G. O. Sars. 



Section Anostpaea. 



Farq. Branchipodidee. 



Gen. Streptocephalus, Baird. 



Re marks. — This genus was established by Baird in 

 the year 1852, and is chiefly characterised by the peculiar 

 structure of the male prehensile antennæ. As I have only 

 found the Australian species described below in the 

 female sex, I have been somewhat in doubt as to its true 

 systematic place among the Branchipodids. In its external 

 appearance it shows, however, a rather close resemblance 

 to the female of the species Streptocephalus similis from 

 St. Domingo, and as it seems to differ in some points 

 rather markedly from the females of other Branchipodid 

 genera, I have felt justified in referring it provisionally to 

 the above-named genus. 



Streptocephalus Archeri, G. O. Sars, n. sp. 

 (PL I). 



Specific Characters. — Female. Body very slender, 

 with the anterior division about the length of the posterior 

 (excluding the caudal rami). Head exhibiting on the 

 dorsal face a small, but well-defined rounded quadrangular 

 and somewhat elevated area. Eyes comparatively large, 

 pyriform, with the corneal part globularly expanded and 

 the pigment very dark. Ocellus small. Antennulæ narrow 



