11 



ANCYLUS PARALLELUS, Hald. 



Plate 1. — Fig. 6. 



A. testa elongata, angusta, depress^,, diaphana, apice 

 subacute. 



SYNONYMS AND REFERENCES. 



^. PARALLELUS. This work; January, 1841. 

 " Adams. Hist, of Vermont. 



A. RivuLARis, Gould. Invert, of Mass., p. 224. 



DESCRIPTION. 



Shell pale, thin, and delicate; lengthened, 

 sides subrectilinear, diverging slightly forwards: 

 apex rather sharp, conspicuous, with two-fifths 

 of the shell posterior to it. 



Dimensions. Long. 0.25, lat. 0.15, elev. 0.08 

 inch. — Adams. 



Geographical Distribution. Inhabits New 

 England. 



OBSERVATIONS. 



In general appearance, resembles Velletia 

 lacustris, Miill., of Europe, but is at once 

 distinguishable by having the apex directed 



