MUSEUM OF COMPARATIVE ZOOLOGY. 195 



P. trilineata Pse. = P. nodosa Pfr., in a half-pint, were all banded and 

 possessed a pillar tooth, except three, which were entirely dark fuscous 

 with a narrow white sutural line ; the latter = P. nodosa Pfr. type. 

 P. vexUium Pse., in a small parcel, exhibited the dark and striated exam- 

 ples with or without bands {= P. alternata Pse.), exceeding in numbers 

 the horn-colored shell with narrow brown bands =^ P. stenostoma Pfr. 

 type. These two species of Mr. Pease seem to inosculate. I have re- 

 ceived from Mr. Garrett a few very dark examples of P. alternata Pse., 

 and he informs me that one in fifty examples of P. vexillum Pse. is 

 sinistral. 



P. citrina Pse. was present in a small lot. Mr. Pease was of the 

 opinion that this species wonld eventually prove to be a variety of 

 P. faba. In a recent letter from Mr. Garrett, he reiterates his opinion, 

 previously expressed, that P. citrina is a good species. In the collection 

 of Mr. Pease, kindly loaned for my inspection by the Museum of Com- 

 parative Zoology, a few examples were marked P. jjallida Pse. Mss. 

 These = elongated examples of P. faba, which latter is disposed to be 

 somewhat protean, of which P. citrina is probably another variety, or, 

 as Mr. Pease suggests, it may be a hybrid. 



P. aj'iproximata Pse., in a small lot, exhibited one banded to twenty- 

 live unicolored examples. My opinion in regard to this species is the 

 same as expi'essed in my Bibliographic Catalogue of the genus. 



P. imperforata Pse. 'Mss., in a pint lot, was very nniform in size and 

 color ; about half a dozen were banded. It is a larger, heavier, and 

 more inflated shell than P. virgitiea Pse. Mss., and the surface is more 

 roughened by oblique striee. This shell has been supposed to = 

 P. solidula Pse. Mss. (non Reeve). The type examples of P. solidula 

 Pse. Mss. in the Pease collection = banded specimens of P. a2)proximata 

 Pse. Mss. 



In one quart of P. protea Pse. the light and striated examples pre- 

 dominated in numbers over the dark and banded varieties. Well fed 

 and fully developed examples approximate P. faba in size and form. 

 The colors are often rusty red with a darker base, or uniformly rusty 

 red with a broad light zone at the. periphery. This last variety repre- 

 sents type examples from Mr. Garrett and the Mnseum Godeffroy. In 

 the Smithsonian collection this shell is labelled (probably by Carpenter) 

 P. faba Martyn var. The latter, however, is arboreal, while the former 

 is terrestrial. See P. fusca Pse. in my Bibliographic Catalogue. 



Of P. Ofaheifana Brug. there were abont two quarts ; nearly all the 

 examples were sinistral. The type or original unicolored variety was 



