44 NORMAN: ON THE MOLLUSCA OF BERGEN FIORDS. 



This little shell was abundant everywhere on the mud in 

 great depths, but I did not see a sign of Isocardia Cor. 

 Jeffreys is of opinion that it is the young of that species; but 

 even suppose it be that the "adults bury themselves in the 

 sand beyond the reach of a light dredge," surely we should 

 expect to find an occasional specimen of intermediate growth 

 in places where the supposed young swarm; yet out of the 

 thousands that passed under my eye in the various localities 

 noted in the table, I was unable to find one that exceeded 

 3 mill, in length. Moreover, M. Sars has pointed out 

 marked difference in the animals. Regarding therefore the 

 question whether these little shells are adult or not, as a 

 question at least still "sub judicibus," to avoid mistakes I 

 employ here Sars' name. 



71. Astarte crenata, Gray. 



Astarfe crenata, Gray. Supplem. Parry's First Voyage. 



Astaric crebricostata, Mci\.ndrew and Forbes. Ann. Nat. 

 Hist., xix., 1847, p. 96, pi ix., fig. 4. 



A single valve dredged at Station 24 to the N.E. of 

 Bukken. It is recent looking, more so than those valves 

 dredged by Mr. McAndrew among the Hebrides, which are 

 in my collection^ but like Yoldia arctica, which was found 

 with it, must be presumed to be fossil. Even as a fossil its 

 occurrence is interesting, inasmuch as it is not to be found 

 among the shells enumerated by M. Sars in his admirable 

 "Om de i norske forekommende fossile Derelevninger fra 

 Quartserperioden," 1865. 



72. Circe minima, (Mont.) 



One living specimen, south side of Kors Fiord. It is 

 extremely rare as a Norwegian mollusk; I believe that the 

 only previous instance of its occurrence was when M. Sars 

 dredged a single perfect specimen and a few valves near 

 Bergen, which are now in the Christiania Museum. I was 



J.C, ii., Feb., 1879 



