ON THE CONCORDANCE OF MOLLUSCA. 



553 



and Porcupine Expeditions, will show the distribution of many species of 

 such deep-water Mollusca on each side of the North Atlantic, and more 

 will follow. To give some idea of the concordance in this distribution, 

 I will here give a comparative list of 35 nearly all deep-sea species which 

 Professor Verrill most obligingly sent me in September 1882, with my 

 remarks. 



Euro- 

 pean 



Names of species 



Remarks 



B. 



E. 



E. 

 E. 



E. 



E. 



E. 



E. 



E. 

 E. 



E. 



E. 



E. 



E. 



E. 



E. 



E. 



E. 



E. 



E. 



E. 



E. 

 E. 



Pecten vitreus (Gmcl.), Wood. No. 1029 ; 



458 fms. 

 Amussium fenestratum (F), Jeffreys. 



No. 949 ; 100 fms. 



Limaeasubovata, Jeffreys. No. 997 ; 335 fms. 

 Leda unca, Gould. No. 871 ; 115 fms. 



Area pectunculoides ; var. septentrionalis, 



Sars. No. 958 ; 310 fms. 

 Limopsis minuta (Phil.). No. 895 ; 238 



fms. 

 Cryptodon obesus, V. No. 918; 45 fms. 



Cryptodon ferruginosum, Forbes. No. 947; 



312 fms. 

 Loripes lens, V. & S. No. 873 ; 100 fms. 

 Astarte crenata, Gray, (A. lens. St. var.) 



No. 898 ; 300 fms. 

 Poromya granulata (Nyst) F. & H. No. 



949 ; 100 fms. 

 Lyonsiella abyssicola, Sars. No. 947; 



312 fms. 

 Neaera glacialis, G. O. Sars. No. 894 ; 



365 fms. 

 Neaera glacialis, G. O. Sars. No. 998; 



302 fms. 

 Neaera multicostata, V. & S. No. 1038 ; 



146 fms. 

 Neasra rostrata (Spengler), Loven. No. 



949; 100 fms. 

 Dentalium occidentale, Stimps. (= D. 



abyssorum, Sars). No. 1025 ; 216 fms. 

 Dentalium (slender variety). No. 892; 



487 fms. 

 Cadulus Pandionis, V. & S. No. 876; 



120 fms. 

 Lepetella tubicola, V. & S. No. 894 ; 



365 fms. 

 Margarita regalis, V. & S. No. 892; 



487 fms. 

 Calliostoma Bairdii, V. & S. No. 867; 



64 fms. 



Cingula Jan-Mayeni (Friele). No. 894 ; 

 365 fms. 



Scalaria Dalliana, V. & S. No 949 • 



100 fms. 

 Turbonilla Rathbunii, V. &. S. No. 995 ; 



358 fms. 



Pecten vitreus, Chemnitz. 



Amussium fenestratum, Forbes. 

 Sculpture of American speci- 

 mens finer and closer. 



Lima subovata, Jeffreys. 



Ledafragilis.Cherun. Larger than 

 European specimens. 



Area pectunculoides, Scacchi ; 

 var. septentrionalis. 



Limopsis minuta, Philippi. 



Axinus ftexuosus, Montagu, var. 

 polygona = C. biplicatus (after- 

 wards sinuatus), Philippi. 



Axinus ferruginosus, Forbes. 



Loripes lacteus, Linne. 

 Astarte crenata, Graj T . 



Poromya granulata, Nyst k Wes- 



tendorff. 

 Tecchiolia abyssicola, M. Sars. 



Neaera obesa, Loven ; var. 



Neaera obesa, Lov. ; var. 



Neaera striata, Jeffr. 



Neaera rostrata, Spengler. 



D.striolatum, Stimps. ; a strongly 



marked variety. 

 Young of last species. 



Cadulus Olivi, Scacchi. 



Also Norwegian and Western 



coasts of Africa. 

 Trochus Ottoi, Philippi. 



Allied to Trochus zizyphinus, L., 

 but unknown to me as Euro- 

 pean. 



Rissoa Jan-Mayeni, Fr., Spitz- 

 bergen, Jan Mayen I., and 

 Greenland. Sculpture variable. 



Scalaria clathratula, Turton. 



Apparently a large form of 

 Odostomia rufa, Ph. 



