17 



oped, which are stout, hyaline, about one third as long as the 

 foot. See Rep. on the Invertebrata of Mass., 191, fig. 122. 



P. CONTRACTA. The aperture, in Vol. III. fig. 22, should 

 be placed much farther to the right. It is probably common 

 in all the States, as I have received specimens from the Island 

 of Cuba. Found about rotten stumps or under stones in 

 moist pastures. See Invertebrata of Mass. 186, fig. 117, and 

 ADAMS, in Thompson's Hist, of Vermont. 



P. MILIUM. The teeth on the outer lip are more properly 

 folds, as indicated by the two elongated indentations on the 

 exterior of the shell corresponding to them. I have a speci- 

 men from Mr. Anthony which he received from Louisiana. 

 See GOULD, Invertebrata of Mass. 187, fig. 118. ADAMS, in 

 Silliman's Journ. Vol. XL. 270, and Thompson's Hist, of Ver- 

 mont. 



P. PROCERA. Both the description and figure of this species 

 are so incorrect that 1 reproduce an accurate figure, (fig. 12.) 

 Its peculiar characters have been noticed under P. rupicola. It 

 has not yet been sent me from any other locality than the 

 vicinity of Baltimore. 



On the cover of the Society's Journal, Vol. IV. No. 1, I 

 indicated a species by the name of P. carindta which I sup- 

 posed to be new. But the examination of another specimen 

 has satisfied me that it was merely an immature or a fractured 

 specimen of P. procera. 



P. ARMIFERA. Professor Adams has found this species 

 plentifully at Crown Point, and some other places near Lake 

 Champlain. I have also received it from Maryland. See 

 also ADAMS, Catalogue of Mollusca in Thompson's Hist, of 

 Vermont. 



P. SIMPLEX. Very few of these shells have as yet been 

 found, and none, that I know of, in any other except the 

 original locality. They are enough, however, to establish the 

 validity of the species. 



P. PLACIDA, Say, proves to be a specimen of Bulimus 

 obscurus, Mull. (B. hordeaceus, Brug.) 

 3 



