PYCNOGONIDA— CALMAN. 43 



Occurrence. — Station 294, Eoss Sea, 158 fathoms ; 2 ?, 1 ^. 



Remarks. — The specimens agree very closely indeed with those of the " Discovery " 

 collection, referred to this species by Hodgson. While accepting this identification, I 

 would point out that the specimens from the Ross Sea region agree with one another 

 in certain characters, in which they differ from the two surviving syntypes of Hoek's 

 species.* In the latter the body and limbs are distinctly more slender, the lateral 

 processes separated by nearly their own diameter, the abdomen nearly equal to the 

 first two segments together, the auxiliary claws less than one-fourth as long as the 

 main claws, and the "under-fur" of minute setse is everywhere conspicuous on the 

 surface of the body and legs. The Ross Sea specimens are more robust, the lateral 

 processes separated by not more than half their own diameter, the abdomen is about 

 equal to (only in one specimen distinctly longer than) the cephalic segment, the 

 auxiliary claws are about one-third as long as the main claws, the under-fur is much 

 less conspicuous and less generally distributed. 



Palleno2:>sis vanhoffeni, Hodgson. 



Pallenopsis vanlioffeni, Hodgson, 1914-15, p. 145. 



P. gaussiana, id., ibid. 



P. setigera, id., t.c. p. 146. 



Occurrence. — Station 220, off Cape Adare, 45-50 fathoms ; 1 young. 



Remarks. — The single, very young specimen resembles fairly closely in size and 

 structure the holotype of P. gaussiana, with which I have compared it. It seems very 

 probable, however, that P. gaussiana is the young form of P. vanhoffeni, Hodgson ; 

 and, indeed, I find that Mr. Hodgson mentions this as a possibility in the description 

 of the species that he has kindly permitted me to see in manuscript. The spines near 

 the antero-lateral margins of the cephalon, which Hodgson notes as distinctive of 

 P. gaussiana, are found also, although reduced in size, in the adult P. vanhoffeni. 

 The species appears to be distinguished at all stages from P. pilosa by the fact that 

 the trunk-segments are all coalesced. 



I venture also to place P. setigera as a synonym of the same species. Mr. Hodgson 

 relies for its discrimination largely upon the structm'e of the ovigers, which are stated 

 to be club-shaped and composed of seven segments. The only adult specimen among 

 the syntypes that I have examined is a male in which the oviger of the left side is 

 broken off in the middle of the fifth segment. The right oviger has the sixth segment 

 not perceptibly inflated or club-shaped ; on its distal surface is a brown annular scar, 

 from the centre of which rises a shrivelled soft papilla. There can be little doubt that 

 the abbreviated condition of this oviger is the result of accident. In other respects the 

 specimen appears to me indistinguishable from P. vanhoffeni. 



* From " Challenger " Station 157, depth 1,950 fathoms. The specimen recorded from Station 147 

 is not now in the collection. 



G 2 



