158 Miscellaneous. 



little more slender, and in wanting the accessory appendages to the 

 branchiaj ; the ovigerous sacs are four in number, overlapping each 

 other. 



Hah. On the California ^rej y^]iale{WiacManectes glaucus of Cope) 

 on the coast of Cahfornia, very numerous. This species is named in 

 honour of Capt. C. M. Scammon, U.S. Rev. Marine, well known by 

 his studies on the cetaceans. The specimens here described were 

 collected and submitted by him for description, and will be figured 

 in his forthcoming monograph of the West Coast whales. I may 

 remark here that thesQ species are all so distinct from those figured 

 by Milne-Edwards, Gosse, Bate, and AVestwood, that a comparative 

 description has seemed unnecessary — also that the species obtained 

 on different species of cetaceans have so far been found invariably 

 distinct. The inference is, of course, that each cetacean has its 

 peculiar parasites, a supposition which agrees with our knowledge of 

 the facts in many groups of terrestrial animals. 



Gyamus stiffusus, n. sp. — Body flattened, elongate ; segments sub- 

 equal, outer edges widely separated ; branchia; single, cylindrical, 

 slender, with a very short papiUiform appendage before and behind 

 each branchia ; superior antennoe unusually long and stout ; first pair 

 of hands quadrant-shaped ; second pair slightly pu&ctate, 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 aU smooth ; 

 no ventral lines on the posterior segments. Colour yellowish white, 

 suffused with rose-purple, strongest on the antennae and branchiae. 

 Length -41, 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 (Megaptera versabilis, Cope), 

 Monterey, California. 



Gyamus mysticeti, n. sp. — Body flattened, subovate, segments ad- 

 jacent ; branchiae single, short, stout, pedunculated, a single papiUi- 

 form 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 and distal ends of the hand ; pleon very minute. Colour 

 dark brownish yellow. Length -33 in., breadth (of body) -16 in. 

 Two female specimens. 



Hab. On the northern " bowhead " whale (probably Balcena mys- 

 ticetus, Linn.), near Behring Strait. 



This is the most compact of the three species, as well as the smallest. 

 I find, in comparing large series of G. ScammonI, that a considerable 

 variation in form obtains, so far as regards comparative length and 

 breadth, even in adult specimens, and these differences are greater 

 than those observed, in the same characters, between the sexes. — 

 Proc. Galif. Acad. Sci., Nov. 1872. 



