PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 309 



During a visit to the station at Nanaimo, Dr. Th. Mortensen secured a number of 

 pentacrinoids which he described in great detail in 1920. 



[Note by A.M.C] In Mr. Austin Clark's paper of 1907, the name Ankdon 

 perplexa has page priority over A. serratissima, but, in view of the very brief description 

 of perplexa in the form of a comparison with asperrima, I do not dispute the use of the 

 name serratissima for this species. 



FLOROMETRA MARIAE (A. H. Clark) 



Figure 15 

 [See also vol. 1, pt. 1, fig. 311 (p. 269) ; pt. 2, figs. 292-293 (p. 221), 770 (p. 362)] 



Antedon mariae A. H. Clark, Proc. U.S. Nat. Mus., vol. 33, 1907, p. 77 (description; Albatross eta. 



5092); Bull. Inst. Oc&anogr., Monaco, No. 285, 1914, p. 3, footnote (t3rpe of Florometra). 

 Antedon hondoensis A. H. Clark, Proc. U.S. Nat. Mus., vol. 33, 1907, p. 78 (description; Albatross sta. 



5048); Unstalked crinoids of the Siboga-Exped., 1918, p. 243 ( = F. mariae). 

 Antedon laodice A. H. Clark, Proc. U.S. Nat. Mus., vol. 33, 1907, p. 75 (description; Albatross sta 



4969). 

 Heliometra hondoensis A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 351 (listed); Bull. 



Mus. Comp. Zool., vol. 51, No. 8, January 1908, p. 240 (compared with //. juvenalis [glacialis]) . 

 Heliometra laodice A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 351 (listed); Proc. 



U.S. Nat. Mus., vol. 34, 1908, p. 318 (Japan). 

 Heliometra mariae A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 351 (listed); Proc. 



U.S. Nat. Mus., vol. 34, 1908, p. 318 (Japan). 

 Florometra mariae A. H. Clark, Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, p. 215 (antarctic 



tjrpe; range and its significance); Die Crinolden der Antarktis, 1915, p. 141 {Albatross stas. 5092, 



3706), p. 142 (entrance to Tokyo Bay, 600 m.; Professor Doflein); Unstalked crinoids of the 



Siboga-Exped., 1918, p. 241 (in key; range), p. 242 (in key; range), p. 243 (synonymy), p. 244 



(discussion). — Gisl6n, Vid. Medd. Nat. Foren. K0benhavn, vol. 83, 1927, p. 3 (Dr. Mortensen's 



sta. 15; 720 meters), p. 49 (notes), p. 68 (listed), figs. 43, 44, p. 44. 

 Florometra hondoensis A. H. Clark, Die Crinolden der Antarktis, 1915, p. 141 (Albatross stas. 5047, 



5048). 

 Florometra laodice A. H. Clark, Die Crinolden der Antarktis, 1915, p. 141 (Albatross sta. 4969); 



Unstalked crinoids of the Siboga-Exped., 1918, p. 241 (in key; range), p. 243 (synonymy), p. 244 



(discussion). 



Diagnostic features. — The length of the brachials, those following the third syzygy 

 being about as long as broad instead of markedly broader than long, separates this 

 species from serratissima to which, however, it is very closely related; the position of the 

 third syzygy is very irregular but it is often between brachials 16+17 mstead of between 

 brachials 14 + 15, which separates it from asperrima; the occurrence of dorsal processes 

 on the pro.ximal segments of the oral pmnules separates it from tanneri, while the bases 

 of these pinnules are not broadened as in magellanica. 



Descriptions oj the known specimens. — In the type of mariae the centrodorsal has a 

 conspicuous bare polar area which is not sunken. 



The cirri are about L, 60, 60 mm. in length; the earlier segments are elongate, the 

 distal short with faintlj^ indicated terminal dorsal spines. The cirri about the dorsal 

 pole are 35 mm. in length and are composed of about 30 segments. 



The radials are concealed by the centrodorsal except for a narrow border. The 

 IBri are short, about 4 times as broad as long. The IBra (a.xillaries) are about as long as. 

 or somewhat longer than, broad, triangular, with the middle of the pro.ximal border 

 raised into a slight tubercle and the pro.ximal edge and distal sides, like the borders of 

 the IBri, set with fine teeth. 



