A MONOGRAPH OF THE EXISTING CRINOIDS 303 



Caroline station 35, off the west coast of Puerto Rico (lat, 18°24'45" N., long. 67°14'15" 

 W.), in 146-329 meters. 



Pentacrinoid. — A pentacrinoid larva referred to this species by Professor Gislen 

 is about 3.4 m. long. The calyx is composed chiefly of orals and basals. Small radials 

 appear in the angles between the orals and basals. The orals have everted lateral 

 borders. There are 9 columnals, including the terminal stem plate. The two first 

 columnals are short, the second being wider than the stem. The third and fourth, 

 according to Gislen, are apparently double; they are from half again to twice as long 

 as broad. The fifth and sixth are very long, from three to four times as long as broad. 

 The seventh is much shorter, and the eighth is one-third again as long as broad. The 

 ninth is a short disk attached to a dead Lophohelia.. 



Professor Gislen said that as no comatulid except Crinometra transversa is known 

 from this depth in the vicinity of St. Helena this pentacrinoid may be the larva of this 

 form; though the possibility of a species of the family Thalassometridae occurring here 

 cannot be denied. 



Localities— Oft St. Helena; 2 miles S. 49° E. from Long Range Point; 280-360 

 meters; hard bottom; Dana, February 24, 1930 [Gislen, 1933]. 



St. Helena; 2 miles off Bay Point; 480 meters; Dana, February 24, 1930 [Gislen, 

 1933]. The pentacrinoid larva came from this locality. 



History. — This variety was described and figured by Prof. Torsten Gislen in 1933 

 from a specimen that had been dredged by the Danish research steamer Dana in 1930 

 and sent him by Dr. Th. Mortensen. He gave notes on another specimen taken with 

 the type specimen, and described and figured a pentacrinoid which he referred to this 

 species. 



CRINOMETRA BREVIPINNA Tar. TUBEROSA (Hartlaub) 



Antedon brevipinna var. tuberosa Hartlaub, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 322 

 (in key), p. 333 (description; Blake stations 198, 219; no locality), pi. 11, fig. 3. 



Description. — Hartlaub referred to this variety three specimens without locality, 

 one from Blake station 219, and one from Blake station 198. The three specimens 

 without locality are of similar size with the arms about 125 mm. long; the specimen 

 from Blake station 219 is similar to these, but stouter; that from Blake station 198 has 

 the arms about 115 mm. long. The three without locality agree perfectly in all their 

 characters and are remarkable for the small calyx and long and slender arms — about 

 120 mm. long from the last axillary. 



In all five specimens the contrasting coloration seen in var. pulchella and var. 

 concinna (elegans) is absent. In general they are light in color. The centrodorsal and 

 a few ossicles of the division series are only here and there more darkly colored. 



In all five the ornamentation of the division series shows larger and smaller, some- 

 times sharp, sometimes blunt tubercles which are distributed without special affinity 

 to the borders of the ossicles, in contrast to the conditions seen in var. concinna, although 

 here and there, especially on the edges of the axillaries, there may be a typical serration. 

 Noteworthy is the regular presence of a median tubercle of varied form, or a medium 

 ridge, and in addition the production of the dentate, serrate, or crenulate proximal 

 border of the rhombic IBr axillary. 



In contrast to var. pvlchella and var. concinna, the tubercles are larger, giving the 

 general ornamentation of the division series a coarser character. Between the cirri 



