86 CYAMIDA. 
Bosc. Hist. Crust. ii. pl. xvi. fig. 2. Savieny, 
Mem. i, pl.v. Larreriie, Hist. n. Crust. &c. vi. 
p. 331, pl. li. fig. 4. Genera Ins. t. i. pp. 60, 176. 
DesmArEst, Cons. Crust. p. 280, pl. xlvi. fig. 4. 
Wuirr, Pop. Hist. Brit. Crust. p. 219, pl. xi. 
fig. 6. Cat. Brit. Crust. p. 62. Spence Bars, 
Cat. Amph. Brit. Mus. p. 366, pl. lviili. fig. 2. Ann. 
Nat. Hist. Feb. 7, 1857. Luacu, Edinb. Ene. vii. 
p. 404 (Panope Ceti). Trans. Linn, Soe. xi. p, 364 
(Larunda C.). Suppl. Ene. Brit. i. p. 426, pl. xxi. 
Samovgetie, Ent. Comp. p. 106. M. Epwarps, Hist. 
d. Crust. iii. p. 113. Trevrranus Verm. Schrift, ii. 
p- 1. Die Wallfischlaus, pl. i. 
Cyamus erraticus. Rousse pe Vauzeme, Ann. Sc. Nat. 2nd Ser. t. i. 
p. 259, pl. vili. fig. 22, 23. Minne Epwarps, Hist. 
N. Crust. iii. p. 118. Gossr, Mar. Zool. i. p. 131 
(not of Spence Bate, Cat. Amph. Brit. Mus. p. 368). 
AuruouGu 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 ‘ Mémoires,” and 
which is identical with the one represented in the above 
woodcut, was the species intended by Linnzus, 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, 368), has given 
C. ceti and erraticus as distinct species, referring, under 
