PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 487 



liolotype. They do not have so many tubercles. Six arms are complplc to or beyond 

 the second syzygy, which is 9 + 10; some are broken at the third syzygy, which is 

 12 + 13 and one at the fourth, which is 15 + 16. Pi is of 10 segments, 3 mm. long. 

 It tapers more rapidly than in the holotype. The distal edges of the outer segments 

 are produced into very strong spines. 1^2 is sin)ilar but smaller, with 8 segments and 

 less than 2 mm. long. P3 is a genital pinnule longer than Po, with 9 or 10 segments 

 and over 2 nmi. long. 



The remaining specimen is similar in size to the last. The XIX cirri also are 

 arranged in two alternating rows. One arm is complete to the twenty-fom-th brachial 

 and shows that the syzygial pairs bej^ond the third are separated by one brachial. The 

 only two genital pinnules which remain in good condition have their third and fourth 

 segments expanded from side to side and raised into a keel in the midline. The sex of 

 these last two specimens was not determined. 



Localities.—B.A.N .T^.A.U.E. station 113; off Tasmania (lat. 42°40' S., long. 148° 

 27'30" E.); dredge, 174-155 meters; otter trawl, 122 meters; March 23, 1931 [John, 

 1939] (2 including holotype, B.M.; 2, Austral. M.). Type locality. 



B.A.N.Z.A.R.E. station 115; Bass Strait Gat. 41° 03' S., long. 148°42' E.); 128 

 meters; March 24, 1931 [John, 1939] (1, B.M.) 



Geographical range. — Known only from the Bass Strait between Australia and 

 Tasmania. 



Bathymetrical range. — From 122 to 174 meters. 



Genus HYPALOMETRA A. H. Clark 



Antedon (part) P. H. Carpenter, Bull. Mus. Comp. Zool., vol. 9, No. 4, 1881, pp. 155, 164, and 

 following authors. 



Hypalometra A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 133 (diagnosis; type species 

 Antedon defecla P. H. Carpenter, 1888), p. 136 (referred to Antedonidae) ; Proc. U.S. Nat. Mus., 

 vol. 34, 1908, p. 211 (referred to Antedonidae, restricted), p. 212 (occurs in the West Indies); 

 Amer. Nat., vol. 42, No. 503, 1908, p. 725 (color); vol. 43, 1909, p. 580 (pinnulation) ; Proc. 

 Biol. Soc. Washington, vol. 22, 1909, p. 176 (referred to Perometriuae) ; Proc. U.S. Nat. Mus., 

 vol. 36, 1909, p. 362 (deficient pinnulation, like Comatilia); vol. 40, 1911, p. 10 (represented in 

 East Indies by Erylhrometra) ; Amer. Journ. Sci., ser. 4, vol. 32 (whole number 182), 1911, p. 129 

 (characteristic of West Indian fauna; signilioance) ; Crinoids of the Indian Ocean, 1912, p. 14 

 (corresponds to the East Indian Perometra) ; Internat. Rev. gesamt. Hydrobiol. und liydrogr., 

 vol. 6, 1914, pp. 5 and following (represents Perometra in the Atlantic; range); Die Crinolden 

 der Antarktis, 1915, p. 181 (range; represented in the Indo-Pacific by Perometra) ; Journ. Wash- 

 ington .\cad. Sci., vol. 7, 1917, No. 5, p. 127 (referred to Perometrinae) ; No. 16, p. 507 (in key; 

 range) ; Unstalked crinoids, of the Siboga-Exped., 1918, p. 233 (in key; range), p. 236; Univ. Iowa 

 Studies in Nat. Hist., vol. 9, No. 5, 1921, p. 12 (confined to West Indies), p. 16 (in key). — 

 GisLfi-N, Nova .Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 7, 142 (compared 

 with Hypalometra). — .\. H. Clark, The Danish I ngoIf-F.xpcd., vol. 4, No. 5, Crinoidea, 1923, 

 p. 41 (range). — Gisl^n, Zool. Bidrag Uppsala, vol. 9, 1924, pp. 54, 212; Kungl. Fysiogr. Siillsk. 

 Handl., new ser., vol. 45, No. 11, 1934, p. IS. — X. H. Clahk, Mem. Soc. Cubana Hist. Nat., 

 vol. 14, No. 2, 1940, p. 139. 



Diagnosis.- — A genus of Perometrinae in which Pj and P^ are absent. The size is 

 small, the arms not exceeding 35 mm. m length. The cirri have 22-25 segments. 

 Geographical range. — Straits of Florida. 

 Bathymetrical range. — From CO to 386 meters. 

 Thermal range.— From 16.67° C. to 23.33° C. 



