A MONOGRAPH OF THE EXISTING CRINOIDS 553 



of PI have the side opposite that bearing the long processes thickened and armed with 

 very numerous short spines, giving a strongly serrate profile. This feature decreases 

 and disappears at about the end of the proximal third of the pinnule. On P 2 , which 

 is much smaller than P b the processes on the distal side of the earlier segments are 

 narrower than those on PI and are curved more or less toward the pinnule tip. The 

 processes on the opposite side of the segments are strongly developed. The comb 

 consists of about 16 teeth which are high but very narrow, those at the tip of the 

 pinnule becoming very small. P 3 resembles P 2 . On P 4 and the following pinnules 

 the processes on the side of the basal segments toward the arm base are absent, but 

 those on the side toward the arm tip are strongly developed. These persist, in the 

 form of spinous crests, to the terminal pinnules. 



Another specimen has 40 arms. All of the division series are 4 (3 + 4). The 

 dorsal pole of the centrodorsal is 7.5 mm. in diameter. The cirri have 29-30 segments. 



In a specimen with 38 arms all the division series are 4 (3 + 4). The longest 

 cirri have 34-38 segments and are up to 50 mm. long; most of the cirri have about 30 

 segments, and the smaller may be only 15 mm. long with 15 segments. 



A specimen with 31 arms has the cirri with 18-21 segments. 



In a specimen with 27 arms all the division series are 4 (3 + 4). The longest 

 cirri have 28-32 segments. 



Localities. East of Flinders Island, Bass Strait, between Australia and Tas- 

 mania; 183-548 meters; Endeavour, December 3, 1913 [H. L. Clark, 1916] (2, M. C. Z., 

 710; Austr. M.). 



Endeavour; off the coast of Gippsland, Victoria, southwest of Rame Head (lat. 

 38 15' S., long. 149 20' E.); 274-475 meters; September 19, 1914 (5). PI. 23, fig. 

 62; pi. 69, figs. 190, 191. 



Remarks. As Doctor Clark says, this is a very well characterized and remarkable 

 species of Comanthus which is related to C. bennetti and to C. pinguis, though easily 

 distinguishable from both by the curious pinnule segments. The small number of 

 arms and the color will further distinguish it from C. bennetti, while the shape of the 

 arms, especially at the base, separate it from C. pinguis. From the south Australian 

 C. trichoptera and its allies the size, the cirri, and the pinnules all sharply distinguish it. 



COMANTHUS PINGUIS A. H. Clark 



Plate 70, Figures 192, 193; Plate 71, Figure 194 



[See also vol. 1, pt. 1, fig. 68 (section of centrodorsal and radial pentagon), p. 93; figs. 171, 172 



(centrodorsal), p. 231; fig. 329 (cirrus), p. 281; pt. 2, fig. 248 (aim), p. 199; fig. 386 (pinnule 



tip), p. 245; fig. 701 (disk), p. 341] 

 Actinometra, sp. McCLBNooN, Bull. American Mus. Nat. Hist., vol. 23, 1906, p. 123 (Suruga Gulf 



and Sagami Sea; myzostomes). 



Actinometra robustipinna A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1908, p. 684 (type of inter- 

 costal union). 

 Comaster robuMpinna A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1908, p. 686 (listed); vol. 34, 



1908, p. 305 (various localities in Sagami Bay; Suruga Gulf). 



Phanogenia robutlipinna A. H. CLARK, Pioc. U. S. Nat. Mus., vol. 35, 1908, p. 124 (listed). 

 Comanthus robustipinna A. H. CLARK, Zool. Anzeiger, vol. 34, No. 11-12, 1909, p. 366 (listed). 



