THE NAUTILUS. 



143 



Yoldia ihraciceformis, Storer. 

 Several old broken valves and 

 an occasional young specimen. 



Anodonta cataracta, Say. 



Unio complanalus, 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 glandu/a, Totten. 



Crenella decussata, Montagu. 

 Rare. Same locality as G. 

 glandula. 



Periploma fragilis, Totten. 



Thracia conradi, Couthouy. 

 Rare. 



Thracia myopsis, M oiler. 



Pandora gouldiana, Dall. 



Lyonsia hyalinn. Conrad. Com- 

 mon. Sandy mud, ten fathoms. 



Lyonsia arenosa, Moller. TCx- 



tremely rare. Same localities 



as L. hyalina. 

 Cyclas islandica, Lin no*. 

 Asfarte undata, Gould. 

 Astarte sttbaequilatera, Sowerby. 

 Pisidiuin abditum, Hald. 

 Sphcerium partumeium, Say. 

 Venericardia novangl/'ce, Morse. 



Rare. 



Venericardia borealis, Conrad. 

 Thyasira gouldii, Philippi. 

 Cardium pinnulatum, Conrad. 

 Carditim ciliatum, Fabricius. 



Rare. 

 Callocardia morrhuana, Linsley. 



Rare. 



Macoma balthica^ Linne. 

 Macom'i calcarea, Gmelin. 

 My a arenaria, Linn. 

 Saxicava arctica, Linn. 

 Lymnsea humilis, Say. 

 Lymnnea, umbilicata, Adams. 

 Lymnaza de.sidiosa, Say. 

 Lymnsea columella, Say. 



SCAPHOPODA. 



Dentulium entalis, Linne. Common in deep water, mud. 



GAST1{(JPODA. 



Acmsea alveus, Conrad. Very 

 common on Zostera marina. 



Acmsea testudinalis, Miiller. Ra- 

 rer than alveus. 



Lepeta cesca, Miiller. 



Puncturella noachina, Linn. 



Margarita helicina, Fabr. 



Margarita groenlandica, Gmelin. 

 Very rare. 



Nation c/ausa, Broderip & Sow- 

 erby. Rather rare. 



Lunatla heros, Say. 



Lunatia heros, var. triseriata, 

 Say. Very common. Found 

 both in deep and shallow water, 

 but never in company with 

 Lunatia heros. 

 Vehttina Isevigata, Linn. 



