Mr. J. Gwyn Jeftrcys on Xorwcf/iau MoKituCH. 441 



C. 4(Vr,() f. ; P. 30-40 f. C h-ceiiland (^Mollcr) ; Snitzbcrgcu 

 (Toivll). 



*.A[uNTA(iT.v Tr.MihLLA, JellV. B. ('. V. 177, 1)1. 100. f. 5. C, 

 4( )-G0 f. 



Kellia sunoRBicuLAins, Mont. B. C. il. 22o, and v. 17!», 

 pi. 32. f. 2. C. 10-60 f. ; P. 10-164 f. 



Axixrs FLEXUCsi'S, Mont. B. C. ii. 247, and v. 179, pi. o3, 

 f. 1. ('. 10-280 f., and var. Sarsil] P. 3-557 f. 



A. CROLiNEXsis, Jetir. B. C. ii. 250, and v. 180, pi. 33. 

 f. 2. C. 40-230 f. ; P. 90-1 47(J f. 



A. EUMYAHius, Sai-H. C. 40-230 f. 



A. FERRUUixosus, Forb. B. C. ii. 251, and v. ISO, pi. 33. f. 3. 

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



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

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



C. FA8CIATUM, 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. 



I80CARDIA con, 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 young, 

 which proves that the latter is the KelUa aTiysaicola of 

 Forbes, Venus miliaris of Philippi, and KclUella ahyssicola 

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

 are now before lue. The fry swarm in myriads on 

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

 themselves in the mud beyond the reach of a light dredge, 

 such as is generally used in the Xorwegian fiords ; but the}' 

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

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

 the fine bristly e])idermis Avhich clothes it at a later period. 

 The remarks of Prof. Sars on the differences oljservable in 

 the animal and shell of Isccardia cor and his KeUieUa 

 ohi/ssicola are perfectly correct ; but such differences result 

 from altered conditions of growth. Some of Forbes's 

 jEgean specimens named by him Kellia ahyssicola belong 

 to Axinns femtfjinosus, and others to the present species ; 

 his description will suit either. 



Cyprixa Iseaxdica, L. B. C. ii. 304, and v. 182, pi. 36. f. 2. 

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



A-'^TARTE sri-CATA, Da Costa. B. 0. ii. 311, and v. 183, pi. 37. 

 f. 1. C. 20-120 f.; P. 1.3-420 f. 



A. C0MrKE!<SA, Mont, B. C, ii- 3J,5, ami v. 183, jd. 37. f. 3. 

 C. 40-100 f. : P. 40 f. 



