160 University of California Publications in Zoology (Vou. 23 
scale tapers to a sharp point and has three sharp spines or branches on each 
side. The lateral plates on the left of the abdomen in the female are fringed with 
short, slender, blunt spines. 
The chelipeds extend a little beyond the middle of the propodal segment of 
the first pair of ambulatory feet. The right cheliped is stouter than the left. The 
prehensile edges of its fingers are strongly tubercular. The upper margin of the 
palm is spiny; there are also some small spines on the middle and on the lower 
margin. There are three long spines on the inner margin of the carpus. The left 
cheliped is similar but smaller, and the prehensile edges of the fingers are sharp. 
The ambulatory feet are wide and much compressed. The anterior and posterior 
margins are armed with sharp spines, alternating in general large and small. 
On the upper surface of the proximal end of the merus of the fourth pair of feet 
there is a row of fine spines; the corresponding spines on the third pair of feet 
are smaller, and on the second pair still smaller (Benedict). 
Dimensions.—Type: length of carapace and rostrum 90 mm., rostrum 9 mm., 
width of carapace 82 mm. 
Type Locality.—Off the Pribilof Islands, 688 fathoms. 
Distribution.—Pribilof Islands, to off Cortez Bank, California, 688 to 822 
fathoms (Rathbun). 
Genus Paralithodes Brandt 
Carapace armed with a number of strong, long spines. Third to fifth abdom- 
inal segments with median plates replaced by a membranous area covered by 
calcified, often spinous nodules; lateral plates of these segments in the female are 
very much larger on the left side than on the right; plates of basal (second) 
segment distinct, separated by evident sutures. 
Key TO THE CALIFORNIA SPECIES OF PARALITHODES 
I. Rostrum bifureate, tip with two well developed divergent horns; anterior lateral 
spines of rostrum reaching to apex of bifureation of rostrum. (Known 
only from 211+ fathoms.) 
rathbuni, p. 160. 
II. Rostrum simply bifid or split, two terminal spines thus formed approximated ; 
anterior lateral spines of rostrum not reaching half way to bases of term- 
inal spines. (Known only from 155 + fathoms.) 
californiensis, p. 161. 
Paralithodes rathbuni (Benedict) 
Plate 26; plate 27; plate 29, figures 6 and 7; plate 30, figures 3 and 4 
Lithodes rathbuni Benedict, Proce. U. 8. Nat. Mus., 17, 482, 1894. 
Paralithodes rathbuni Bouvier, Ann. Sci. Nat. (8), 1, 23, 1896. 
Lithodes rathbuni Holmes, Oceas. Papers Calif. Acad. Sei., 7, 131, 1900. 
Original Description—Carapace of male armed with long spines on the differ- 
ent regions; also with longer spines on the margins. There are four on the 
gastric; two short and two‘long on the cardiac region. The branchial region has 
six spines of various lengths. The posterolateral margin has the longest spine, 
being 26 mm. in length on one side and 23 mm. on the other. Both have lost 
their points. Anterior to this there are three spines, the shortest unbroken one 
being 17 mm. long; on the margin posterior to the longest spine there are four 
spines, the longest of which is 14 mm. in length and the shortest 8 mm. The 
rostrum is composed of five branches; the main stem is sharply bent upward and 
