NIAGARA FALLS AND VICINITY 



239 



NAME OF SPECIES 



Pelecypoda 



18 Sphaerium striatinum (Lam.) 



19 S. stamineum (Conrad) 



20 Pisidium virginicum Bourg. . 



21 F. compressum Prime . 



22 P. abditum Haldeman 



23 P. ultra-montanum Prime... 



24 P. scutellatum Sterki 



25 Lampsilis rectus (Lam.) 



26 L. ellipsiformis (Conrad) . .. 



27 Alasmidonta calceola (Lea) . 



28 A. truncata (Wright) , 



29 Unio gibbosus Barnes 



30 Quadrula solida (Lea) 



31 Q. coccinea (Conrad) 





a 





a Lime lake. 



b Chippewa creek. 



c Living, but not within a radius of 50 miles. 



Class GASTROPODA Cuvier 



Genus pleurocera Rafinesque. 1819 



Shell lengthened and conical, aperture moderately prolonged into 

 a short spout or canal in front. The columella is not thickened. 



Pleurocera subulare Lea (Fig. 161) (Philos. soc. Trans. 4:100) 

 Shell large and heavy, elevated and turreted, having an 

 acute apex; nine to 11 whorls, flat, shouldered at the su- 

 ture, which is impressed; body whorl surrounded by three 

 ridges, the middle being the most prominent; aperture 

 small, lip thin, folding back over the columella and cover- 

 ing the umbilical tract. 

 Locality. Goat island. 



Fig. 161 Pleu- 

 rocera subu- 



Genus goniobasis Lea. 1862 lare 



Shell heavy, elongated or ovate, aperture plain, slightly angulated 

 in front. 



G-oniobasis livescens (Menke) Tyron 1873 (Fig. 162). M e- 

 lania livescens Menke (1830. Syn. mcth. p. 135) 



