666 



projection occurring about in the middle, the two being defined by a narrow- 

 sinus, posterior angle rather prominent and tipped with a small spine; pos- 

 terior gnathopoda in male of a rather diiferent shape, the propodos being 

 considerably expanded in its proximal part, and clothed all over with delicate 

 cilia, ]ialm deeply excavated in the middle, and having posteriorly 2 diverging, 

 triangularly pointed projections, dactylus very strong and densely setous. 

 Branchial laraellse very small and narrow. The 3 paii's of pereiopoda not 

 very strong, and rapidly increasing in length, propodal joint rather narrow, 

 though with the palm distinctly defined. Body light yellowish, pellucid, 

 without any pigmentary ornament. Length of adult female 11 mm., of 

 male 13 mm. 



Remarks. — This species was first described by tlie author, in the 

 above quoted paper, from male specimens. The female somewhat resembles 

 that of C. linearis, but is easily distinguished by its more slender and per- 

 fectly smooth body, and more particularly by the greater length of the an- 

 tepenultimate body-segment. In the male sex, this form cannot be confounded 

 with any of the other species, being highly distinguished by the peculiar 

 shape of the i)ropodos of the posterior gnathopoda and its dense clothing 

 of cilia. 



Occurrence. — 1 have met with this form occasionally in several 

 places of the west coast of Norway, as also in the Troudhjemsfjord. It is 

 a true deep-water form, only occurring in depths ranging from 50 to 100 

 fathoms. Out of Norway it has not yet been lecorded. 



14. Caprella acaiithifera. Leach. 



(I'l. 239, fig. 3). 



Caprella iiainthifci-a,lit'-dch, Ediiil). Encycl. VII, p. iOi. 



Syn. : Capu'lla ncmiiinitVni, Desm. 

 » — :umata, Heller. 



» — lei)toiiyx, Heller. 



> — oalva, Sp. Bate. 



> — liystrix, Kroyer. 



Female. — Body compai'atively short and stout, with the back con- 

 spicuously spinous, and the antepenultimate segment not longer than the 

 last 2 combined. Cephalosome perfectly smooth, and of a somewhat unusual 

 shape, being transversely truncated in front and strongly gibbous in front 

 of the cervical impression. First free body-segment with 2 juxtaposed dorsal 



