half, while on others there is very little difference between them. On the 

 other arms PI and P 2 may be relatively small, the former very slightly stouter basally 

 than the latter, and P 3 may be much longer and broader than either. 



Locality. Malay Archipelago; from a cable; cable repair ship Patrol, Eastern and 

 Associated Telegraph Co. [A. H. Clark, 1929] (1, B.M.). 



PARAMETRA FISHERI (A. H. Clark) 



PLATE 9, FIGURE 28 

 [See also vol. 1, pt. 1, fig. 365, p. 297; pt. 2, fig. 218, p. 164.] 



Thalassometrafisheri A. H. CLARK, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 214 (in key), p. 223 (descrip- 

 tion; Albatross station 4122). 



Parametra fisheri A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 16 (listed); Crinoids of 

 the Indian Ocean, 1912, p. 213 (synonymy; locality); Unstalked crinoids of the Siboga-Exped., 1918, 

 p. 158 (in key; range; references); Journ. Linn. Soc. (Zool.), vol. 36, No. 249, April 1929, p. 649 

 (compared with P. ajax); Bernice P. Bishop Mus. Bull. 195, 1949, p. 74 (Albatross station 4122), 

 p. Ill (station data). 



Diagnostic features. -The arms are evenly rounded dorsally; PI is basally much 

 enlarged, tapering to a slender distal portion; and the cirri are rather long, about one- 

 quarter of the arm length, with the transition segment the fifth and the distal segments 

 about as long as broad wdth prominent dorsal spines. The 13 arms are 110 mm. long, 

 and the cirri are 20-25 mm. long with 19-26 segments. 



Description. The centrodorsal is low hemispherical with a rather large polar area 

 bare. The cirrus sockets are arranged in 2 irregular marginal rows and 2 irregular 

 columns in each radial area. 



The cirri are XV, 19-26 (usually nearer the latter) from 20 mm. to 25 mm. in 

 length. The first 2 segments are short, the third is not quite so long as broad, the fourth 



