16 



^ TERRA NOVA" EXPEDITION. 



jReinarkv. — The ouly .specimeus of this species remaining in the "Challenger" 

 collection are five from Station 313 (East coast of Patagonia). The largest of these, 

 a male, is that of which measurements are given l)y Hoek and supplemented above, 

 and it may be selected as the holotype. 



The specimen obtained by the "Terra Nova" is in close agreement with the 

 holotype, and, like it, differs from specimeus of (.'. frigida not only in the greater 

 relative length of the claws, but also in the form of the proboscis, the distal part 

 of which is nearly cylindrical, with hardly a trace of a sub-terminal constriction. 



It is to be noted, however, that the specimens accompanying the holotype in the 

 " Challenger " collection are by no means exactly like it or like one another. The 

 three smallest specimens (regarded by Hoek as immature, but having distinct genital 

 openings) have the proboscis, at most, only a little longer than the trunk and distinctly 

 contracted beyond the proximal dilatation. One specimen, in which the proboscis is 

 only equal in length to the trunk, and the legs distinctly shorter and stouter than in 

 any of the others, is further remarkable in having the tarsus actually shorter than the 

 propodus. Another specimen has the seventh palpal segment no longer than wide. 



These differences, if the specimens are correctly referred to a single species, imply 

 a range of variability that must throw doubt on the validity of other closely -related 

 species in the genus. 



It is much to Ije regretted that the specimen from Kerguelen, referred by Hoek 

 to this species, is no longer in the " Challenger" collection. 



Colossendeis rugosa, Hodgson. 

 C. rugosa, Hodgson, 1907, p. 64, PI. ix, fig. 4, PI. x, fig. 7. 

 Occurrence^. —Station 294, Ross Sea, 158 fathoms ; 1 $. 

 Measurements, in mm. — 



Length of joroboscis 



Greatest diameter of proboscis 



Length of trunk 



Width between first and second lateral processe 



Width across second lateral processes 



Length of abdomen 



Third right leg — 



Coxee 



Femur 



First tibia . 



Second tibia 



Tarsus 



Propodus 



Claw . 



