THE HIGHER CRUSTACEA OF LIVERPOOL BAY. 249 



regularly spotted or speckled with bright crimson. 



11. Ampldloclias marmdens, Bate. 



As illustrating how little dependence can be placed on 

 colour in the determination of species, I may mention that 

 among several specimens taken at the same time all, except 

 one, ichuh teas bright scarlet, were mottled with brown, and 

 in one or two instances, almost entirely black. 



12. Pleustes glaher, Boeck. 



PJeustes (Paramphithoe) assimilis, G. 0. Sara. 



It appears to be somewhat doubtful whether these are 

 specifically distinct. The principal distinction is in the 

 hinder angle of the third pleon segment, and this is vari- 

 able in the few specimens I have, which seem rather refer- 

 able to the var. assimilis. Mr. D. Eobertson also suggests 

 the identity of the two species.* I prefer to retain the 

 older genus Pleustes, as expanded by Boeck, in place of 

 Parampliitlioe, for which there seems to be no necessity.! 



13. Tritceta dolichonyj', Nebeski. (PI. XVI., figs. 4 and 6.) 

 I have little doubt that this is the adult male of T. 



gihhosa (Bate). Only the males appear to have the cha- 

 racteristic excavation in the anterior edge of the hand of 

 the second gnathopods, and both Mr. D. Eobertson^ and 

 myself (Puffin Island, on Compound Ascidians) have taken 

 them associated with T. gihhosa. It has been taken in the 

 Adriatic and the Canary Islands. § 



14. Atijlus falcatus, Metzger.jl 



A. uncinatus,G. 0. Sars (OversigtafNorges Crust., p. 101, pi. v., 1882). 

 A. falcatus, Hoek (Tijdsclirift der Nederlaiid. Dierk. Vereen, 1889, Deel 

 ii,, p. 26, pi. viii). 



* A Contribution towards a Catalogue of the Amphipoda and Isopoda of the 

 Fn-th of Clyde. Trans, of the Glasgow Nat. Hist. Society, 1888, p. 94. 

 + " Challenger" Report on Amphipoda. Stebbing, pp. 424 — 870. 

 X Stebbing I.e., p. 520. 



§ Walker, " Proc. Liverpool Biol. Society," Vol. IL, p. 130 (1888). 

 II Die wirbellosen Mceresthiere der ostfriesischen Ktiste, Hannover, 1871, 



