42 
“TERRA NOVA'’ EXPEDITION. 
none are quite so spiny as Hodgson’s P. glabra. They also differ among themselves in 
the development of the rounded or irregular dorsal prominences on the lateral processes, 
in the sharpness of the distal corners of the first, coxa, and in the extent and shape of 
the “ spinous cushion ’ at the base of the movable finger of the chelophores. In some, 
this cushion is depressed and restricted to a small area at the very base of the finger, 
in others it occupies at least half of the length of the finger, and its distal end projects 
freely as a conical lobe as in W ilson’s figure of the chela of P. forjicifer. In all the 
females the femur is distinctly shorter than the second tibia, although the difference is 
less than in the males. Mobius and Bouvier agree that the femur is equal to the second 
tibia of the female in P. glabra. 
At the distal ends of' the femur and first tibia there are three small tubercles 
dorsally and an indistinct tubercle on each side below the lateral line. These tubercles 
vary in their degree of development, and can hardly be detected in the specimens 
referred by Hodgson to P. glabra ; they correspond to the five processes that are found 
in this position in some or all of the species belonging to Loman’s subgenus Rigona. 
I am not at all confident that this species can be maintained as distinct from 
Phoxichilidium patagonicum, Hoek(1881, p. 84, PI. xii, figs. 6-9). The only adult 
specimen among Hoek’s syntypes is the female which he has figured. This differs 
considerably from all the specimens that I have referred to P. glabra. It has the 
lateral processes separated by less than half their own diameter at the base, the 
eephalou nearly parallel-sided as seen from above, with the ocular tubercle not 
occupying the whole of its width anteriorly ; the chela is hardly widened distally, and 
its outer edge is straight; the propodus is about three times as long as wide, the main 
claw is less than half the length of the propodus, and the auxiliaries about half the 
length of the main claw. In adult specimens of P. glabra the lateral processes are 
separated at the base by a distance about equal to their own diameter, the cephalon 
narrows toward the front, where the base of the ocular tubercle occupies the whole of 
its width ; the chela is widened distally, and its outer edge is concave; the propodus 
is about four times as long as wide, the main claw is usually more than half the length 
of the propodus, and the auxiliaries distinctly less than half the length of the main 
claw. When, however, the comparison is extended to the immature specimens of both 
forms, all these distinctions lose their sharpness; in particular, the immature specimen 
that Hoek described under the name P. patagonicum var. elegans (1881, p. 86, PI. xii, 
fig. 10) appears to differ in no respect from specimens of P. glabra, of similar size, 
except that the lateral processes are less than their own diameter apart, the main claws 
are a little shorter, and the auxiliaries a little longer. 
Pallenopsis pilosa (Hoek). 
Phoxichilidium pilosum, Hoek, 1881, p. 90, PI. xiii, figs. 10-13. 
Pallenopsis pilosa, Hoek, 1883, p. 9; Hodgson, 1907, p. 15, PI. ii, fig. 2 ; Bouvier, 1913, 
p. 107, figs. 60 and 61. 
