A MONOGRAPH OF THE EXISTING CRINOIDS 459 



upon which the Torres Strait record was based was the one described by Hartiaub 

 in 1891. 



In 1928 Dr. Torsten Gislen published notes on the type specimen of Carpenter's 

 Antedon marginata which he had examined in the British Museum in 1925. 



In November 1938, Miss Lee Boone recorded this species from Bali, where it 

 had been taken by William K. Vanderbilt during a cruise on his yacht Alva. The 

 single specimen was recorded under the name of Lamprometra protectus. The 

 references, synonymy, and color notes all refer to Lamprometra palmata. 



PELOMETRA, gen. nov. 



Diagnosis. — A genus of Mariametridae in which the genital pinnules have a 

 narrow expansion on the lower edges of the segments; the cirri have less than 35 seg- 

 ments, of which the distal are sharpened in the middorsal line but are without dorsal 

 processes; the proximal pinnules are enlarged and stiffened but are without spiniform 

 tips, P 3 being the longest; the lateral edges of the elements of the division series are 

 smooth, but abruptly swollen; the division series are not carinate; and the disk is 

 naked. 



Genotype. — Pelometra ambonensis, sp. nov. 



Geographical range. — Known only from Amboina. 



Bathymetrical range. — The only record is about 91 meters. 



PELOMETRA AMBONENSIS, sp. nov. 



Plate 51, Figures 235-237 



Description. — The centrodorsal is discoidal, with the dorsal pole flat and marked 

 about the periphery near the bases of the cirri with cirrus scars each containing a 

 flattened boss representing obsolete cirrus sockets. The cirri are arranged in two 

 irregular marginal rows. 



The cirri are XXIV, 25-30 (usually 25-26), 20 to 23 mm. in length. The first 

 segment is very short, the second is twice as broad as long, and those following increase 

 in length to the sixth or seventh, which is half again as long as broad. The distal 

 segments decrease slightly in length, the antepenultimate being only one-third or 

 one-quarter again as long as broad. The last 12 to 15 segments have the middorsal 

 line sharpened into a sharp gable, but this is not produced as a carinate ridge. The 

 cirri taper slightly in the last 8 or 9 segments so that the terminal segments are small. 

 The opposing spine is a small blunt terminal or subterminal tubercle. The terminal 

 claw is markedly longer than the penultimate segment and is rather slender, evenly 

 tapering, and moderately and evenly curved. 



The radials are visible only as a narrow line beyond the rim of the centrodorsal 

 and are completely in contact in the interradial angles. The IBr, are very short, 

 bandlike, about eight times as broad as long; they are curved slightly downward in 

 the midradial line, and are in contact laterally. The IBr. (axillaries) are rhombic, 

 with the distal angle more produced than the proximal, short, about twice as broad 

 as long, with the proximal and distal sides concave; the slightly truncated lateral 

 angles are abruptly swollen and are in lateral contact. There is a rather strongly 



