96 



AMPH1PODA. 



ABERRANT! A. 



CYAM1D.E. 



CYAMIDM* 



CYAMUS THOMPSONI. 



Specific character. Head triangular ; antennae very short ; two middle 

 segments of body narrower than the preceding and following. First and 

 second pairs of legs equal in size, and not larger than the posterior pairs. 

 Third and fourth segments with a single very short oval branchia on each 

 side. 



Length about one-sixth of an inch. 



Cyainus Tkompsoni. GOSSE, Mar. Zool. i. p. 131. Ann. Nat. Hist. xvi. 



p. 30, pi. iii. fig. 11 (1855). WHITE, Pop. Hist. 



Crust, p. 219, fig. 225. 

 Cyamus Thomsoni. SPENCE BATE, Cat. Amph. Brit. Mus. p. 368, 



pi. Iviii. fig. 5. Ann. Nat. 2nd ser. xx. p. 525 



(Jan. 1858). 

 Cyamus Delphinii. GURIN M^NEVILLE, Iconogr. E. An. Crust, texte 



p. 25, pi. xxviii. fig. 5 (adult state ?) 

 Cyamus gracilis. SPENCE BATE, Ann. Nat. Hist. 2nd ser. xix. p. 152 



(Feb. 1857). 



THE animal which forms the type of Mr. Gosse's 

 species is fortunately preserved in the British Museum 

 collection, and has served us for the accompanying figure. 

 It is evidently in an immature state, as shown by the 

 small size of the antennae, the uniform size of the legs, 

 and the rudimental condition of the branchiae ; the legs, 

 however, are considerably stronger than in the young 



