A MONOGRAPH OF THE EXISTING CRINOIDS 569 



Mariametra subcarinata A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 145 (arms com- 

 pared with those of M. margaritifera) ; Proc. U. S. Nat. Mus., vol. 36, 1909, p. 647 (ornamenta- 

 tion of sides of division series compared with that in Crinomctra insculpta) ; Vid. Mecld. Naturh. 

 Foren. K0benhavn, 1909, p. 171 (near the Goto Islands, 40 fathoms; off the Goto Island, 22 

 fathoms), p. 172 (off the Goto Island, 40 fathoms; Formosa Channel, 35 fathoms; also specimens 

 with no locality; descriptions of the specimens; 4-rayed specimen from Formosa Channel); 

 Crinoids of the Indian Ocean, 1912, p. 143 (synonymy; range); Proc. Biol. Soc. Washington, 

 vol. 26, 1913, p. 144 (listed), p. 179 (range in east Asia); Journ. Washington Acad. Sci., vol. 5, 

 1915, p. 214 (southern Japanese species; range and its significance); Unstalked crinoids of the 

 Siboga Exped., 1918, p. 108 (in key; range).— Gisl^n, Zool. Bidrag Uppsala, vol. 9, 1924, pp. 74, 

 78 (syzygies), fig. 72, p. 75 (syzygial face); Vid. Medd. Dansk Naturh. Foren., vol. 83, 1927, 

 p. 2 (Mortensen's stations 12, 14; 47 m.), p. 22 (stations 12, 14; notes), p. 68 (listed), figs. 11-14, 

 p. 27; Kungl. Fysiogr. Sallsk. Handl, new ser., vol. 45, No. 11, 1934, p. 25. 



Diagnostic features. — The arms are about 40 in number, 60-80 mm. long; there is 

 no median dark stripe on the division series or arms; the lateral ornamentation on the 

 division series is fine and more or less obscure and difficult of detection; P 3 and P 4 are 

 similar and of the same length, 10-15 mm. long, with 16-20 segments, stouter and 

 stiff er than the other proximal pinmdes, from which they stand out prominently; the 

 cirri are XXX-L, 30-40 (usually 30-35), 15-22 mm. long. 



Description. — The centrodorsal is hemispherical, with a comparatively small 

 strongly convex bare polar area. 



The cirri are XXX-L, 30-10 (usually 33-35), 15-22 mm. long. The first seg- 

 ment is very short, and those following become progressively longer to the sixth or 

 seventh, which is about as long as broad or slightly longer than broad, then remaining 

 fairly uniform to the end of the cirri or becoming very slightly shorter distally. Some 

 of the cirri have the three or four segments following the fifth slightly longer than 

 broad, but the length does not reach one and one-half times the width. From the 

 eighth or tenth onward the segments bear prominent dorsal spines, which at first 

 are borne on their distal ends but later gradually move to a more central position. 

 The opposing spine scarcely reaches half the width of the penultimate segment in 

 height. The terminal claw is moderately stout and well curved, and is about equal 

 to the penultimate segment in length. 



The radials are entirely concealed, or their anterolateral angles are visible in the 

 angles of the calyx. The lB^ are short, about three times as broad as long, and are 

 in close lateral apposition. The IBr 2 (axillaries) are broadly pentagonal, almost tri- 

 angular, about twice as long as the IBr^ The IIBr and IlIBr series are 2, similar 

 to the IBr series but with their component elements proportionately rather longer. 

 The ossicles immediately following each axillary are almost completely united inte- 

 riorly. The division series and the first two to six or seven brachials have a very 

 delicate raised median line which gives them a very characteristic appearance. The 

 lateral portions of the dorsal surface of the division series are occupied by a rather 

 broad band of fine and closely set granulations that narrows distally and disappears 

 on the last axillary or first brachial. This ornamentation is veiy evident on dried 

 specimens, but it may entirely escape detection if the specimen be wet. It was 

 entirely overlooked at the time the species was originally described. The postradial 

 series and one or two of the earliest brachials are in close apposition and are sharply 

 flattened laterally. 



208244—41 37 



