414 THE VOYAGE OF H.M.S. CHALLENGER. 



abdominal bristles and of nearly equal length, forming a brush. Last segment of abdomen 

 with two terminal bristles. Last segment of the limbs from the third to the seventh, 

 with a long, straight claw directed forwards. Fringed limbs behind this point very small. 

 Outer or second antennas half as long as the first, which embrace eleven segments, and are 

 about as long as the last five abdominal segments. Total length of head and body 2'1 lines 

 or -0045 m. There are few conspicuous hairs, the most so are those which stand at the 

 extremity of the last joint of the limbs, rising from the base of the claw. Color trans- 

 lucent." 

 S. I. Smith, 1875, considers Cope's description very inadequate, but identifies the genus Stygo- 

 hromus with the earlier Crangonyx. 



1872-3. Dall, William Healey, born August 21, 1845 (S. I. Smith). 



Descriptions of three new species of Crustacea parasitic on the Cetacea of the 

 N. W. Coast of America. The Annals and Magazine of Natural History. Number 

 LXII. Vol. XL— Fourth Series. London, 1873. pp. 157-158. (From Pro- 

 ceedings of the California Academy of Sciences, November 1872.) 



He describes the three species as follows : — 



" Cyaiims Scammoni, n. sp. — Male. Body moderately depressed, of an egg-ovate form; 

 segments slightly separated ; third and fourth segments furnished with a branchia at each 

 side ; this, near its base, divides into two cylindrical filaments spirally coiled from right to 

 left; at the base of each branchia are two slender accessory filaments not coiled, quite 

 short, and situated one before and the other behind the base of the main branchia ; second 

 pair of hands kidney-shaped, with the carpal articulation halfway between the distal and 

 proximal ends, and having two pointed tubercles on the inferior edge, before the carpal 

 joint ; third and fourth segments somewhat punctate above, all the others smooth, the 

 sixth and seventh slightly serrate on the upper anterior edge, and without ventral spines. 

 Colour yellowish-white. Long. -70, lat. '39 in., of largest specimen. 



" Female similar to the male in all respects, except in being a little more slender, and in 

 wanting the accessory appendages to the branchise ; the ovigerous sacs are four in 

 number, overlapping each other. 



" Hah. On the California grey whale {Rhaeliianedes glaucus of Cope) on the coast of 

 California, very numerous." 



" Cyamus siiffusus, n. sp. — Body flattened, elongate ; segments subequal, outer edges widely 

 separated; branchias single, cylindrical, slender, with a very short papUliform appendage 

 before and behind each branchia ; superior antenn* unusually long and stout ; first pair 

 of hands quadrant-shaped ; second pair sUghtly punctate, arcuate, emarginate on the 

 inferior edge, with a pointed tubercle on each side of the emargination ; third joint of the 

 posterior legs keeled above, with a prong below ; pleon extremely minute ; segments all 

 smooth ; no ventral lines on the posterior segments. Colour yellowish-white, suffused 

 with rose-purple, strongest on the antennre and branchia. Length '4:1, breadth (of body) 

 ■25 in. All the specimens which have passed under my observation, some eight or ten in 

 number, were males. 



"Hah. On the 'humpback' whale (Megajiiera versabilis, Cope), Monterey, California." 



" Cyamiis mysticeti, n. sp. — Body flattened, subovate, segments adjacent; branchiae single, 

 short, stout, pedunculated, a single papUliform appendage behind each; head short and 

 wide ; first pair of legs very small ; hands all simple and smooth, fingers greatly 

 recurved ; carpal articulation in the second pair of hands halfway between the proximal 



