A MONOGRAPH OF THE EXISTING CRINOIDS 375 



Bathymetrical range, From 20 to 600 meters; the average of 31 records is 114 

 meters. 



Thermal range. From 13.28 C. to 15.89 C.; the average of 3 records is 15.00 C. 



Remarks. This is a rather common species in suitable localities on the coast of 

 southern Japan where it has been collected by the Albatross, by Alan Owston in his 

 yacht Golden Hind, by Prof. Franz Doflein, by Dr. Haberer, by Dr. Th. Mortensen, 

 and by Dr. Sixten Bock, as well as by several Japanese naturalists. 



For an account of the association between this and the 2 other Japanese species 

 of this family, Pectinometra flavopurpurea and Calomelra callista, see page 383. 



Genus PECTINOMETRA A. H. Clark 



Antedon (part) A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 134, and following authors. 



Calomelra (part) A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 363. 



Pedinometra A. H. CLARK, Amer. Journ. Sci., ser. 4, vol. 32, 191 1, p. 129 (women nudum; characteristic 

 of the Japanese fauna; significance); Crinoids of the Indian Ocean, 1912, p. 17 (significance 

 of the conditions in this genus in southern Japan), p. 23 (range), p. 58 (in key), p. 185 (diagnosis; 

 a genus of Calometridae; genotype Antedon flavopurpurea A. H. Clark, 1907); Die Crinoiden 

 der Antarktis, 1915, p. 125 (certain species show the characteristic features of Anthometra 

 adriani); Unstalked crinoids of the St&oja-Exped., 1918, p. 138 (key to the included species). 

 GISLN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 96, 97; Kungl. 

 Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 20. 



Pectiometra GISLN, Zool. Bidrag Uppsala, vol. 9, 1924, p. 54. 



Diagnosis. A genus of Calometridae hi which the arms are 15-20 in number, 

 all the division series being 2; the radials are not extended upward interradially; 

 the division series are m apposition with those on either side directly or through 

 more or less irregularly developed lateral extensions; the proximal portion of the 

 animal is compact, the sides hi profile making a relatively small angle with the 

 dorsoventral axis; the longer oral pinnules are markedly longer than the shorter 

 genital pinnules; and the segments of the genital pinnules are more or less expanded. 



Geographical range. From the Andaman Islands to Celebes and the Philippines, 

 and northward to southern Japan as far east as Tokyo Bay. 



Bathymetrical range. From 155 (?115) to 450 meters. 



Thermal range. From 8.67 C. to 17.22 C. 



History. The name Pectinometra first appeared as a nomen nudum in a list of 

 comatulid genera characteristic of the waters of southern Japan published hi 1911. 

 In 1912 the genus Pectinometra was formally diagnosed, and Antedon flavopurpurea 

 A. H. Clark, 1907, was given as the genotype. There has been no change in the 

 status of the genus since that tune. 



KEY TO THE SPECIES IN THE GENUS PECTINOMETRA 



a 1 . Ossicles of the division series and first 2 brachials with no trace of median carination, rugose on 



the dorsal surface and with finely crenulate edges which are not everted; 15-20 arms; cirri 



with 26-40 (usually 34-36) segments (Philippine Islands; 177-201 meters). carduum (p. 376.) 



a*. Ossicles of the IBr series with a prominent high median keel; a similar but much less developed 



(sometimes obsolete) keel on the ossicles of the IIBr series and the first 2 brachials; the edges 



of the ossicles of the division series may be everted, but are never crenulate; usually 20 arms. 



b 1 . Cirri with 41-48 segments; keel on the osbicles of the IBr series very high and prominent, 



especially proximally; edges of the ossicles of the division series only slightly or not at all 



everted (Celebes to trie Andaman Islands; 302-450 meters) magnifies (p. 377.) 



