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. 



1. Peeten sulcatus, j\I tiller. 



2. Amussium hosAynsi, Forbes. 



Both widely distributed iu the North Atlantic and Mediterranean. 



Station 3. 



1 . Anomia patelliformis, Linne. 



2. Peeten pusio, L. 



3. Aporrha'is serresianus, Michaud. 



4. Fusus norveffieus, Spengler. 



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



Station 4, Cold area. 



1. Morvillia undata, Brown. 



2. Buccinum hydrophanumy Hancock. 

 Both Arctic species. 



Station 8. Cold area. 



1. Leda frigida, Torell. 



2. Leda tenuis, Phihppi. 



3. Leda subreqiiilatera, 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. 



11. Mohnia jnohni , Friele. 



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

 Norske Nordhavs-Exped. 1882. 



12. Pleurotoma (Bela) scalaro'ides, G. O. Sars. 



13. Plewotoma scalaro'ides, G. O. Sars ; var. = Beta 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 peetuncul aides, Scacchi ; var. septentriojialis. 



2. Natica affinis, Gm. 



3. Pilidium radiatum, M. Sars. 



4. Fusus sabini, Gray. 



