A MONOGRAPH OF THE EXISTING CRINOIDS 57 



In 1924 Dr. Torsen Gisl6n described the syzygies and pinnule articulations of this 

 species. 



In 1938 Dr. H. L. Clark recorded and gave brief notes on three specimens that 

 had been brought up from 70 fathoms off Gabo Island by Capt. K. Moller and pre- 

 sented to the Australian Museum. 



GISLENOMETRA, new genus 



Pachylometra (part) H. L. CLARK, Ann. South African Mus., vol. 13, pt. 7, 1923, p. 234. GISLN, 

 Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 17, No. 2, 1938, p. 18. 



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

 about 25 mm. long in which the third and fourth segments of the genital pinnules are 

 much broadened and the fifth less broadened to protect the gonads; PI is stout, stiff, 

 and styliform with 6-9 segments, shorter than the less stiffened and curved P 2 ; and 

 the cirri, which except for some of the peripheral are short and stout, have 15-21 

 segments which are without dorsal processes except for the opposing spine. 



This genus is closely related to Austrometra from southeastern Australia from 

 which it differs in the absence of dorsal processes on the cirri, and in having PI, though 

 straight, stout, and styliform, shorter than the recurved P;. 



Genotype. Gislenometra perplexa, new species. 



Geographical range. Coast of southeastern Africa from East London, Cape 

 Colony, to Durban, Natal. 



Bathymetrical range. From 238 (?146) to 567 meters. 



History. Specimens of the only species in this genus were recorded as the young 

 of Pachylometra sclateri by Dr. Hubert Lyman Clark in 1923, and additional speci- 

 mens were recorded under the same name by Prof. Torsten Gisl6n in 1938 who, how- 

 ever, doubted the correctness of the identification. 



GISLfiNOMETKA PERPLEXA. new species 



Pachylometra sclateri (part) H. L. CLARK, Ann. South African Mus., vol. 13, pt. 7, 1923, p. 234 

 (Pieter Faure Nos. 12884, 13227), notes. GISLN, Kungl. Svenska Vet.-Akad. Handl., ser. 

 3, vol. 17, No. 2, 1938, p. 18, text figs. 16, 17, p. 19, pi. 2, fig. 7. 



Description. The centrodorsal is high hemispherical with the dorsal pole broadly 

 and evenly rounded. The cirrus sockets are arranged in a partially double irregular 

 marginal row; where the row is double the lower socket is directly under the upper. 



The cirri are XV, the longest with 17 segments and 5 mm. long. They are stout 

 and strongly curved. The first segment is very short, the second is about twice as 

 broad as long, the third is somewhat longer, and the fifth and following are slightly 

 longer than broad, with the dorsal and ventral profiles nearly parallel. The distal 

 segments, which in the stout cirri are about as long as broad, have the distal border 

 finely serrate, though not everted or produced. The opposing spine, which arises 

 from the entire dorsal surface of the penultimate segment, and not from the distal 

 end as in the Charitoinetridae, is very broad, the two sides making nearly a right 

 angle with each other. The terminal claw is about as long as the penultimate seg- 

 ment and is stout and evenly curved. 



There are no basal rays. 



724008 17- 5 



