A MONOGR.\PH OF THE EXISTING CRINOIDS 527 



Dr. Sixten Bock's expedition to Japan station 51 ; Bonin Islands, in the channel; 

 73 meters; August 3, 1914 [Gislcn, 1922]. 



Dr. Sixten Bock's expedition to Japan station 59; Bonin Islands, eastnortheast 

 of Anojima; 183 meters; August 15, 1914 [Gisl6n, 1922]. 



Dr. Sixten Bock's expedition to Japan station 60; Bonin Islands, castsoutheast 

 of the channel; 152 meters; August 16, 1914 [Gislcn, 1922]. 



Geographical range. — The Lesser Sunda, Phillipine and Bonin Islands. 



Bathymeirical range. — From 54 (?27) to 89 meters. It probably extends into 

 deeper water. The depths given for Bock's stations represent not the actual depth, 

 but the amount of line out. 



Parasite. — Gislcn found in the pinnules and arms of specimens from the Bonin 

 Islands a new cntoparasitic myzostomid which he compared to Proiomyzostomum. 



History. — This species was originally described in 1909 from 2 specimens collected 

 by the Albatross in the Philippines. In 1918 another specimen was recorded which 

 had been collected by the Siboga at Timor. 



In 1922 Dr. Torsten Gislcn recorded 6 specimens which had been collected by 

 Dr. Sixten Bock in the Bonin Islands in 1914. Gislcn suggested the varietal name 

 grandis for the specimens from the Bonin Islands, as they are larger than the type 

 with more numerous cirri and cirrus segments and an abundance of IVBr series. 

 It is doubtful whether such a difference between individuals from the Bonin Islands 

 and the Philippines actually exists, for it is among the Philippines and adjacent 

 islands that the comasterids locally reach their largest size and greatest development, 

 and it is scarcely to be supposed that this species would furnish an exception. 



Genus COMANTHUS A. H. Clark 

 Comatula (part) Lamarck, Hist. nat. des animaux sans vert^bres, vol. 2, 1816, p. 533. 

 Comaster (part) L. Ag.\ssiz, MC'in. soc. de sci. nat. Neuchfitel, vol. 1, 1835, 1836, p. 193 (genotype 



Comatula multiradiala Lamarck which includes a specimen of Comanthua hennelli; by sub- 

 sequent authors largely used with the genotype Comatula muliiradiata Goldfuss, 1832 = Comaw- 



thus benneUi; used by A. H. Clark, 1908, with the genotype Asterias muUiradiata hian6 1758, 



but this corrected in 1909). 

 Alccio (part) J. MtJLLER, Monatsber. d. k. preuss. Akad. d. Wiss., 1841, p. 187. 

 Comatula {Aclinomclra) (part) J. Muller, Abhandl. d. k. preuss. Akad. d. Wiss., 1847, 1849, p. 256. 

 Comatula (Aledo) (part) J. MtJLLEn, Abhandl. d. k. preuss. Akad. d. Wiss., 1847, 1849, p. 261. 

 Actinometra (part) Dujardin and Hupfi, Hist nat. des zoophytes, Echinodfermes, 1862, p. 210, and 



following authors. 

 Actinometra {Comatula) (part) P. H. Carpenter Journ. Anat. and Physiol., vol 10, 1876, pp. 574, 582. 

 Aetinometra P. H. Carpenter, Notes from the Leyden Mus., vol. 3, 1881, p. 204. 

 A7itedon (part) Bell, Proc. Zool. Soc. London, 1882, p. 533; Ann. and Mag. Nat. Hist., ser. 5, 



vol. 10, 1882, p. 225; Marine Invest, in South Mrica, vol. 4, part 4, 1905, p. 139. 

 Goldfussia Norman, Ann. and Mag. Nat. Hist., ser. 6, vol. 7, No. 40, April, 1891, p. 387 (genotype 



Comatula vmltiradiata Goldfuss). — B.a.ther, Ann. and Mag. Nat. Hist., ser. 6, vol. 7, 1891, p. 



464 (preoccupied). — Norman, Ann. and Mag. Nat. Hist., ser. 6, vol. 8, No. 44, August, 1891, 



p. 180. — A. H. Clark, Crinoids of the Indian Ocean, 1912, p. 89 (history). 

 Actrinomelra (part) Hartlatjb, Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 97. 

 Phanngenia (part) A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, 1908, p. 124. 

 Comanthus A. H. Clark, Proc. Biol, Soc. Waiihington, vol. 21, 1908, p. 220 (used as a generic name 



for 2 new species, C. intricata and C. dccamcros) ; Smiths. Miscell. Coll., vol. 52, pt. 2, 1908, 



p. 203 (diagnosis; genotype Aledo parvicirra J. Muller, 1841); Zool. Anzeiger, vol. 34, No. 



11-12, 160?, p. 2':Z (trr^'cal g?ni:s cecu.'ring in southwestern Australia); Proc. U. S. Nat. 



