804 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



FIGURE 51. Pentamttrocrinus semperi (P. H. Carpenter), 

 syntype, Challenger station 164. 



O mm 



The genital pinnules arise from about the ninth brachial on. They have about 

 20 segments and measure about 11 mm. The gonad is short and extends from the 

 fourth to the seventh segments. The outer segments are about three times as long 

 as broad. 



The disk and arm bases are rather closely plated. 



The syntype from station 164, pronounced the type locality by Mr. Clark, has the 

 centrodorsal 2.5 mm. wide and 1.6 mm. high. There are XV cirrus sockets and the 

 dorsal pole is also pitted and irregular; Carpenter gives the number of sockets as 20 to 

 30, but some of these are definitely obsolete. All the pinnules are broken. The speci- 

 men is very similar in ah 1 respects to the one just described. 



Localities. Challenger station 164; off Port Jackson, New South Wales (lat. 3408' 

 S., long. 15200' E.); 1736 meters; temperature 2.50 C.; green mud; June 12, 1874 

 [P. H. Carpenter, 1882, 1887, 1888] (1, B.M.). Type locality. 



Challenger station 169; northeast of New Zealand Gat. 3734' S., long. 17922' 

 E.); 1279 meters; temperature 4.44 C.; blue mud; July 10, 1874 [P. H. Carpenter, 

 1882, 1887, 1888; A. H. Clark, 1913] (1, B.M.). 



Remarks [by A.M.C.]. As explained under the heading of P. japonicus, I do 

 not think this Australasian form is conspecific with the Japanese one, although there 

 are many similarities. 



PENTAMETROCRINUS VARIANS (P. H. Carpenter)* 



[See vol. 1, pt. 1, figs. 119(p. 185), 308(p. 267) ; pt. 2, figs. 286(p. 215), 758(p. 353), 802(p. 378)] 



Eudiocrinus varians P. H. CARPENTER, Journ. Linn. Soc. (Zool.), vol. 16, 1882, p. 495 (in key), p. 496 

 (description; Challenger sta. 205); Proc. Roy. Soc. Edinburgh, vol. 12, 1884, p. 367 (comparison 

 of the cirri with those of Antedon hystrix [Poliomctra prolixa]); Trans. Linn. Soc. (Zool.), ser. 2, 

 vol. 2, 1886, p. 475 (dimorphism of the cirri); Challenger Reports, Zoology, vol. 26, pt. 60, 1888, 

 p. 81 (description; Challenger sta. 205), pi. 7, figs. 3-7). WALTHER, Einleitung in die Geologic 

 als historische Wiss., 1894, p. 299 (from Carpenter). MINCKERT, Arch. Naturg., Jahrg. 71, 1905, 

 vol. 1, Heft 1, p. 189 (syzygies). HAMANN, Bronn's Klassen und Ordnungen des Tier-Reichs, 

 vol. 2, Abt. 3, 1907, p. 1576 (listed). A. H. CLARK, Proc. U.S. Nat. Mus., vol. 32, 1907, p. 569 

 (Albatross stas. 4906, 4911, 4912, 4915, 4916, 4919, 4920, 4975, 5082, 5083), p. 570 (discussion 

 of range), p. 572 (comparison of range with that of P. japonicus), p. 574 (original reference and 

 type locality); vol. 34, 1908, p. 271 (history; structure; relationships; assigned to Pentametro- 

 crinus); vol. 35, 1908, p. 113 (arm structure); Proc. Biol. Soc. Washington, vol. 21, 1908, p. 134 

 (arm structure; removed to Pentametrocrinus) ; Crinoids of the Indian Ocean, 1912, p. 33 ( Penta- 

 metrocrinus varians) . 



* See also Addenda (p. 836) under 1962. 



