A MONOGRAPH OF THE EXISTING CRINOIDS 251 



N.Jong. 12r52'30" E.); 72-80 metera; September 5, 1929 [A. H. Clark, 1936] (1, 



Geographical range.—From southwestern Mindanao to the Bonin Islands 

 Bathymetrical range.-From 72 to 80 meters; Dr. Bock's records represent the 

 length of hne out, not the actual depth. 



History. -Tins species was described in 1922 by Prof. Torsten Gisl6n from 17 

 specimens collected by Dr. Sixten Bock, 15 at station 43 and 2 at station 53. In 

 1936 I recorded and gave notes on a specimen that had been dredged by the Dutch 

 steamer Willebrord Snellius off southwestern Mindanao, Philippines. 



Genus EMBRYOMETRA Gislen 



Embryometra Gislen, Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 17. No. 2, 1938. p. 4 (in com- 

 bination as EmbryomHra morlenseni, new genus and species), pp. 5. 12.-Gisl£n Lunds Univ 



S p'. "r '"'■' ^' ^°'" ^*' ^°- ^^' ^'■''°^- ^^"'^''- "^°'*'' "''"■ '''■• ^'°'- ^9. No. 1 7,' 



Dingnosis.—A genus of Colobometridae including small species with 10 arms 

 35-65 mm. long m which the cirri, which are fairly long and not especially slender 

 are composed of 14-19 segments having the distal dorsal edge thickened and obscurely 

 sp nous; P, is markedly longer than P, or P,; P, and usually also other of the proximal 

 pinnules are absent; and the genital pinnules have the third-fifth segments broadened 

 to protect the gonads. 



Geographical range.— Known only from southwest of the Cape of Good Hope 



Bathymetrical range.— From 293 to 325 meters. 



Re7narks.~The genus Embryometra appears to be most closely related to the 

 genus Clarkometra, though differing from it in several important features. The expan- 

 sion of the third-fifth segments of the genital pinnules suggests a relationship to the 

 southeast Australian Austrometra and the Caribbean Analcidometra. 



EMBBYOMETRA MORTENSENI Glsl£ii 



Embryometra morlenseni Gisl£n, Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 17 No 2 1938 

 p. 12. pi. 2. fig. 6, text figs. 12-15, p. 13 (localities; description; notes). ' • ■ - . 



Description.— The centrodorsal is hemispherical, 1.7 mm. in diameter at the base 

 with a flattened dorsal pole about 0.7 mm. in diameter. The cirri are arranged in a 

 partially double row. 



The cirri are XVI, 16-18, about 6 mm. long, strongly recurved. The first seg- 

 ment is short, the second is from one-tliird again to twice as broad as long, the third 

 IS up to one-third again as long as broad, the fourth is one-third again as long as 

 broad with the distal portion somewhat flaring, and those foUowing are similar or a 

 httle shorter, the distal flaring gradually becoming more and more obsolete. The 

 antepenultimate segment is one-quarter again as long as broad. The opposing .spine 

 IS subterminal and erect. The terminal claw is curved, and is insignificantly^longer 

 than the penultimate segment. There are no dorsal spines. Professor Gislen said 

 that when the cirri are viewed from the side there is a suggestion of an indistinct 

 carination, but when viewed dorsally no such carination can be detected, though 

 there seems to be a distal thickening with a very fine and obsolete spinosity— just as 

 on the ends of comatulid bracliials under high magnification. 



