EEVISION OF L.M.B.C. AMPHIPODA. 443 



the immature male of P. falcatus (see Sars, PL 212 p.^ 

 male ^). The specimen from tidal pool, Colvvyn Bay, 

 5 mm. long has all the appearance of a young male of 

 P. falcatus but the lower antennae have the last joint of 

 the peduncle and the first of the flagellum densely clothed 

 with the plumose setas characteristic of the adult male. 

 The tooth at the base of the palm of the second gnatho- 

 pod is more pointed, and that on the dactylus scarcely so 

 large as in the typical form but hardly two specimens 

 are exactly alike in these points, especially the latter. As 

 to the females of all three species, I confess that I am 

 unable to see any difference between them except in size. 



Podocerus variegatus (Leach) (PI. XIX., fig. 21). 



17 miles X. W. of Mersey Bar, 27/9/90; Menai Straits 

 7 f., 30/5/94. Whitish variegated with red. Length 7 mm. 

 There has been much controversy about this species. 

 Boeck (Crust. Amph. bor. and arct.) describes Janassa 

 capillata (Rathke) under the name of J. variegata, Leach, 

 while Nebeski (Beitr z. Kenntniss der Amph. der Adria) 

 unites it with P. falcatus to the female of which it bears 

 a considerable resemblance in the form of the second 

 gnathopod. It may, however, be at once recognised by 

 the more robust antennae and the difference in the flagel- 

 lum of the upper. In P. variegatus the flagellum is four- 

 jointed, the first joint being nearly twice as long as the 

 remaining three which are subequal. There is a distinct 

 secondary appendage which is about Jth the length of the 

 first joint. In P. falcatus the flagellum is seven-jointed, 

 the first joint rather shorter than the three following; 

 the secondary appendage about jth the length of the 

 first joint. In P. variegatus the second gnathopods do 

 not differ materially in the two sexes except in size, those 

 of the male proportionally much the larger. 



From Janassa capillata (Eathke) this species may be at 



