131 



male specimen ivom Vardo. It thus appears that the species occurs along the 

 whole coast of Norway. 



Distribution. — Bohuslan (Stockholm Museum), Kattegat (Meinert), 

 British Isles (Sp. Bate and others), coast of France (Chevreux). 



6. Bathyporeia Robertsonii, Sp. Bate. 



(PI. 44, fig. 2.) 

 Bathyporeia Robertsonii, .Sp. Bate, Cat. Amphip. Brit. Mus. p. 173, PI. XXXI, fig. 5. 



Body of the adult male comparatively slender and compressed, with 

 powerfully developed metasome. Cephalon transversely truncated in front, 

 the lateral coi'ners being not at all projecting. Coxal plates about as in the 

 preceding species. Last pair of epimeral plates of metasome evenly rounded at 

 the lateral corners. First segment of xirosome deeply impressed at the base 

 dorsally, the posterior hump having only 2 anteriorly curved bristles, but no 

 trace of any spines. Eyes rather large, oblong oval or reniform, pigment very 

 dark. Superior antennae with the l.st joint of the peduncle about twice as long 

 as the other 2 combined ; tlagellum composed of 9 articulations ; accessory ajipen- 

 dage with the terminal joint extremely small, the basal one rather strong, with 

 a tuft of slender spines in the middle of the inner edge. Inferior antennae (of 

 the adult male) scarcely exceeding half the length of the body, flagellum about 

 twice the length of the pedxincle, and composed of 17 very distinctly defined 

 articulations, each, with the exceiition of the last 2 bearing at the end 

 anteriorly a rather large calceola. Anterior gnathopoda with the propodos 

 ovate in form and about as long as the carpvxs, dactylus curved in the form 

 of a hook. Pereiopoda nearty as in B. j)elagica. Last pair of uropoda with 

 the basal joint of the outer ramus rather expanded, terminal joint very small, 

 scarcely exceeding in length Vs of the basal one. Telson about as in B. pela- 

 r/ica. Colour, according to Sp. Bate, whitish, mottled along the back with light 

 pink. Length of adult male 6 mm. 



Remarks. — On examining the British Bathyporeia (B. pelagica), the 

 Rev. Mr. Stebbing was led to the conclusion, that the 3 forms described by 

 Sp. Bate as B. pilosa, Bobertsonii and pelagica were not specifically distinct, 

 the fii'st being the female, the 2nd the young male, and the 3rd the adult 

 male of one and the same species. This may perhaps be correct as regards 

 the 1st and 3rd forms, but he was certainly wrong in referring also B. Robert- 

 sonii to the same species; for the form named so by Sp. Bate is e-\adently 

 not a young male but a fully adult one, a fact easily accounted for by the 

 presence of distinct calceolse on both pairs of antennae. In young male speci- 

 mens of B. pelagica the inferior antennae may often be found as short as in 



