THE NAUTILUS. 



143 



Yoldia thraciceformis, Storer. 

 Several old broken valves and 

 an occasional young specimen. 



Anodonta cataracta, Say. 



XJnio complanatus, Say. 



Pecten magellanicus, Gmelin. 



Pecten islandicus, Miiller. Rare. 

 Single valves occasionally. 



Anomia simplex, d'Orbigny. 



Anomia aculeata, Miiller. 



Mytilus edulis, Linne. 



Modiolaria nigra, Gray. Rare. 

 Several broken specimens. 



Modiolaria discors, Linne\ 



Crenella glandula, Totten. 



Crenella decussata, Montagu. 

 Rare. Same locality as G. 

 glandula. 



Periploma fragilis, Totten. 



Thracia conradi, Couthouy. 

 Rare. 



Thracia myopsis, Moller. 



Pandora gouldiana, Dall. 



Lyonsia hyalina, Conrad. Com- 

 mon. Sandy mud, ten fathoms. 



Lyonsia arenosa, Moller. Ex- 

 tremely rare. Same localities 

 as L. hyalina. 



Cyclas islandica, Linne. 



Astarte undata, Gould. 



Astarte subaequilatera, Sowerby. 



Pisidium abditum, Hald. 



Sphcerium partumeium, Say. 



Venericardia novanglics, Morse. 

 Rare. 



Venericardia borealis, Conrad. 



Thyasira goxddii, Philippi. 



Cardium pinnulatum, Conrad. 



Cardium ciliatum, Fabriciua. 

 Rare. 



Callocardia murrhuana, Linsley. 

 Bare. 



Macuma balthica, Linne. 



Mticoma calcarea, Gmelin. 



Mya arenaria, Linn. 



Saxicuva arctica, Linn. 



Lymnaea humilis, Say. 



Lymnaea umbilicata, Adams. 



Lymnaea desidiosa, Say. 



Lymnaea columella, Say. 



8CAPHOPODA. 



Dentalium entails, Linne. Common in deep water, mini. 



Acmsea alvens, Conrad 



common on Zostera marina. 



Acmsea testudinalis, Miiller. Ra- 

 rer than alveus. 



Lepela cceca, Miiller. 



Puncturella noachina, Linn. 



Margarita helicina, Fabr. 



Margarita groenlandica, Gmelin. 

 Very rare. 



GA9TUOPODA. 



Very Natica clausa, Broderip & Sow- 

 erby. Rather rare. 



Lunatia heros, Say. 



Lunatia heros, var. triseriata. 

 Say. Very common. Found 

 both in deep and shallow water, 

 but never in company with 

 Lunatia heros. 



Velutina laevigata, Linn. 



