189 



Occurrence. Several specimens of this form, all of the female sex, were 

 found last summer at Farsund, south coast of Norway, at a depth of from 

 20 30 fathoms, muddy sand. 



Distribution. Scottish coast (Scott). 



125. Stenhelia Normani (Scott). 



(PL CXXIV, fig. 2). 



Delavalia Normani, Th. Scott, Notes on British Copepoda, Ann. Mag. Nat. Hist. ser. 7, 



Vol. XVI, p. 569. 



Specific Characters. Female. Very like the preceding species both in 

 size and general appearance. Genital segment however more abruptly constricted 

 in the middle, and the remaining part of the urosome narrower and scarcely at 

 all attenuated behind. Caudal rami more divergent and having the setse of quite 

 normal appearance. Anterior antennse comparatively shorter and stouter than in 

 S. Giesbrechti. Posterior antennse with the outer ramus very slender, consider- 

 ably exceeding in length the last joint of the inner. 1st pair of legs of almost 

 exactly the same structure as in S. Giesbrechti. Natatory legs likewise very similar. 

 Last pair of legs with the distal joint comparatively shorter and broader, and 

 having the setse more elongated; inner expansion of proximal joint carrying 4 

 slender setse arranged in a manner similar to that in S. Giesbrechti. Ovisacs 







comparatively larger and more divergent. 



Male with the inner ramus of 2nd pair of legs somewhat unlike that in 

 the other species, distal joint rather large and slightly dilated in the middle, 

 carrying on the tip 2 unequal straight spines, outer edge with a small dentiform 

 projection beyond the middle, inner edge provided with 2 setse in the middle and 

 near the end with an elongated deflexed spine, coarsely denticulated in its outer 

 part. Last pair of legs with the distal joint very small and imperfectly defined 

 at the base, carrying 3 spines, the outermost of which is rather strong; proximal 

 joint scarcely at all expanded inside, but provided with 2 unequal setse in its 

 innermost part. 



Colour whitish. 



Length of adult female 0.46 mm. 



Remarks. This form was at first regarded by Th. Scott as only a variety 

 of 8. Giesbrechti. Recently he has however vindicated its specific distinctness, 

 and has proposed for it the above name. It is indeed closely allied to the said 

 species, but on a closer comparison some differences are found to exist which 



25 Crustacea. 



