92 THE NAUTILUS. 



Callocardia morrhuana (Linsley). At 1 and 5. 



Venus mercenaries Linnaeus. Becoming less common. 



Venus mercenaries notata Say. True form very rare. 



Gemma gemma (Totten). Generally distributed. 



Gemma gemma purpurea (H. C. Lea). Different habitat 

 than preceding. 



Petricola pholadiformis Lamarck. Generally distributed. 



Tellina tenera Say. Fine specimens at 1. 



Tellina tenella (Verrill). One valve at 1. 



Tellina versicolor De Kay. Fine specimens at 5. 



Macoma balthica (Linnaeus). Commonest at 2. 



Tagelus gibbus (Spengler). At 5. 



Ensis directus (Conrad). Generally distributed. 



Siliqua costata (Say). Found only at 5. 



Spisula solidissima (Dilhvyn). Very abundant at 4. 



Spisula solidissima similis (Say). Occasional. 



Mulinia lateralis (Say). Generally distributed. 



Mya arenaria Linnaeus. Generally distributed. 



Corbula contracta Say. Found only at 5. 



Earned truncata (Say). At 1, 3 & 5, but especially common 

 at 3. 



Zirfaea cripata (Linnaeus). One valve at 5. 



Teredo navalis Linnaeus. At 5. 



Gasteropoda. 



Dentalium sp? Fragment at 5. 



Pyramidella fusca (C. B. Adams). Several specimens at 5. 



Pyramidella winkleyi Bartsch? Two or three specimens 

 which seem to be this species. 



Turbonilla nivea (Stimpson). Only at 5, where it is the 

 commonest Turbonilla. 



Turbonilla aequalis (Say). I have referred 7 of my speci- 

 mens to this species. 



Turbonilla vinea Bartsch. Two specimens from 5. 



Turbonilla areolata Verrill. One specimen, but with six 

 rather than five spiral rows of pits, from 5. 



Turbonilla interrupta (Totten). This is the typical form, 

 not as described by Bartsch, but as described by Bush. The 



