A MONOGRAPH OF THE EXISTING CRINOIDS 377 



455'10" N., long. 11945'30" E.); 201 meters; coral; February 24, 1908 [A. H. 

 Clark, 1908] (2, U.S.N.M., 25445, 35524). 



Albatross station 5166; the same general locality; Observation Island bearing 

 N. 20 W., 4.6 miles distant (lat. 456'10" N., long. 11946'00" E.); 177 meters; 

 coral sand; February 24, 1908 [A. H. Clark, 1909] (1, U.S.N.M., 35525). 



Remarks. This species is known only from the three specimens collected by 

 the Albatross at two closely adjacent localities in the Philippines. 



PECTINOMETRA MAGN1FICA (A. H. Clark) 



PLATE 39, FIGURES 201, 202 

 [See also vol. 1, pt. 2, figs. 504, 505 (pinnule tip), p. 276; figs. 735, 736 (disk), p. 349.] 



Calometra magnified A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 77 (Malay Archi- 

 pelago, 160 fms.; description). 



Pectinometra magnified A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 185 (synonymy; detailed 

 description; locality), fig. 31, p. 186; Unstalked crinoids of the Siboga-Exped., 1918, p. 138 (in 

 key; range; references; detailed description; station 94; also Albatross station 5661), p. 272 

 (listed). 



Diagnostic features. The ossicles of the division series bear a prominent high 

 and narrow median keel; they are extended laterally in the form of thin lateral proc- 

 esses which just meet those of their neighbors; there are 41-48 cirrus segments and 

 20 arms 120 mm. hi length. 



Description. The centrodorsal is hemispherical with the bare polar area convex, 

 2 mm. in diameter. The cirrus sockets are arranged in two or three closely crowded 

 irregular marginal rows. 



The cirri are XX, 41-48, 40 mm. long. The first segment is short, the next two 

 are about twice as broad as long, and those following gradually increase in length to 

 the fifth or seventh which is about one-third again as broad as long. The following 

 segments are similar to almost the middle of the cirrus, at which point they begin to 

 decrease gradually in length, in the terminal portion being twice as broad as long. 

 At about the eighth segment the median portion of the distal dorsal edge begins to 

 project in a small V-shaped spine. This very slowly increases distally, the whole 

 dorsal surface of the segment becoming rounded carinate and rising at the same time 

 until in the terminal third of the cirri the segments bear broad spatulate carinate 

 processes which are equal in height to about one-third their width. The opposing 

 spine is triangular, similar in shape and size to the spine on the preceding segment, 

 blunt, the apex terminal, arising from the distal two-thirds of the penultimate seg- 

 ment, about equal to one-half the lateral width of the penultimate segment in height. 

 The terminal claw is conical, equal in length to the pentulimate segment, stout, and 

 slightly curved. 



The ends of the basal rays are visible as small, though prominent, tubercles in the 

 angles of the calyx. 



The distal borders of the radials are even with the rim of the centrodorsal. Over 

 the ends of the basal rays the radials are produced anteriorly in a narrow slightly 

 wedge-shaped (base upward) process which terminates distally in a spatulate tip 

 between the lateral edges of the axillaries. The IB^ are short, slightly trapezoidal, 



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