A MONOGRAPH OP THE EXISTING CRINOIDS 251 



N., long. 12152'30" E.); 72-80 meters; September 5, 1929 [A. H. Clark, 1936] (1, 

 L.M.). 



Geographical range. From southwestern Mindanao to the Bonin Islands. 



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

 length of line out, not the actual depth. 



History. This species was described hi 1922 by Prof. Torsten Gisle'n from 17 

 specimens collected by Dr. SLxten 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 GISL^N, Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 17, No. 2, 1938, p. 4 (in com- 

 bination as Embryometra mortenseni, new genus and species), pp. 5, 12. GISLJJN, Lunds Univ. 

 . Arsskr., new ser., Avd. 2, vol. 34, No. 17; Fysiogr. Sallsk. Handl., new ser., vol. 49, No. 17, 

 1939, p. 12. 



Diagnosis. A genus of Colobometridae including small species with 10 arms 

 35-65 mm. long in 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 2 is markedly longer than P! or P 3 ; P a 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. 



Remarks. 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 Austromeira and the Caribbean Analcidometra. 



EMBRYOMETRA MORTENSENI Gislgn 



Embryometra mortenseni GisiJsN, 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-third 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 following are similar or a 

 little 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 dorsaUy 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 brachials under high magnification. 



