of the North Atlantic and of North-Western Europe. 635 



3. Asterope norvegica, G. 0. Sars. 



(PI. Lii., figs. 7-9.) 



1869. Asterope norvegica, . . Saes, Gt. O., " Undersogelsen over Christiania- 



fjordens Dybvandsfauna," p. 53, 



The following are the describer's characters of the species : — 

 Shell of female smooth, elongated ovate or elliptical ; greatest height sub-equal 

 to half the length ; ventral and dorsal margins equally convex ; obtusely rounded 

 at both extremities. Seen from above, narrowly ovate ; greatest width rather 

 behind the middle ; extremities obtuse. Antennal sinus situated nearly in the 

 middle of the anterior extremity, very narrow, inclining obliquely upwards. 

 Eyes distinct ; antennules very strongly built, composed of six articulations, the 

 first the longest, the second rather longer than the following, upper margin 

 with one densely ciliated seta which curves backwards ; thii'd and fourth imper- 

 fectly jointed with five setse on upper margin ; penultimate joint with a short 

 annulated sensory appendage furnished, at the extremity, with six olfactory 

 papillae ; last joint terminating in a strong unguis and six short setae. Antennae 

 of the usual form, natatory branch composed of nine articulations, the setae long ; 

 first joint scarcely longer than the length of the rest combined ; appendicular 

 branch very small, indistinctly three-jointed, vsdth one terminal seta. Mandibular 

 feet short and robust; basal joint (the mandible itself) large and thick, not 

 provided with any biting processes ; second joint with a short lobe on the inner side 

 armed with six **aculei"; distally above, with a small laminar appendage and 

 two ciliated setae ; penultimate joint short, scarcely twice as long as broad ; 

 upper margin beset with about six thick annulated setae ; last joint very small, 

 armed with a nearly straight unguis and four setae. . . . Vermiform appendage 

 with ten unequal spines. Caudal laminae very small, as broad as long, armed 

 with five ungues which rapidly increase in length towards the extremity, and 

 above the ungues two short setae. Colour white ; length 1-34 mm. 



Holmestrand, in the Christiania Fjord, Norway, in 50-60 fathoms, muddy 

 bottom (Gr. 0. Sars). Our figures are taken from specimens for which we are 

 indebted to Professor Sars. 



