186 



Colour whitish, with a slight yellowish tinge. 



Length of adult female 0.80 mm. 



Remarks. This form was recorded by Prof. Brady as early as the year 

 1 868, and was subsequently described and figured by the same author in his well- 

 known Monograph as the type of the genus Delavalia. Though differing in some 

 points from the 3 preceding species, it ought, in my opinion, to be considered as 

 congeneric with them, the differences being of only specific value. It is much 

 the largest of the Norwegian species. 



Occurrence. I have only met with this form in a single locality not far 

 from Christiania. It occurred there not unfrequently at a depth of about 3 fathoms, 

 muddy bottom. 



Distribution. British Isles (Brady). 



123. Stenhelia reflexa (Brady). 

 (PI. cxxm). 



Delavalia reflexa, Brady, Monogr. British Copepoda, Vol. II, p. 45, PI. LI, figs. 18, 11, 13 



(not figs. 9, 10, 12, 14). 



Specific Characters. Female. Body short and robust, with the anterior 

 division considerably dilated, the posterior much narrower and slightly tapered 

 behind. Rostrum rather prominent and rapidly attenuated, with the apical part 

 narrowly linguiform in shape. Urosome not much shorter than the anterior divi- 

 sion, genital segment conspicuously dilated in front, anal segment larger than the 

 preceding segment. Caudal rami about the length of the anal segment, and slightly 

 tapered distally, apical setae slender, the outermost one of unusual length. Anterior 

 antennae somewhat more slender than in the preceding species, otherwise of the 

 usual structure, all the joints well defined. Posterior antennae with the outer 

 ramus much shorter than the last joint of the inner, terminal joint not attaining 

 the length of the 1st. Mandibular palp with the basal part somewhat dilated in 

 the middle, inner ramus very narrow and abruptly reflexed, carrying on the tip 

 only 2 setae, the one, as usual, much elongated and falciform. Maxillae and 

 maxillipeds about as in S. gibba. 1st pair of legs with the outer ramus about 

 the length of the inner, middle joint with a well-developed seta inside, last joint of 

 about the same size, and carrying 3 slender spines and 2 somewhat unequal setae; 

 inner ramus, as in S. palustris, consisting of only 2 joints, the last one equal in 

 length to the 1st, and carrying near the base inside a ciliated seta, tip armed 

 with a slender spine and 2 somewhat longer setae. Natatory legs rather strongly 



