PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 749 



with a species of Fariometra in the south and with a species of Retiometra in the north. 



History. It, is quite possible that the small form of Anledon from Vladivostock 

 mentioned by Prof, von Graff in 1S84 as the host of an undetermined myzostome was 

 this species, as this is the only comatulid known from that region except for the very 

 much larger Ileliometra glacialis maxima. 



In a preliminary account (1907) of the comatulids secured by the Albatross during 

 the cruise of 1906, I described as new Antedon tennis and Antedon ciliata. Subse- 

 quently coming across the name Antedon tennis in one of Carpenter's papers, I proposed 

 the alternative name Antedon stella for my tennis later in the same year. But Car- 

 penter's Antedon tennis is a nomen nudum and is therefore without effect so far as ray 

 tennis is concerned (A. H. Clark, 1908). 



In 1908, on proposing the new genus Thaumatometra with Antedon ciliata as the 

 type, I included in that species Antedon tennis which seemed, on further study, to be 

 based on immature individuals of ciliata. The name tennis was selected for the species, 

 however, because of page priority. In another paper published in the same year 

 I figured the centrodorsal and the base of one of the post-radial series. 



In 1909 I recorded Tliaumatometra tennis from 3 additional localities on the Korean 

 coast where it had been obtained by Suensson and Schonau, and in 1913 I added 

 another locality where it had been found by Suensson. 



In a memoir on the crinoids of the Okhotsk and Japan Seas published in 1937, 

 I gave the complete synonymy of this species and a number of new localities, together 

 with a complete list of the previous records and the geographical, bathymetrical, and 

 thermal ranges; also a general account of its associations. 



THAUMATOMETRA ABYSSORUM (P. H. Carpenter) 



Antedon abyssorum P. H. CARPENTER, Quart. Journ. Micr. Sci., new ser., vol. 27, 1887, p. 386 (nomen 

 nudum; sacculi largely developed); Challenger Reports, Zoology, vol. 26, pt. 60, 1888, p. 190 

 (description; sta. 147), pi. 29, figs. 10-13. HARTLAUB, Nova Acta Acad. German., vol. 58, 

 No. 1, 1891, p. 14 (deep sea; 1,600 fms.). SHIPLEY, Antarctic manual, 1901, ch. 18, p. 269. 

 DODERLEIN, Fauna Arctica, vol. 4, Lief. 2, 1905, p. 405 (antarctic representative of the Tenella 

 group). A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 353 (listed). HAMANN, 

 Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1579 (listed). A. H. 

 CLARK, Crinoids of the Indian Ocean, 1912, p. 33 (of P. H. Carpenter, 1888= Thaumalomeira 

 abyssorum}. 



Thaumalomeira abyssorum A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 128 (listed); 

 Crinoids of the Indian Ocean, 1912, p. 33 ( Antedon abyssorum P. H. Carpenter, 18881, p. 246 

 (synonymy; locality) ; Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 65 (published references 

 to specimens in the B.M.; Challenger sta. 147; comparison with T. lenuis); Journ. Washington 

 Acad. Sci., vol. 5, 1915, No. 3, p. 81 (antarctic; range); Die Crinoiden der Antarktis, 1915, p. 106 

 (collected by the Challenger; recorded as Anledon abyssorum), p. 107 (in key to antarctic crinoids), 

 p. 147 (synonymy; locality), p. 170 (deep water antarctic species; occurs in the region south of the 

 Indian Ocean), p. 171 (systematic and geographical relationships); Unstalked crinoids of the 

 Siboja-Exped., 1918, p. 255 (in key; range), p. 256 (references). GISLE.V, Ark. ZooL, vol. 19, 

 No. 32, 1928, p. 11 (centrodorsal). 



Diagnostic features. There are 15 to 18 cirrus segments which are subequal, 

 much elongated, the antepenultimate being about three times as long as its proximal 

 width and the penultimate twice as long as wide; P] and P 2 have about 10 segments; 

 P 2 bears a gonad. When the arms are about 35 mm. long the longest cirri are at least 

 12 mm. 



