A MONOGRAPH OF THE EXISTING CRINOIDS 311 



the ornamentation is mostly of usually blunt tubercles, which are exceedingly few. 

 Only the IBn is beset with numerous tubercles, among which a larger rounded median 

 tubercle especially stands out. Except for this, there is only a slight tuberculation on 

 the lateral borders of the ossicles, or in their vicinity, as far as the IIIBr series where 

 it becomes quite inconspicuous. Besides this, the proximal border of the axillaries 

 is tubercular or slightly corrugated. The rest of the dorsal surface of the division 

 series is smooth and only shows a median swelling which does not form a median ridge. 

 On the lowest brachials ornamentation is only indicated. The produced distal ends 

 of the following brachials are thickened and with few exceptions smooth; there is no 

 formation of typical recurved lips such as are present in var. tuberosa. Here, and 

 toward the arm tips, a median sharpening of the brachials, a sort of carination, may 

 sometimes be distinguished. 



The first syzygy lies at the same height on all the arms. On the arms arising from 

 a IIBr axillary the first syzygy is between brachials 3+4, on arms arising from a 

 IIIBr axillary between brachials 11 + 2. The second syzygy in arms arising from a 

 IIBr axillary is from between brachials 16 + 17 to between brachials 27+28, and on 

 arms arising from a IIIBr axillary from between brachials 15 + 16 to between brachials 

 35+36; but in the latter case there may be syzygies between brachials 4 + 5, 5 + 6, 

 and 9+10. In arms arising from both IIBr and IIIBr axillaries the distal intersyzygial 

 interval is from 9 to 20, usually 12-16, muscular articulations. 



Pi is about 10 mm. long with 25-30 short and approximately quadrangular segments 

 of which the first five are broad and feebly carinate. The pinnules following are shorter. 

 The pinnules in the middle of the arm are 5-6 mm. long with 12-13 segments of which 

 the first two are both short, those following elongate. Gonads are usually present, 

 roofed over by the modification of the segments already described. Individual gonads 

 occur nearly to the arm tips. Here the pinnules are very slender, apparently some- 

 what longer, and are composed of about 15 segments. 



The arms are estimated as about 120 mm. in length. 



The ambulacra! plating is composed of rather large side and covering plates. 

 The sacculi are rather small. The disk is typically rather deeply incised, 15 mm. in 

 diameter. In alcohol the disk is light gray, the skeleton gray with a yellowish tinge, 

 the centrodorsal and base of the postradial series somewhat darker. 



Locality. — Blake station 219. 



Geographical range. — Off St. Lucia; according to Carpenter "Caribbean Islands." 



Bathymetrical range. — The only definite record is 276 meters; Carpenter gives the 

 range as 227-479 meters. 



Thermal range. — One record, 13.89° C. 



CRINOMETRA BREVIPINNA Tar. LAEVIS (Hartlaub) 



Antedon bretnpinna var. Ism') Hartlaub, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 323 (in 

 key), p. 342 (description; Blake station 269), pi. 11, fig. 6. 



Description. — A medium-sized specimen, unfortunately mutilated, from Blake 

 station 269 was considered by Hartlaub as a representative of a special variety showing 

 some characteristic features. 



The centrodorsal is subhemispherical, low, with a rounded bare dorsal pole studded 

 with coarse tubercles, which are also found between the cirri and especially on the well 

 developed interradial processes. 



