113 



formerly supposed by consulting the statements given by the said authors. 

 Yet the species may at once be distinguished both from this and the other 

 species (P. dilatatus) by the much shorter and stouter caudal rami. 



Occurrence. A solitary fully adult female specimen of this form was 

 taken last summer at Hval0r, outside the Ghristiania Fjord, from a depth of 

 about 10 fathoms. 



Distribution. British Isles (Brady, Scott). 



Fam. Sapphirinidae. 



Gen. Sapphirina, Thompson, 1829. 



Generic Characters. Body more or less conspicuously depressed and 

 rather unlike in the two sexes, that of male much broader than in female and 

 blade-like, with the epimeral plates of both the anterior and posterior divisions 

 lamellarly expanded, exhibiting moreover, in the living animal, a beautiful 

 iridescent or opaline lustre. Head generally well defined from the 1st trunkal 

 segment, and provided in front with 2 closely set cuticular lenses (conspicilla), 

 behind which, as in Corycceus, at some distance 2 rod-like, pigmented strings 

 occur, each terminating in a highly refractive body. 1 ) Tail much narrower 

 in female than in male, and in both sexes composed of 5 well defined seg- 

 ments. Caudal rami blade-like, with the marginal setae very small. Anterior 

 antennae alike in the two sexes, and rather short, with the number of joints 

 somewhat reduced. Posterior antennae distinctly prehensile, terminating in a 

 short and stout claw. Oral parts built on the very same type as in the 

 Lichomolgidce. Natatory legs well developed and more or less incurved, with 

 both rami 3-articulate. Last pair of legs very small, uniarticulate, extended 

 laterally. 



Remarks. This genus was established by I. V. Thompson as early as 

 the year 1829, when our knowledge of the marine Copepoda was still very 

 imperfect. The species observed by that zoologist (S. indicator) cannot be 

 identified; but it is evident that he has had before him male specimens of 

 some species belonging to the present genus, the brillant iridescence of their 

 bodies having at once attracted his attention. The genus comprises numerous 



l ) As to the significance of this apparatus, I may refer to the note given in Vol. VI, p. 195, 



