Mr. J. Gwyii Jeffreys on Norwegian MoUusca. 441 



C. 40-GO f. ; P. 30-40 f. Greenland (Moller) ; Spitzbergeii 

 (Torell). 



*Montacuta"tumidula, Jeffr. B. C. v. 177, pi. 100. f. 5. C. 

 40-60 f. 



Kellta suborbiculaims, Mont. B. C. ii. 225, and v. 179, 

 pi. 32. f. 2. C. 10-()0 f. ; P. 10-164 f. 



AxiNUS FLEXUOSUS, Mout. B. C. ii. 247, and v. 179, pi. 33. 

 f. 1. C. 10-230 f., and var. Sarsii ; P. 3-557 f. 



A. CEOLINENSLS, JeftV. B. C. ii. 250, and v. 180, pi. 33, 

 f. 2. C. 40-230 f. ; P. 90-1476 f. 



A. EUMYAiiius, Sars. C. 40-230 f. 



A. FERRUGiNOSUS, Forl). B. C. ii. 251, and v. 180, pi. 33. f, 3. 

 C. 50-230 f. ; P. 40-557 f. 



Cardium ECiiiNATUJr, L. B. C. ii. 270, and v. 181, pi. 34. 

 f. 2. C. 10-80 f.; P. 15-114 f. 



C. FASCIATUM, Mont. B. C. ii. 281, and v. 181, pi. 35. f. 3. 

 C. 10-180 f. ; P. 30-75 f. 



C. EDULE, L. B. C. ii. 286, and v. 182, pi. 35. f. 5. C. 0-50 f., 

 in the latter case yonng and probably drifted ; P. 3 f. 



C. MINIMUM, Ph. B. C. ii. 292, and v. 182, pi. 35. f. 6. C. 

 10-100 f. ,• P. 15-542 f. 



IsoCAEDiA COR, L. B. C. ii. 298, and v. 182, pi. 36. f. 1. C. 

 20-230 f. ; P. 106-1380 f. I have a complete and con- 

 necting series, from the adult to the fry or very yoimg, 

 which proves that the latter is the Kelh'a aln/ssicola of 

 Forbes, Venus miliar is of Philippi, and KellieUa ahyssicola 

 of Sars. Typical specimens of all these so-called species 

 arc now before me. The fry swarm in myriads on 

 the surface of the mud in dee]) water. The adults bury 

 themselves in the mud beyon.d the reach of a light dredge, 

 such as is generally used in the Norwegian fiords ; but they 

 may be seen, in a fossil state, imbedded \\\ the brick-clay 

 near Christiania. In its earliest state the shell has none of 

 the line bristly epidermis which clothes it at a later period. 

 The remarks of Prof. Sars on the diiferences observable in 

 the animal and shell of Isocardia cor and his KeUieUa 

 ahyssicola are perfectly correct ; but such differences result 

 from altered conditions of growth. Some of Forbes's 

 j'Egean specimens named by him Kcllia ahyssicola belong 

 to A.rinus fermyinosusj and others to the present species ; 

 his description will suit eitlicr. 



Cyprina Iseandica, L. B. C. ii. 304, and v. 182, pi. 36. f. 2. 

 C. 15-60 f. ; P. 12-40 f. 



Astarte sulcata, Da Costa. B. C. ii. 311, and v. 183, pi. 37. 

 f. 1. C. 20-120 f.; P. 15-420 f. 



A. coMPRE.ssA, Mont. B. C. ii. 315, and v. 183, pi. 37. f. 3, 

 C. 40-100 f. ; V. 40 f. 



