270 PROCEEDINGS OF THE ACADEMY OF [1893. 



Collected on the Little Missouri, by MM. Krause. (Orig. descr., 

 translated). 



I have seen no authentic examples of this species. But there are 

 four fresh specimens of a form from Logan Canyon, Utah, collected 

 by Mr. Henry Hemphill, in the collection of the Academy labelled 

 "H. pulchella var. costata Mull.," certainly not costata, but which I 

 take to be V. gracilicosta, as they rather conform to the description. 



The spire is quite low, but distinctly conic. The ribs of the shell 

 itself are rather regular, about 40 on the last whorl, without mem- 

 branous appendages. Such are not worn off, since there is no trace 

 of them to be seen at the suture or umbilical part. Nucleus with 

 indistinct microscopic revolving lines. The last whorl is slightly 

 flattened above and below the periphery, thus being somewhat 

 angular at the periphery and base, in its last J slightly but dis- 

 tinctly ascending before it descends in front, somewhat more at the 

 suture. Aperture of the form given in the above description, 

 appearing slightly triangular. Diam. 2 - 6 mm. 



A corresponding lot of four specimens from the same place and 

 the same collector is in the National Museum Collection. 



Near the preceding we have to range some fossil forms. In 

 the southern part of New Mexico, near Eddy, in a dry " Salt Lake," 

 some fine quartz sand with numerous minute fossil, or semi-fossil 

 shells, was collected by a party of the Texas Geological Survey. 

 The shells were picked out and kindly forwarded to me for exami- 

 nation by Mr. J. A. Singley. There were about fourteen land and 

 fresh water species, extremely fragile and bleached. Among them 

 was a number of Vallonia which I then named costata var., but 

 they differ from that species in the more elevated spire, the last 

 whorl markedly ascending, and the surface rather densely and 

 somewhat irregularly striate, quite unlike costata. Whether they 

 had membranous ribs when fresh, it is, of course, impossible to tell, 

 but, from analogy with recent forms, it is probable that they had. 



Two specimens, much like those from Eddy, were found among a 

 number of minute land and fresh water shells in the same con- 

 dition and with the same white quartz sand seen by Mr. W. F. 

 Cummins, of the Texas Geological Survey, in Osborn's Julia Can- 

 yon, N. W. Texas, near the top of the bluff. 



Both these finds are said to be quaternary, and it is believed 

 that the species are not represented in the recent fauna of that part 

 of the country. As a whole they suggest parts of a more northern 

 fauna. A list of them will be published in another article. 



