162 



103. Amphiascus parvus, G. 0. Sars, n. sp. 

 (PI. cm). 



Specific Characters. Female. Body moderately slender, sublinear in form, 

 with the anterior division not much broader than the posterior. Rostrum oi 

 moderate size and of the usual form. Caudal rarni very short, much broader 

 than they are long, middle apical setae slightly thickened at the base. Anterior 

 antennae somewhat less slender than in the preceding species, 4th joint only little 

 longer than 3rd, terminal part not attaining half the length of the proximal one. 

 Posterior antennae with the outer ramus shorter than the terminal joint of the 

 inner, its middle joint very small and without any seta. 1st pair of legs with 

 the outer ramus extending but little beyond the middle of the 1st joint of the 

 inner, its middle joint of about the same size as the 1st, and having no seta inside, 

 last joint somewhat smaller and armed with 3 strong spines and 2 geniculated 

 setae; 1st joint of inner ramus very slender, straight, being almost 4 times as 

 long as the other 2 combined, last joint not much longer than the 2nd, apical 

 claw of moderate length and almost straight. Natatory legs rather slender, ter- 

 minal joint of outer ramus in the 2nd and 3rd pairs with only a single seta 

 inside. Last pair of legs with the distal joint broadly ovate in form and car- 

 rying 6 marginal setae, the 2 apical ones very slender and quite smooth; inner 

 expansion of proximal joint comparatively short, triangular, not extending to the 

 middle of the distal joint. Ovisacs of moderate size, and containing a limited 

 number of rather large ova. 



Colour not yet ascertained. 



Length of adult female 0.46 mm. 



Remarks. This new species somewhat resembles in its general appear- 

 ance A. minutus, but is of much smaller size, and may moreover be distinguished 

 by the less slender anterior antennae and by the structure of the legs. 



Occurrence. Some few female specimens of this form were selected from 

 samples taken last summer off the south coast of Norway, at Ris0r and Lillesand. 



104. Amphiascus debilis (Giesbr.). 



Dactylopus debilis, Giesbrecht, Die freilebendeu Copepodeu der Kieler Fohrde, p. 122 (numerous 



figures). 



Syn: Dactylopus parvus, Scott. 



Specific Characters. Female. Body moderately slender, sublinear in form, 

 being almost of uniform width throughout. Rostrum rather prominent, conically 





