Nyt Magazin 

 FOR NATURVIDENSKABERNE 



XXIII Binds 3die Hefte. 



Preliminary Report on Mollusca 



from the Norwegian North Atlantic Expedition in 1876 



by 

 Herman Friele. 



Montaciita (?) Vöringi n. sp. Fig. 1 & l a . 

 Form oval, rather convex; umbones projecting and swollen; 

 hinge proportionally large, teeth prominent; margins slightly 

 truncated at posterior end, otherwise regularly formed; colour 

 white, but a thick brown crust covers the shell, structure 

 consists of more or less distinct lines of growth. 



Size: L 3,7™* B 2,6 m. m. 



Hab: Station 1, 630 fathoms (Sognefjorden). This novelty to 

 the fauna was brought up by the first dredge on board the 

 „Vøringen"*), and I was therefore desirous of finding a name for 

 the new species connecting it with our vessel. 



In outer appearance it resembles most M. bidentata, but 

 the hinge differs essentially from all the Montacuta, so I am 

 rather doubtful whether it properly can be referred to this genera 

 We only succeeded in finding a left valve. 



Astarte acusticostata Jeff. 



Form rhomboidical, almost square; margin of anterior side 

 slightly rounded, in front almost straight or only slightly curved, 

 posterior edge truncate, dorsal line straight; umbones prominent 

 and recurved; lunula elongated heart- shaped; structure consists of 

 22 to 28 strong regular rib3; inner margins smooth; scars faint. 



*) The name of the exploring steamer. 



N. Mag. f. Naturv. XXIII. 3. 



