A MONOGRAPH OF THE EXISTING CRINOIDS 415 



In 1915 I discussed the range of this species in my memoir on Antarctic crinoids, 

 and also on a paper on the distribution of the crinoids of Australia. 



In 1916 Dr. Hubert Lyman Clark recorded six lots uicluding 145 specimens 

 from the New Wouth Wales coast. He said that this scries shows no tendency to 

 intergrade with P. macronema and fully justifies my separation of the two forms. 

 He remarked that none of the material in the collection throws any light on the 

 disagi-eement between liim and myself with reference to the j'oung of Ptilometra. 

 "We are each equally sure of being right, and no doubt will continue to feel so until 

 the life history of one of the members of the genus is fully known. It seems to me 

 possible that Bell's Antedon mlsoni, which I have never seen, and my Himerometra 

 paeJophora are the same species, but I am perfectly sure tlie latter is not a PtUometra 

 and has no near relationship to that genus. It is to be hoped that some Australian 

 zoologist will before long investigate carefully the life history of the comatulids, so 

 accessible from Sydney or from Melbourne." 



Dr. Torsten Gisl^n in 1924 cited Himerometra paedophora as the young of Ptilo- 

 metra mUlleri, following me. He described various structural features of this species 

 but did not give the origin of his material. 



A further discussion of Himerometra paedophora and Antedon wHsoni will be found 

 under the genus Aporometra (see Part 5). 



Family ASTEROMETRIDAE Gisl^n 



Basicurva group (in part) P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, 



p. 102 (^Antedon longicirra only); for further references see Part 4c; also Part 4a, p. 180. 

 Thalassometridae (in part) A. H. Clark, Proc. Biol. Soe. Washington, vol. 21, 1908, p. 136; for 



further references see Part 4c. 

 Thalas-sometrinae (in part) A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 2; for further 



references see Part 4c. 

 Thalassomfitres (in part) A. H. Clark, Bull. Mus. Hist. Nat., Paris, No. 4, 1911, p. 255. 

 Ptilometrinae (in part) A. H. Clark, Bull. Inst. Ocfianogr., Monaco, No. 294, 1914, pp. 7, 8 (Aslero- 



metra and Pterometra, but not Ftilotnetrn) ; for further references see p. 393. 

 Thalassometriden (in part) A. II. Clark, Die Crinolden der Antarktis, 1915, p. 192. 

 Asterometridae GislSn, Zool. Bidrag Uppsala, vol. 9, 1924, pp. 118, 231 (new family; diagnosis), 



236, 239; Vid. Medd. Dan.sk Naturh. Foren., vol. 83, 1927, p. 42. — Sieverts, Neues Jahrb. 



Min., Geol. und Pal., vol. 69, Beilage-Band, .\bt. B, 1932, pp. 147, 148, 151.— Gisl£n, Kungl. 



Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, pp. 18, 20,25.— A. H. Clark, Temminckia, 



vol. 1, 1936, p. 312; John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936, p. 103.— 



Gisl6n, Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 1936, p. 19. — H. L. Clark, Echino- 



dcrni fauna of Australia, 1046, p. 23 (in key), p. 56. 



Diagnosis. — A family of tlic suporfamily Tropiometrida in which the ventral peri- 

 some of the pinnules is protected by well developed side- and covering-plates; Pi 

 resembles Po but is shorter and more slender; and the centrodorsal is a short more or 

 less pentagonal column with a conical tip with the radial areas separated from each 

 other by more or less developed ridges and the cirrus sockets arranged in 10 definite 

 columns, two in each radial area. 



Geographical range. — P>om the Kei Islands and the Sahul Bank south of western 

 Timor northwestward to the Gulf of Martaban and northward to the Philippines, the 

 Bonin Islands, and southwestern Japan. 



Bathymetrical range. — From 5 to 256 meters; most numerously represented be- 

 tween 50 and 200 meters. 



