112 THE NAUTILUS. 
Alectrion obsoleta was everywhere very abundant, the shell reach- 
ing a length of an inch, and occasionally having the surface 
largely eaten away. One was found with a prominent, biangu- 
late carina just above the center of the body whorl so that it 
appears immediately above the suture on the penultimate whorl, 
becoming obsolete half way around that whorl. The other 
shells found, not including the countless fragments, were: 
Macoma balthica (Linné) few, mostly young. 
Mya arenaria Linné few, mostly young, 
Odostomia impressa (Say) few. 
Odostomia trifida (Totten) fairly common. 
Odostomia bisturalis (Say) few. 
Crepidula fornicata Linné occasional. 
Paludestrina minuta (Totten) rare. 
Lacuna vincta fusca Gould one. 
The fossil shells include: 
Mya arenaria (Linné) few. 
Crepidula fornicata Linné few. 
Crepidula glauca convexa Say few. 
Crepidula plana Say rare. 
Bittium alternatum (Say) The only specimen found meas- 
ures 7.25 mm. in length by 2.5 mm. in width and has 
eight closely crowded spiral bands on each of the last two 
whorls. 
Alectrion obsoleta (Say) abundant. 
Alectrion trivittata (Say) few. 
Urosalpinx cinerea (Say) occasional. 
At the base of the sand-spit there is a small influx of sand 
where the waters of the bay have been cutting across during 
the last two or three years, and a new fauna is being introduced 
consisting of: 
Venus mercenaria Linné young. 
Gemma gemma purpurea (H. C. Lea) abundant. 
Mya arenaria (Linné) few. 
Ensis directus (Conrad) few. 
Crepidula fornicata Linné few. 
Alectrion obsoleta (Say) occasional. 
