A MONOGRAPH OF THE EXISTING CRINOID8 189 



The cirri are XXI, 25, 27, 28, and 30, from 25 to 30 mm. long; the longest seg- 

 ments, in the basal third, are nearly or quite as long as broad; the distal segments 

 are slightly broader than long, sometimes as much as one-third again as broad as long ; 

 the terminal 10 or 12 segments have a small and low median dorsal tubercle, some- 

 times scarcely noticeable until near the end of the cirrus. The opposing spine is 

 well developed and conspicuous. The cirri as a whole are stout, stouter than in 

 the other species of the genus, with approximately subequal segments. 



The IIBr series are 4(3+4). The IIIBr series are 4(3+4) externally, 2 internally. 

 IVBr series, when present, are 4(3+4). The division series resemble those of the 

 other species of the genus. 



The 41 arms of the type specimen are 140 mm. long, resembling those of related 

 species. 



P D is 18 mm. long, with 30 to 32 segments, which are nearly twice as broad as 

 long in the proximal half, becoming squarish in the distal third, and terminally twice 

 as long as broad. After the fourth or fifth the segments develop strongly everted and 

 produced distal edges, this character gradually dying away in the distal third; this 

 eversion is smooth and not serrate. The proximal pinnules are very stout, but also 

 very long, and taper distally to a flagellate tip as in //. magnipinna; but the eversion 

 of the distal ends of the segments is much greater than in that species, and the cirri 

 are much stouter. 



Notes. Another specimen has the cirri XXXV, 27-29. There are 51 arms. As 

 in the type specimen the division series are strongly convex dorsally and well sepa- 

 rated. Only one of the division series, an internally developed IIIBr series, is 2, all 

 the others being 4(3+4). The proximal pinnules are exactly as in the type, and 

 are 18-21 mm. long. 



Locality. Kolumaduli, Maldive Archipelago; 69 meters; Prof. J. Stanley Gar- 

 diner [Bell, 1902; A. H. Clark, 1912, 1913] (2, B. M.). 



History. The two specimens upon which this species is based were originally 

 recorded by Prof. F. Jeffrey Bell under the name of Antedon palmata in 1902. I ex- 

 amined them at the British Museum in 1910 and described them as representing a 

 new species, Himerometra sol, in 1912. They were redescribed in my notes on the 

 crinoids of the British Museum in 1913. 



HIMEROMETRA MAGNIPINNA A. H. Clark 



PLATE 15, FIGURES 54, 55; PLATE 16, FIGURE 56; PLATE 17, FIGURES 61, 62. 



[Sec also vol. 1, pt. 2, fig. 260 (arm), p. 205; fig. 271 (arm and pinnules), p. 207; fig. 715 (disk) 



p. 346.] 



Antedon crassipinna (part) HARTLAOB, Nachr. Ges. Gottingen, May 1890, p. 185 (specimen from 

 Cochinchina, but not described specimen from Amboina [ = H. robustipinna}) ; Nova Acta Acad. 

 German., vol. 58, No. 1, 1891, p. 32 (specimen from Cochinchina, but not those from Amboina), 

 p. 34 (characters of proximal pinnules), not pi. 1, figs. 1, 5, 10 = /f. robustipinna. GISLEN, 

 Kungl. Fysiogr. SaUsk. Lund Forh., vol. 7, No. 1, 1936, p. 2 (Cochinchina), p. 4 (French 

 Indochina) . 



Himerometra crassipinna A. H. CLARK, Smithsonian Misc. Coll., vol. 50, 1907, p. 356 (in part; 

 listed) ; Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 (listed) ; Crinoids of the Indian Ocean, 

 1912, p. 116 (record from Cochinchina). 



