Pupa found in the United States. 357 



with the other two, and above this is a fifth inconspicuous 

 tooth. Lip sHghtly everted, not flattened, sometimes a Uttle 

 inflected at the right, umbilicus small. Length, -^^ breadth rj^ 

 inch. 



At first sight this species would be referred either to P. ru- 

 picola or P. jirocera. But a closer examination shows that 

 while it has the pale brown lip of the latter, it is a shorter and 

 much more ventricose shell ; and while the number and ar- 

 rangement of the teeth are as in rupicola, the latter has a 

 much more slender form, the aperture is more oblique and less 

 elongated, the apex is obtuse, and the lip is white. 



Notwithstanding the distinctions mentioned above, perhaps 

 most observers, on ordinary inspection, would maintain that 

 these three were merely local varieties of the same species. I 

 will add, therefore, that by means of an excellent microscope, 

 to which a camera lucida is attached, I have made accurate 

 figures three inches in length, which render the differences in 

 form unequivocal. 



Found at Santa Cruz by Dr. R. E. Griffiths, and near Ma- 

 tanzas by John Bartlett, Esq. 



I have inserted this species here, although it cannot strictly 

 be considered as belonging to the United States, because of 

 its proximity to the States, and more especially because it 

 helps to illustrate two of our species. 



PUPA FALLAX. 



Plate XVI. fig. 15. 



P. turrita, glabra, pallide castanea, umbilicata ; anfractibus sex convexis ; apertura 

 obliqua, subrolundalaj edenlula ; labro albo, valdc reflexo, slriato. 



" Cydostoma margiiutta. Shell turreted, pale horn color 

 or dusky, obsoletely wrinkled across ; suture rather deeply 

 impressed ; volutions six ; aperture suboval, truncate trans- 

 versely above by the penultimate whorl, nearly one third the 

 length of the shell ; labium nearly transverse, color of the ex- 

 terior part of the shell : labrum equally and widely reflected, 

 thick, white ; umbilicus distinct. Length J inch." (Say, 

 Journ. Acad. i^at. Sc. 11. 172.) 



