656 CLASS x. 



inferior antennas small. Two pairs of cylindrical branch iae 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 lamina? at the base of 

 branchiae, covering the eggs. 



Cyamus LATR. (Species of Oniscus L.). 



Sp. Cyamus ceti LATR., Oniscus ceti L., Pycnogonum ceti FABR., PALL. Splc. 

 ZooL Fasc. ix. Tab. 14, DE GEEE Mem. p. serv. a I'Hist. des Ins. vn. pp. 

 540 544, PI. 42, figs. 7, 8, TBEVIRANUS Verm. Schr. n. pp. 3 10, Tab. I. 

 This Crustacean, whose length is about |" and more, lives on Balcma 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 Se"rie, Tom. i. 1834, Zool. pp. 

 239 265, PI. 8, 9, and KROEYER NatuurJc. TidssTcr. rv. pp. 474489. 



Phalanx II. Caprellina. Body mostly elongate, the length of 

 the segments surpassing their breath. Feet slender. Branchia3 

 vesicular at the base of feet Mandibles often furnished with 

 palp triartieulate. Superior antennas 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 : Caprella and ^Egina KROEYER. Sp. Caprella linearis LATR., 

 Cancer linearis (L. ?), HERBST Kraliben und Krebse, iv. p. 142, Tab. 36, 

 figs. 9, 10; Oniscus scolopendrotdes PALL., Spic. ZooL ix. Tab. 4, fig. 15, 

 Caprella lobata LATR., GU^RIN Iconogr., Crust. PL 28, fig. 2 ; to this or 

 to Capr. acutifrons DESM. the figure of BASTER, Natuurk. Uitsp. i. PI. iv. 

 fig. 2, seems also to belong. 



Podalirius KROEYER. 



Cercops KROEYER. 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 Holbcelli KROEYER 1. 1. Tab. vi. figs, i 13. 





