A MONOGRAPH OF THE EXISTING CRINOIDS 577 



P D is 25 mm. long, moderately stout basnlly but becoming slender after the 

 proximal third. The terminal comb has 10-13 small and rounded, well separated 

 teeth. P P and PI are similar, only slightly if at all shorter than P D , and only slightly 

 less stout basally. P 2 is much more slender, 12 mm. long. P 3 is small and weak, 

 about 7 mm. long. P 4 and the following pinnules are somewhat stouter, with long 

 gonads, 10 mm. long. The distal pinnules are slender, 12 or 13 mm. long. The 

 segments in the proximal third or half of the pinnules are produced into a spinous 

 carination, this feature gradually disappearing on the distal pinnules. 



The color in alcohol is dark purple with the disk, cirri, and pinnules brownish 

 yellow and the arms with a lighter modian line, or yellow or brown. 



Remarks. Notwithstanding the highly characteristic appearance of typically 

 developed individuals, intergrades occasionally are found between this species and 

 both C. pinguis and C. japonica. It can not be confused with any other species of 

 Comanthus, but a specimen without locality might possibly at first be mistaken for 

 Comanthina schlegelii. 



Notes. The specimens from Mortensen's station 10 show the following char- 

 acters. 



The centrodorsal is pentagonal, 5.5 mm. in diameter. The free dorsal pole is 

 4 mm. across. 



The cirri are XXIX, 19-21, from 15 to 20 mm. in length. The fifth-seventh 

 segments are the longest, from one-half to three-quarters again as long as broad. 

 From the tenth onward dorsal processes are developed. 



The 21 arms are 70 mm. long. The 10 IIBr series and the single IIIBr series 

 are 4 (3 + 4). The width of the IIBr, is 2.8 mm. The interspace between the IIBr 

 series is 0.4 mm. broad. The division series are very high and arched dorsally, and 

 are in close lateral contact. The IBri is ten times as broad as long, and the IBr 2 

 (axillary) is three times as broad as long. 



The intersyzygial interval is 4 muscular articulations. 



P D has a comb consisting of 12 teeth. The pinnules following as far as P 4 bear 

 combs. The distal pinnules are from 6.5 to 7 mm. long. The 5 basal segments of 

 each pinnule have spiny tubercles directed aborally. 



The disk is 18 mm. in diameter. The color is yellow brown. 



The centrodorsal is rounded, 6.5 mm. in diameter, with the free dorsal pole 5.5 

 mm. in diameter. 



The cirri are XXVIII, 20-21, from 15 to 17 mm. long. 



The 20 arms are 60+ mm. long. The IBr! are concealed by the centrodorsal. 

 The IBr 2 (axillaries) are four times as broad as long. The width of the IIBr! is 3 mm. 

 The division series are very closely appressed and laterally flattened against each 

 other. 



P D has a comb consisting of about 10 teeth, which are short and inconspicuous; 

 the terminal segments are without teeth. It is 17 mm. in length. P 4 is 6.5 mm. in 

 length and bears a comb. The distal pinnules are from 9 to 9.5 mm. long. 



The disk is 17 mm. in diameter. The anal area is granulated. The anal tube 

 is wart-shaped, 5 mm. broad and 3 mm. high. 



The color is olive brown. 

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