656 CLASS X. 
inferior antenne small. Two pairs of cylindrical branchiz at the 
second and third segment of the trunk, in place of feet. Feet 
strong, terminated by an incurved hook, in five pairs. Mandibular 
palps none. Females furnished with large lamine at the base of 
branchiz, covering the eggs. 
Cyamus LatR. (Species of Oniscus L.). - 
Sp. Cyamus ceti LatR., Oniscus ceti L., Pycnogonwm ceti FABR., Pau, Spie. 
Zool. Fasc. 1x. Tab, 14, Dr GuER Mém. p. serv. aU Hist. des Ins. Vu. pp. 
540—544, Pl. 42, figs. 7, 8, TREVIRANUS Verm. Schr. 11. pp. 3—10, Tab. I. 
This Crustacean, whose length is about 3” and more, lives on Balena longi- 
mana; Cyamus erraticus ROUSSEL DE VAUZ., on the whale of the southern 
hemisphere, is an allied species. Cyamus gracilis Rouss. DE VAUZ. is 
smaller and more elongate than the other species, and thus approaches to 
the form of the next division. 
Comp. on this genus, besides the anatomical notices of G. R. TREVIRANUS, 
ROUSSEL DE VAUZEME, Ann. des Sc. nat., 2e Série, Tom. 1. 1834, Zool. pp. 
239—265, Pl. 8, 9, and Kroryer Natuurk. Tidsskr. tv. pp. 474—489. 
Phalanx II. Caprellina. Body mostly elongate, the length of 
the segments surpassing their breath. Feet slender. Branchie 
vesicular at the base of feet. Mandibles often furnished with 
palp triarticulate. Superior antenne setaceous at the apex, 
multiarticulate. 
Caprella LAM. Five pairs of feet, arranged in an interrupted 
series, all terminated by a subcheliform hand. ‘Two pairs of bran- 
chial vesicles in the second and third segments, in place of feet. 
Abdomen very minute, made up of a single or of two segments, 
supplied with appendages or rudiments of feet. 
Sub-genera: Caprellaand dgina KRoEYER. Sp. Caprella linearis Larr., 
Cancer linearis (li. ?), Hersst Krabben und Krebse, iv. p. 142, Tab. 36, 
figs. 9, 10;—-Oniscus scolopendroides PALL., Spic. Zool. 1x. Tab, 4, fig. 15, 
Caprella lobata Latr., GuERIN Iconogr., Crust. Pl. 28, fig. 2; to this or 
to Capr. acutifrons DESM. the figure of BAsTER, Natuurk. Uitsp. 1. Pl. tv. 
fig. 2, seems also to belong. 
Podalirius KRoEryver. 
Cercops Kroryer. Three pairs of branchial vesicles, the first 
pair at the base of the second pair of feet, the rest in place of 
feet. Abdomen distinct quinquearticulate. 
Sp. Cercops Holbelli KRonyYER |. 1. Tab. vi. figs. 1—13. 
