68 
“TERRA NOVA” EXPEDITION. 
i 
In the male sex, the second coxa of the penultimate leg has the posterior corner, which 
hears the openings of the cement-glands, slightly produced as a round knob, in striking 
contrast to the long process found in this position in R. mediterraneus. 
9C 
Genus PYCNOGONUM, Briinnich. 
Pi/cnogonum gaini, Bouvier (Text-fig. 22). 
P. gaini, Bouvier, 1910, p. 30; id., 1913, p. 156, text-figs. 101-101. 
Occurrence .—Station 220, off Cape A dare. 45-50 fathoms; 1 young. Station 314, 
McMurdo Sound, 222-241 fathoms; 2 $. Station 338, Entrance to McMurdo Sound, 
207 fathoms; 3 $, 1 ?. Station 340, off Granite Harbour, 160 fathoms; 1 $. Station 
355, McMurdo Sound, 300 fathoms ; 1 f. 
Remark *.—This species, described by Bouvier from a single female specimen, is 
also represented in the “ Gauss ” collection. The “Terra Nova ” specimens from the 
Boss Sea area complete the record of circumpolar distribution 
for the species. They agree closely with Bouvier’s account, and 
the largest is of nearly the same size as that described bv him. 
It is not quite correct, however, to state that the species is “ de 
beaucoup, la plus grande du genre Pi/cnogonum." Sars’s and 
Norman’s measurements and the evidence of specimens in this 
Museum show that P. littorale grows to a similar or even slightly 
greater size. 
The ovigers of the male (Fig. 22) are composed of eight 
segments, excluding the terminal claw, in contrast to those of P. 
littorale , which have nine.* The penultimate segment is very short, giving the 
terminal part of the oviger some resemblance to that of the walking legs, with which 
dages the oviger also agrees in the total number of its segments. 
gaini, Bouvier. Oviger 
of Male. 
* Curiously enough Sars (1891, pp. 8 and 10, PI. 1, fig. Ip) attributes only eight segments to the 
ovigers of P. littorale, and notes that they “ have the same number of joints as the ambulatory legs.” 
The ovigers of this species have been correctly described and figured by Hoek (1877, p. 237, PI. xiv, fig. 1), 
and Wilson (1880 p. 469, PI. 1. fig. 3a). 
