618 



7. Corophium affine, Bruzel. 



(PI. 221, fig. 2). 



CorojiliiiDit afjine, Bruzelius, Skaiul. Aniph. Gamm. p. 10. 



Syn ; Corophium teuuicorue, Normnu. 



Body somewliat more slender than in the 2 preceding species, with 

 the segments of urosome well defined. Cephalon but very slightly projecting 

 in front, lateral lobes rather, produced, and terminating in an acute point. 

 Eyes imperfectly developed, and replaced on each side by a small patch of an 

 opaque white pigment. Superior antennae rather slender and elongated, 1st 

 joint of the peduncle slightly expanded at the base, with 4 slender spines 

 on the outer edge, and at the base inside G recurved spines; 2nd joint 

 very slender and about tlie length of the 1st, flagellum not attaining 

 half the length of the peduncle, and composed of G articulations. Inferior 

 antennae in female rather feeble and scarcely as long as the superior, basal 

 joint produced inside to a long conical projection tipped with a spine, antepen- 

 ultimate peduncular joint armed with a single spine, penultimate joint 

 simple cylendrical in form, with 3 slender spines on the posterior edge, last 

 joint much shorter, and having 2 spines on the hind edge and 2 others inside; 

 inferior antenna in male very strongly developed, with the penultimate joint of 

 the jjeduncle exceedingly large and tumid, nearly fusiform in shape, and produced 

 at the end ]iosteriorly to a dentiform process accompanied by a slight trian- 

 gular projection, last joint not nearly attaining half the length of the former 

 and rather narrow, being produced at the end inside to a dentiform projection. 

 Anterior gnathopoda with the propodos very narrow, not at all widening 

 distally, and having the dactylus, as in tlie posterior ones, bidentate at the 

 tip. Anterior pairs of pereiopoda with the meral joint not very much 

 expanded, dactylus very slender, exceeding in lengtli the last 2 joints com- 

 bined. Last pair of pereiopoda exceedingly slender and elongated, with the 

 basal joint but very little expanded, and the posterior edge slightly concave. 

 The 2 anterior pairs of uropoila with the terminal spines elongated to an unusual 

 extent; last pair very narrow, with the terminal joint linear and setous 

 only at the tip. Telson nearly as long as it is broad, tip narrowly truncated. 

 Body of a uniform pale yellowish hue, without any pigmentary ornament. 

 Length of adult male 4 mm. 



licmarJis. — This species, established by Bruzelius, is easily distin- 

 guishable from any of the other species by the absolute want of pigmentary 

 ornament, the imperfectly developed eyes, and the structure of the antennae 

 in the two sexes. Moreover the last pair of pereiopoda are markedly distin- 



