﻿198 "ENDEAVOUK" SCIENTIFIC EESULTS. 



Jongitudinal grooves ; and since grooves of very similar ap- 

 pearance (though of quite different morphological character) 

 occur in a number of specimens of the present series, one feels 

 convinced that it is these latter which \Vhitelegge would have 

 selected as typical. These grooves, which are of the same 

 nature as those occurring in the var. cuicliomtus, provide an 

 additional feature by which the present variet}', in its strictest 

 sense, may be identified ; they are well pronounced in the 

 specimen herein figured. Confining our attention to the 

 specimens which agree in this character, the following diag- 

 nosis based on the spicules is obtained : — Principal and aux- 

 iliary spicules approximating in stoutness, the latter subtylote 

 in the manner shown in the text-figure (fig. a), the former 

 without any basal peculiarity. Acanthostyles moderately 

 abundant, seub-clavate (figs, a', b), with comparatively small 

 spines ; those which echinate the fibres are usually very deeply 

 implanted, and increase considerably in abundance towards 

 the outer end of the main fibres. The dimensions of the spi- 

 cules are as follows : — 



Megascleres. — 



(i.) The principal styli attain, in all the specimen, a maxi- 

 mum length of 230 to 240 or (very rarely) 250 /(, but 

 the diameter of the stoutest varies in different speci- 

 mens from 7 to 9 ji. 



(ii.) The greatest length of the acanthostyles lies, in all 

 the specimens, between 70 and 76 n, but their greatest 

 diameter varies in different specimens from 5.5 to 

 8 )i. The stoutest were found in the specimen fixed 

 upon as the type. 



(iii.) The auxiliary subtylost\li, in the specimen selected 

 as the actual type (Z. 936)1 and in some others bear- 

 ing an extremely close external resemblance to it, 

 never exceed a length of 310 jt and very rarely reach 

 beyond 290 ji ; in the remaining specimens much 

 higher values were obtained, viz., 340 to 360 ji. 



The special dermal styli and the microscleres are, so far as 

 one can judge, of practically similar dimensions, not only in all 

 the specimens here in question, but also in those presently to 

 be considered. The first-mentioned are probably with few ex- 

 ceptions less than 150 /! in length. The larger chela? vary 

 from 12 to 17 jt in length, whilst the largest contort chela? 

 appear never to exceed a length of 12 /;. The toxa are no 

 different from those of other varieties. 



1 In order to mark the actual specimens investigated so that, if need 

 he, they may be used for future reference, I quote their Register 

 Numbers. 



