24 



■TERRA NOVA" EXPEDITION. 



Colossendeis rohusta, Hoek. 



C. rohusta, Hoek, 1881, p. 66, PI. ix, figs. 4 and 5 ; Mobius, 1902, p. 190, PI. xxix, figs. 1-5 

 Bouvier, 1913, p. 54, text-figs. 8-11. 



Occurrence. — Station 294, Ross Sea, 15J 

 Measurements, in mm. — 



fathoms ; 1 ^, 1 immature. 



" Terra Nova." " Challenger." 



Length of proboscis ..... 



Greatest diameter of proboscis .... 



Length of trunk ...... 



Width between second and third lateral processes 



Width across second lateral processes 



Length of abdomen ..... 



Third right leg - 

 Coxse 

 Femur 

 First tibia . 

 Second tiliia 

 Tarsus 

 Propodus . 

 Claw . 



Remarks. — Of the two specimens referred to this species, the one is a male 

 and the other an immature specimen in which the genital openings are not yet 

 patent. The former differs from the holotype in having (l) the second coxse of all 

 the legs a little more expanded distally and with more prominent dorsal tubercles, 

 and (2) the claw much more than half the length of the propodus. In both of these 

 characters our specimen agrees better with Bouvier 's figures and description than 

 with the holotype. On the other hand, the outline of the proboscis agrees very 

 well with that of the holotype (not very accurately represented by Hoek's figure) and 

 differs from Bouvier's figures in that the proximal dilatation is well beyond the 

 middle of the length. The femur is exactly equal to the second tibia instead of 

 being slightly shorter (holotype) or longer (Bouvier). It is to be noted that the 

 measurements given by Bouvier as those of the holotype are taken from Hoek's figure, 

 which, however, is enlarged two diameters ; those given above are taken from the 

 specimen itself. 



A conspicuous, or at any rate very tangible, and perhaps important difference 

 from the holotype consists in the presence of minute scattered spines on the proboscis 

 (where they are set, not very regularly, in longitudinal rows) and on the dorsal surface 

 of the legs ; the surface of the body is smooth. 



The immature specimen has the proboscis relatively more slender than in the 

 adult. 



