A MONOGRAPH OF THE EXISTING CRINOIDS 309 



border. From about the ninth to the thirteenth brachials the distal edges are turned 

 downward, without becoming typically liplike. At about the eighteenth to twentieth 

 brachial the knoblike median tubercle becomes inconspicuous, and at the same time 

 the distal edge becomes lower and somewhat crenulate, later smooth and slightly 

 thickened. 



In arms arising from a IBr axdlary the first syzygy is between brachials 3+4, in 

 arms arising from a IIBr axillary, so far as may be judged from the few arms preserved, 

 between brachials 1 + 2. The second syzygy in arms arising from a IBr axillary is 

 between brachials 16 + 17 or 17+18, and the third from between brachials 22+23 to 

 between brachials 25+26; the distal intersyzygial interval is 6, 7, or 8 muscular articula- 

 tions. 



Pi is about 8 mm. long with about 20 segments of which the second-fifth are 

 broadened and carinate. None of the following pinnules are preserved entire. The 

 pinnules of the seventh and ninth brachials are 6-7 mm. long with 14 or 15 segments of 

 which the first 3 or 4 are short, those following elongate. The succeeding pinnules, in 

 the middle of the arm, are shorter, about 5 mm. long, with 10-12 segments of which 

 the first two are short and the remainder elongate; where gonads are developed the third 

 and fourth segments are broadened. 



The ambulacral plating consists of prominent side- and covering-plates. The 

 sacculi are colorless. The disk has been lost. 



The whole animal, in alcohol, is shining white except for the brownish dorsal pole 

 of the centrodorsal. 



Locality. — Blake station 101. 



Geographical range.- — Known only from northern Cuba. 



Bathymetrical range. — One record, 320-457 meters. 



CBINOMETRA BREVIPINNA Tar. POURTALESI (P. H. Carpenter) 



Antedon pourtalhsi P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, pp. 54, 208. 



209, 211, 212 (in key), 368, 379 (range). 

 Antedon brevipinna var. pourtaUsi Hartladb, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 323 



(in key), p. 339 (description; Blake station 219), pi. 14, fig. 1. 



Description.- — Hartlaub wrote that two specimens from Blake station 219 which 

 show little agreement either in the ornamentation of the brachials or in other respects — 

 as for instance the form of the IBr series — were distinguished by Carpenter in the 

 Challenger report as representatives of a new species which he called Antedon pourtaUsi. 



The characters of this new species as given by Carpenter in his key to the species 

 of the Spinifera group were: Cirri without definite arrangement on the centrodorsal, 

 composed of 15-25 stout and usually smooth segments; IIBr series and lower brachials 

 with distinctly flattened sides; calyx and arm bases irregularly tubercular; the pinnules 

 from the tenth to the twentieth brachials have the third-fifth segments flattened and 

 expanded laterally. In Carpenter's key brevipinna was said to differ from pourtaUsi 

 only in having the genital pinnules comparatively slender with very slightly expanded 

 segments. 



Hartlaub said that in studying the two type specimens of the so-called species 

 pourtaUsi he found in the larger, the only one he regarded as representing lus var. 

 pourtaUsi, that the genital pinnules began with P 2 . At first the gonads are situated 

 rather high on the pinnules, at about the height of the seventh and eighth segments, 



