30 THE NAUTILUS. 



color, fragile and thin, collected at Denver, Colorado. There 

 is a similar specimen in the Binney and Bland Collection. 



(11.) *S'. salleana Pfr. A specimen in the Binney and Bland Col- 

 lection, from Alexandria, La., is white, and allied to S. 

 elegans. 



(12.) S. tvilsoni Ijea.. Mr. Singley sent me this from Brevard Co., 

 Florida, and I make the following note: jo/et^m group ; 

 may be a good species ; amber color, rather shiny, more 

 obtuse and swollen than most pfeijferi. Agrees with Lea's 

 description, but spire shorter than in his figure. 



(13.) S. effusa Shutt. A specimen in the Binney and Bland Col- 

 lection is from Spring Garden Lake, Fla. A good species, 

 allied to pjeifferi. 



Sect. II. Neritostomce. 

 = Neritostovia (Klein) Morch. 



(14.) S. putris L. S. ohliqua is generally not to be distinguished in 

 anything from this. I found pub-is in 1887 close to the 

 Cave of the Winds, at Niagara Falls. There is also a speci- 

 men from Niagara in the Biuney and Bland Collection, 

 marked obliqua. Mr. Singley sent me specimens of ohliqua, 

 collected in Carleton Co., Ontario, Canada. They approach 

 S. virescens Jeffreys (non Morel.) rather than j)utris, the 

 color being pale greenish-horn. One form, Avhich may be 

 considered typical, was 16 mill, long, spire 5? mill, long, 

 texture like^^n^n's. The other, w'hich represented a variety, 

 was 15 mill, long, spire 3 J mill, long — a more globose shell, 

 which can probably not be separated from S. virescens Jeff., 

 of Europe. Say's var. ovalis is very near to this. 



(1 5.) S. totteniana Lea. I received this from Mr. Singley, collected 

 by Mr. E. W. Roper at Revere, Mass. It is, I think, a good 

 species — an extreme form allied to virescens. Shell yellow- 

 ish-green, inflated and thin, whorls rounded, mouth broad, 

 spire short. 



(16.) S. grosvenorii Lea. Specimens from Lee Co., Texas, were 

 kindly submitted to me by Mr. Singley. They comprised 

 two forms, one greenish and the other, which may be called 

 var. rxijescens, reddish and more globose. The species is a good 



