CRUSTACEA 305 
small secondary tooth on the inner side of the innermost one; 
one male specimen has six on the right side and seven on the left 
-side, and another has eight on the right and seven on the left 
side. When there are only six teeth they are somewhat 
“distantly separated,’’ as described by Spence Bate; when the 
teeth are more numerous they are naturally less separated at 
the base. 
Spence Bate has pointed out that this species in general 
aspect agrees wth Ibacus incisus (Péron) (= J. peronw Leach). 
and might almost be considered a variety of that species; the 
differences, however, that he points out appear to be constant, 
and it is perhaps as well to consider it a separate species. 
T. incisus is found on the Australian coast, and I have specimens: 
from Port Phillip which clearly show the differences pointed 
out by Spence Bate. This writer also notes that the species 
approximates in appearance somewhat to Thenus orientalis, and 
appears to be a form nearly allied to that genus. 
In all cases in the report on the Challenger Macrura, Spence 
Bate spells the generic name Jbaccus, though, as Stebbing* has. 
pointed out, he has given no reason for so doing. 
LEANDER AFFINIS (Milne-Edwards). 
Palemon affinis M-Edw., Hist. Nat. Crust. 11., 1837, p. 391. 
G. M. Thomson, Trans. Linn. Soe. (2), viii., 1903, p. 450. 
Filhol, Mission de 1’Ile Campbell, 1885, p. 433. 
Lenz, Zool. Jahrb. xiv., heft. 5, 1901, p. 435. 
One damaged specimen from Station 89 seems to belong to 
this species. 
Several specimens from the Chatham Islands. This is a very 
common species in New Zealand seas and is circumaustral in 
distribution. 
NAUTICARIS MARIONIS Spence Bate. 
Nauticaris marionis Spence Bate, Chall. Rep. Macrura, 1888, 
p. 603, pl. evin. 
Chilton, Subant. Is. N.Z., 1909, p. 614. 
Two females with eggs and one immature specimen from 
Station 30. 
The species is widely distributed in southern seas. 
(4) Stebbing, History of Recent Crustacea, 1893, p. 194. 
