28 University of California Publications in Zoology [VoL 23 
Pasiphaea magna Faxon? 
Pasiphaea magna Faxon, Bull. Mus. Comp. Zool., 24, 209, 1893; Mem. Mus. 
Comp. Zool., 18, 176, pl. 45, figs. 2-2c, 1895. 
Pasiphaea magna? Rathbun, H. A. E., 10, 19, fig. 1, 1904. 
a b 
Fig. 13. Pasiphaea magna, a, lateral view of carapace, X 44 (after Faxon); 
b, telson, X 1144 (from Rathbun, U. S. N. M.). 
Miss Rathbun had a number of specimens from California which she doubt- 
fully referred to this species. Regarding them, she said (1904, p. 19): 
‘‘The identification of these specimens with P. magna is doubtful, but as I 
have not had the opportunity of comparing them with the type, they are placed 
here provisionally. Though from the same depth of water, the integument is much 
firmer in our examples than in the type, the carapace is deeper and its dorsal 
outline less arched, the branchial ridge is straighter throughout the posterior half 
of its course, the palm of the first pair of chelae is longer than the fingers. 
The largest specimen, an ovigerous female...is 155 mm. long. The telson 
is a little longer than the sixth segment of the abdomen, and reaches about to 
the end of the inner uropod; it is broadly channeled, extremity truncate or slightly 
convex, and armed with about 13 slender bristles....In the first pair of legs the 
palm is about one-third longer than the fingers; in the second pair the right 
merus has 14 spines, the left 13. 
Characters —Of Pasiphaea magna, taken from Faxon: Carapace a little less 
than two-fifths of the length of the whole body; laterally compressed, dorsally 
carinate; carina rounded, except on anterior part of gastric area, where it assumes 
the form of a sharp keel, and is continuous with the acute-tipped, blade-like tooth 
which simulates a true rostrum; this tooth reaches forward nearly to the anterior 
extremity of the eyes; its lower margin is convex, with its hinder part resting 
closely upon and apparently anchylosed with the frontal region of the carapace. 
Palm of first pair of legs somewhat shorter than the dactylus; merus armed with 
four or five spines on its inferior edge. Second pair of legs a little longer than 
the first pair, with a longer and more slender chela. The second segment (basi- 
podite) is armed with a small spine at the distal end of the inferior edge; inferior 
edge of merus armed with thirteen spines; carpus armed with one long spine at 
distal end of lower margin. All abdominal segments dorsally carinated; carina 
obsolescent on first segment. . 
Dimensions.—Type of P. magna: length 145 mm.; carapace, including anterior 
dorsal tooth, 55 mm. 
Type Locality—Gulf of Panama, 458 fathoms (‘‘ Albatross’’ station 3384). 
Distribution.—Also taken by the ‘‘Albatross’’ from off Point Arena to off 
Point Loma, California, 276 to 552 fathoms. 
