1883.] THE ' Triton' expedition. 391 



Besides the above stations, the trawl was used off the Butt of Lewis 

 in 40 fathoms. 



List of Mollusca. 



Station 2. Warm area. 



L Pecten sulcatus, Miiller. 



2. Amussium hoskynsi, Forbes. 



Both widely distributed in the North Atlantic and Mediterranean. 



Station 3. 



1 . Anomia patelliformis, Linne. 



2. Pecten pusio, L. 



3. Aporrha'is serresianus, Michaud. 



4. Fusus norvegicus, Spengler. 



The third is a southern, and the fourth a northern form. 



Station 4, Cold area. 



1, MorvilUa undata, Brown. 



2. Buccinum hydrophanum, Hancock, 

 Both Arctic species. 



Station 8. Cold area. 



1. Leda frigida, Torell. 



2. Leda tenuis, Phihppi. 



3. Leda suhtBquilatera, Jeffreys. 



4. Necera subtorta, G. O. Sars. 



5. Natica affinis, Gmelin. 



6. Cerithiopsis costulata, Moller. 



7. Fusus islandicus, Chemnitz. 



8. Fusus sabini, Gray. 



9. Fusus delicatus, Jeffr., n. sp. 



10. Fusus berniciensis. King ; var. elegans. 

 Jl. Mohnia molmi , Friele. 



See Nyt Mag. 1877; Jahrb. mal. Ges. 1878 & 1879; and 

 Norske NordhaTS-Exped. 1882. 



12. Pleurotoma (Bela) sca/aro'ides, G. O. Sars. 



13. Pleurotoma scalaro'ides, G. O. Sars; var. ^ Bela scalaris, 

 G. O. Sars. Not Defrancia scalaris, Moller. 



14. Pleurotoma tenuicostata, M. Sars. 



From typical specimens of all these three species. 



Mostly northern. Nos. 1 and 2 are generally distributed in the 



North Atlantic and Mediterranean. No. 10 ranges southwards 



to the Bay of Biscay. 



Station 9. Cold area. 



1. Area pectunculdides, ^cSi.cc\ii; vax. septentrionalis. 



2. Natica affinis, Gm. 



3. Pilidium radiatum, M. Sars. 



4. Fusus sabini, Gray. 



