121 



1st free segment of the metasome and part of the 2nd dark reel, anterior antennae 

 and basal part of the legs more or less tinged with chestnut brown. 



Length of adult female slightly exceeding 1 mm. 



Remarks. This form was first detected by Normand and was described 

 and figured under the MSname proposed by that author in Brady's well-known 

 Monograf. It is a very fine and easily recognizable species, being especially 

 distinguished by the very prominent rostrum, and in the living state also by the 

 beautiful colouring of the body. 



Occurrence. I have met with this form occasionally in several places both 

 off the south and west coasts of Norway, as also in the outer part of the Trond- 

 hjem Fjord. It generally occurs in depths ranging from 6 to 20 fathoms among 

 Laminarise and other algae. 



Distribution. British Isles (Brady), coast of France (Canu). 



77. Rhynchothalestris helgolandica (Claus). 



(PI. LXXV). 

 Thalestris helgolandica, Claus, Die freilebenden Copepoden, p. 131, PI. XVII, figs. 1221. 



Syn: Thalesttis curticauda, Boeck. 



Specific Characters. Female. Body comparatively short and stout, with 

 the anterior division somewhat depressed and very sharply marked off from the 

 posterior. Cephalic segment large and deep, with the epimeral parts abruptly 

 curved in front of the middle; rostrum somewhat smaller than in the preceding 

 species but of a very similar structure. Last segment of metasome abruptly much 

 narrower than the others, with the epimeral parts very small, acute. Urosome 

 unusually short, not nearly attaining half the length of the anterior division, 

 genital segment imperfectly divided in the middle, and much dilated, with the 

 lateral edges lamellar and strongly arcuate; posterior corners of this and the 

 succeeding segment slightly produced. Caudal rami very short, apical setae of 

 moderate length. Anterior antennae rather slender and of a similar structure to 

 that in R. rufocincta. Posterior antennae likewise rather similar, though having 

 the outer ramus less fully developed, with the terminal joint much shorter. Pos- 

 terior maxillipeds unusually slender and elongated, with the hand rather narrow 

 and almost crescent-like in shape, dactylus very long, falciform. 1st pair of legs 

 much more slender than in the preceding species, with both rami rather narrow, 

 the outer one being the longer and having fhe terminal joint scarcely at all ex- 

 panded, one of the claws much longer than the others ; inner ramus likewise with 



