CYAMUS OVA LI S. 



AMPHIPQDA. 



ABEURAXTIA. 



91 



C YAM I DM. 



CYAMUS OVALTS. 



Specific character. Body depressed, elliptic-ovate, with tlie segments not 

 gaping apart at the sides. Third and fourth segments of body, with two pairs 

 of branchiae on each side, of unequal length ; those of the third segment 

 having at the base only a short slender appendage, those of the fourth seg- 

 ment having two appendages of unequal size at the base. Hand of the 

 second pair of legs with two obtuse teeth. 



Length about half an inch. 



Cyamus oralis. ROUSSEL DE VAUZEME. Ann. Sci. Nat. 2nd ser. vol. i. 



p. 259, pi. 8, tig. 1-21. MILNE EDWARDS, Hist. N. 

 Crust, iii. p. 113. Ann. Sci. Nat. 2nd ser. iii. pi. 14, 

 fig. 13, 14. Regne An. ed. Crochard Crust, pi. 63, 

 fig. 3. GUERIN, Icon. R. An. Crust, pi. xxviii. fig. 4. 

 WHITE, Pop. Hist. Brit. Crust, p. 219. Cat. Brit. 

 Crust., p. 62. GOSSE, Marine Zool. i. p. 31. SPENCE 

 BATE, Cat. Ainph. Brit. Mus. p. 367, pi. Iviii. fig. 3. 

 Ann. Nat. Hist. (Feb. 1857), 2nd ser. xix. p. 152. 



THIS species is indicated as British by Mr. Adam 

 White in his " Catalogue of the British Crustacea," but 

 we have seen no specimen which we are able to identify 

 w r ith M. Roussel de Vauzeme's figures, which we have 

 consequently been under the necessity of copying in the 

 accompanying woodcut.* This species is at once distin- 

 guished from C. ceti by its elliptic-ovate form, by the 



* The figure on the right hand represents the male, seen on its ventral 

 surface, whilst the left-hand figure represents the under surface of the body 

 of the female, showing the incubatory pouch. 



