45 



with the outer edge smooth, the inner clothed with a few bundles of small 

 spinules. 



Body in the living animal, according to Thorell, of a whitish grey hue, 

 with the ripe ova fuscous green. 



Length of adult female 2.30 mm. 



Male unknown. 



Remarks. This form exhibits in its general apearance a rather close 

 resemblance to D. pulex, and may indeed at the first sight easily be con- 

 founded with it. It is however of much inferior size, and, on a closer inspection, 

 is found to differ conspicuously in the shape of the incubatory pouch. In the 

 structural details, moreover, several well-marked differences are found, as 

 indicated in the above diagnosis. The form recorded by Brady as D. Normani, 

 seem to be very closely allied to the present species, but, to judge from the 

 figures given by that author, it is scarcely the same species. 



Occurrence. Some few female specimens of this form were selected from 

 material collected, many year ago, on the western coast of Norway, the exact 

 locality not being ascertained. 



Distribution. Coast of Bohuslan (Thorell), coast of France (Canu). 



11. Doropygus porcicauda, Brady. 



(PI. XXII). 



Doropygus porcicauda, Brady, Monogr. British Copepoda, Vol. I, p. 158, PI. XXVII, figs. 19, 



PI. XXXIII, figs. 1416. 



Specific Characters. Female. Body comparatively somewhat more slender 

 than in the 2 preceding species, with the hind edge of the head and the 3 ante- 

 rior trunkal segments elevated on each side dorsally to a small knob-like pro- 

 minence. Incubatory pouch of very large size and greatly prominent behind, 

 extending far beyond the limits of the tail, and terminating in an obtuse point. 

 Tail unusually short, scarcely exceeding in length Va of the anterior division, 

 and composed of 4 segments, the penultimate of which exhibits a slight indi- 

 cation to a subdivision; last segment not expanded distally, though, as in the 

 2 preceding species, deeply cleft behind in the middle. Caudal rami of rather 

 a peculiar shape, being greatly prolonged and terminating in a very flexible 

 thin lash, which may be curled up in a remarkable manner, as indicated in 

 the figure given by Brady. Anterior antennas rather elongated, being fully as 

 long as the head, and composed of 9 well defined joints, the first 2 of which, 

 as usual, are much the largest, though combined scarcely exceeding half the 



