80 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



EUMETRA APHRODITE (A. H. Clark) 



Iridometra (Eumetra) aphrodite A. H. CLARK, Notes Leyden Mus., vol. 34, 1912, p. 137 (description; 

 Siboga Sta. 294). 



Eumetra aphrodite A. H. CLARK, Unstalked crinoids of the Siboga-Exped., 1918, p. 213 (in key; 

 range; references; detailed description; Stas. 49a, 294), pp. 271, 275 (listed), pi. 25, fig. 76. 

 GISLN, Vid. Medd. Nat. Foren. K0benhavn, vol. 83, 1927, p. 3 (Sta. 21), pp. 45, 46 (Sta. 21; 

 notes), p. 69 (listed); figs. 38, 39, p. 44. A. H. CLAHK, Journ. Linn. Soc. (Zool.), vol. 36, No. 249, 

 1929, p. 660 (Macclesfield Bank, 35-41 fathoms). GISLN, Kungl. Fysiogr. Sallsk. Lund Forh., 

 vol. 7, No. 1, 1936, pp. 4, 6 (range). 



*Diagnostic features. The cirri are about a quarter of the arm length, composed 

 of 16 to 18 segments which are not especially long, the longest being nearly or quite 

 three times as long as broad proximally and the last three or four less than twice as long 

 as the distal breadth; there is a prominent opposing spine and the terminal claw is 

 strongly curved. The arms are about 75 mm. and the cirri from 16 to 18 mm. in length. 



Description. Centrodorsal low hemispherical, about 2.9 mm. in diameter at the 

 base, almost completely covered with cirrus sockets; the small dorsal pole is papillose, 

 as in E. chamberlaini. 



Cirri XXXV-L, 16-18, from 16 to 18 mm. long; first segment very short, second 

 about twice as broad as long, third nearly or quite as long as the proximal diameter, 

 fourth from two to two and a half tunes as long as the proximal diameter, fifth to seventh 

 the longest, nearly or quite three times as long as the proximal diameter; following very 

 gradually decreasing in length so that the antepenultimate is from a third to half again 

 as long as broad; the cirri are not especially slender; they become moderately com- 

 pressed laterally in the distal half; the longer earlier segments have a slight central 

 constriction, and the shorter distal have the proximal dorsal angle cut away so that 

 the distal dorsal angle of the preceding appears prominent ; all the segments have promi- 

 nently overlapping distal ends ; the cirri do not taper distally. 



Division series and arm bases resembling those of E. chamberlaini. Arms 10, 

 about 75 mm. long. 



The distal intersyzygial interval is three muscular articulations. 



Pj is 5.5 mm. long, composed of 11 or 12 segments, of which the first is not quite 

 so long as broad, the second is about as long as broad, the third is half again as long as 

 broad, and the remainder are about twice as long as broad ; the pinnule is slightly stiff- 

 ened, and tapers evenly from the base to the tip; P 2 is 7 mm. long, with 15 segments 

 of which the first is twice as broad as long, the second is nearly as long as broad, the 

 third is half again as long as broad, and the remainder are about twice as long as broad; 

 the pinnule is proportionately stouter than P 1; and the outer segments have slightly 

 prominent distal angles and slightly spinous distal edges; P 3 is 10 mm. long, with 19 

 segments, resembling P 2 but tapering slightly less rapidly and with the outer segments 

 relatively longer; P 4 is from 4.5 to 5.5 mm. long, with 10 to 13 segments, smaller than 

 P 2 , though similar to it; P 5 is 6.5 mm. long, with 14 segments; distal pinnules extremely 

 slender, 8 mm. long, with 17 segments. 



Notes.- Gislen has described a specimen from the Sagami Sea area which differs in 

 some small details from the above description. It has the cirri about LV, with 12 to 17 

 segments and 5 to 13 mm. long. The fifth and sixth segments are the longest, being 

 twice as long as broad. 



* Utinomi and Kogo (see Addenda for 1965) figure a cirrus with 20 segments, also PI, P z , and 

 Pa, with 7, 10 or 11, and 24 segments respectively. 



