ae 
SPIROPAGURUS OCCIDENTALIS. 59 
Length of carapace, 5.5 mm.; abdomen, 8 mm.; cheliped, 12.5 mm.; 
last ambulatory leg, 17.5 mm.; ocular peduncle, 2.5 mm. 
Station 3355. 182 fathoms. 1 male, without carcincecium. 
This species differs much from the more typical species of Catapagurus, 
C. sharreri A. M. Edw. and C. gracilis Smith, in the shortness of its chelipeds 
and ambulatory limbs, the symmetry of its chelipeds, and the length of the 
protruded vas deferens. It is more nearly related to C. australis Henderson.* 
It would seem to have a close general likeness to Pagurodes pilifer Hender- 
son, but the gills in C. diomedew are of the phyllobranchiate type. 
SPIROPAGURUS Srurs. 
Proc. Acad. Nat. Sci. Phila., X. 236, 1858. 
Spiropagurus occidentalis Fax. 
Plate XIV., Fig. 1-1". 
Bull. Mus. Comp. Zool., XXIV. 172, 1893. 
The carapace is smooth and naked except on the sides of the branchial 
regions where a few hairs arise; the branchial regions are swollen, mem- 
branaceous, and covered with a net-work of white lines; the cardiac region is 
long and narrow ; the portion of the carapace in front of the cervical groove 
is calcified, produced in the median line anteriorly to form a short, broad, 
and obtuse rostrum, which does not conceal the ophthalmic segment; the 
lateral teeth are acute and project as far as the rostrum does; they form 
a sharp demarcation between the front and the oblique antero-lateral border 
of the carapace. 
The ophthalmic scales are triangular, with simple tips. The ocular pedun- 
cles are enlarged at the distal end, hardly overreaching the distal end of the 
second segment of the antennular flagellum, and the third segment of the 
antennal flagellum. The last segment of the antennular peduncle is more 
than twice as long as the penultimate segment. The second segment of the 
antennal peduncle is produced externally into a long, sharp tooth; the 
antero-internal angle is likewise armed with a small spine; the acicle is long, 
sharp, curved, and furnished with sete, as are also the several joints of the 
peduncle. 
The chelipeds are subequal, the right chela being appreciably larger 
* Rep. Challenger Anomura, p. 76, Plate VIII. Fig. 1, 1888. 
