A MONOGRAPH OF THE EXISTING CRINOIDS 319 



segments, which become as long as broad on the sixth and twice as long as broad 

 terminally. The outer surface of the pinnule from about the sixth segment onward 

 is sharpened or gabled in the median line, and there is a slight sharpening of the distal 

 border of the basal segments. P 3 resembles P 3 but is longer and noticeably stouter, 

 especially in the outer half. P 4 may resemble P 3 or it may be shorter and more rapidly 

 tapering than P 2 . P s is 11 mm. long, with 22 segments, tapering rather rapidly in the 

 proximal half, with the distal half slender and delicate. The following pinnules 

 resemble P s . The proximal segments of the proximal and middle pinnules are not 

 carinate; at most they are slightly gabled or sharpened on the distal border. 



Locality. Danish Expedition to the Kei Islands; Dr. Th. Mortonsen; Amboina; 

 about 2 meters; February 9, 1922 (1, C. M.). 



Remarks. This species seems to be very distinct from any previously described, 

 the entirely smooth, enlarged, and much stiffened proximal pinnules, the very slight 

 carination on the basal segments of the lower pinnules, and the exceedingly short 

 elements of the division series and brachials distinguishing it at once. 



HETEBOMETBA PARILIS (A. H. Clark) 



PLATE 35, FIGURES 157-160 

 [See also vol. 1, pt. 2, fig. 796 (ambulacral deposits), p. 372.] 



Himerometra bengalensis A. H. CLARK, Smithsonian Misc. Coll., vol. 52, 1908, p. 214 (Albatross 

 station 5146). 



Amphimelra parilis A. H. CLARK, Proc. U. S. Nat. Mus., vol. 37, 1909, p. 32 (description; Albatross 

 station 5147); Crinoids of the Indian Ocean, 1912, p. 112 (synonymy; locality); Unstalked 

 crinoids of the St&offa-Exped., 1918, p. 82 (in key; range), p. 84 (references; localities from 

 which known). 



Heterometra bengalensis A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 130 (in part; Philip- 

 pines); Monograph of the existing crinoids, vol. 1, pt. 2, 1921, p. 240, fig. 796, p. 372 (ambulacral 

 deposits); Smithsonian Misc. Coll., vol. 72, No. 7, 1921, pi. 2. fig. 21 (ambulacral deposits; 

 figure from preceding). 



Diagnostic features. There are no IIIBr series. The brachials are exceedingly 

 short, and those in the proximal portion of the arm have the proximal end elevated so 

 that the profile of the earlier portion of the arm is regularly serrate with the teeth 

 directed proximally. The profile of the outer two-thirds of the arms is smooth. The 

 cirri are 25-30 mm. long and are composed of 30-33 segments, of which the longest 

 are nearly as long as broad and the outer are about twice as broad as long with promi- 

 nent median dorsal spines. The 10-16 arms are 100-150 mm. long. The carination 

 on the earlier segments of the lower pinnules is strongly marked, though not exag- 

 gerated. 



Description. The centrodorsal is thick discoidal with the bare polar area flat 2.5 

 mm. in diameter. The cirrus sockets are arranged in one and a partial second crowded 

 and irregular marginal rows. 



The cirri are XII, 30-33, 25 to 30 mm. long, moderately stout. The segments 

 are subequal in length, all broader than long. They are at first very short, slowly 

 increasing in length to the seventh or eighth, which, with the three or four following, 

 is about half again as broad as long, then very slowly decreasing so that the segments 

 in the distal half of the cirri are about twice as broad as long. The twelfth and fol- 

 lowing segments have prominent median dorsal spines which are directed distally. 



