86 CYAMIDJE. 



Bosc. Hist. Crust, ii. pi. xvi. fig. 2. SAVIGNT, 

 Mem. i. pi. v. LATREILLE, Hist. n. Crust. &c. vi. 

 p. 331, pi. lii. fig. 4. Genera Ins. t. i. pp. 60, 176. 

 DESAIAREST, Cons. Crust, p. 280, pi. xlvi. fig. 4. 

 WHITE, Pop. Hist. Brit. Crust, p. 219, pi. xi. 

 fig. 6. Cat. Brit. Crust, p. 62. SPENCE BATE, 

 Cat. Arnph. Brit. Mus. p. 366, pi. Iviii. fig. 2. Ann. 

 Nat. Hist. Feb. 7, 1857. LEACH, Edinb. Enc. vii. 

 p. 404 (Panope Ceti). Trans. Linn. Soc. xi. p. 364 

 (Larunda C.). Suppl. Enc. Brit. i. p. 426, pi. xxi. 

 SAMOUELLE, Ent. Cornp. p. 106. M. EDWARDS, Hist, 

 d. Crust, iii. p. 113. TREVIRANUS Verm. Schrift, ii. 

 p. 1. Die "VVallnschlaus, pi. i. 



Cyamus erraticus. ROUSSEL DE VAUZEME, Ann. Sc. Nat. 2nd Ser. t. i. 



p. 259, pi. viii. fig. 22, 23. MILNE EDWARDS, Hist. 

 N. Crust, iii. p. 113. GOSSE, Mar. Zool. i. p. 131 

 (not of Spence Bate, Cat. Amph. Brit. Mus. p. 368). 



ALTHOUGH the early descriptions of the whale louse, of 

 which, until recently, it was supposed that there was but 

 a single species, are vague, the figures and locality suffi- 

 ciently indicate that the creature, so beautifully figured 

 by Savigny, in the first volume of his " Memoires," and 

 which is identical with the one represented in the above 

 woodcut, was the species intended by Linnaeus, De Geer, 

 &c., the early representations of which exhibit only a 

 single linear appendage attached on each side of the third 

 and fourth segments of the body. We presume likewise, 

 and are confirmed herein by M. Milne Edwards, that the 

 C, erraticus of M. Roussel de Vauzeme is intended for the 

 same species ; his figure probably, from its narrower size, 

 representing a male. The fact of several distinct species 

 having been found to infest the whale, was doubtless the 

 reason which induced the last-named observer to sink the 

 specific name Ceti as of generic extent ; but this principle 

 is at variance with the rules of the best zoological no- 

 menclaturists. By some oversight, Mr. Spence Bate, in 

 his work on the Amphipoda (pp. 366, 068), has given 

 C. ceti and erraticus as distinct species, referring, under 



