200 BULLETIN OF THE 



Vertigo approximans, Sterki. 



In 1887, Mr. A. A. Hinkley, of Dubois, 111., sent me, with otlier Pupidce, one 

 specimen of a Vertigo, probably new, and in 1889 anotlier of the same. The said 

 gentleman and Mr. William A. Marsh kindly forwarded me all their Pupidce for 

 examination, but so far I have found no other example, yet I am satisfied such will 

 be found. The form is related to Vertigo ovaia and Gouldii, hut different, and is 

 characterized by the two palatal lamella being close together, for which reason I 

 gave it the manuscript name V. approximans. 



Vertigo approximans, Sterki, The Nautilus, 1890, p. 136. 



The above is Sterki's description. 



Vertigo rugosula, Sterki. 



Related to V. ovata and Gouldii ; in shape more elongated than the latter, more 

 cylindrical, and somewhat larger. Apertural parts and lamellae much like those of 

 ovata; but the columella is decidedly longer and straighter, and the inferior colu- 

 mellar lamella is distinctly placed on it. Length 1.8-2.0, diameter 1.1 mm. Of a 

 peculiar formation is the surface. Of the five well-rounded whorls, about one and 

 a half of the upper are nearly smooth ; the following, with exception of 

 the last, are distinctively and regularly striated ; the last is very finely 

 but distinctly rugose in the sense of the lines of growth, near the aper- 

 ture again striated. Color, dark chestnut. 



This is a beautiful species, of which I saw the first example in the 

 collection of Mr. Bryant Walker, who had found it in April last at 

 Pass Christian, Mississippi. Last September, Mr. W. G. Mazyck col- 



_ , lected a number of them on Sullivan's Island, S. C. In either place 



V. rugosula. ' ^ 



they were in company of Pupa rupicola, Say. Quite lately I have seen 



one example from Lee County, Texas, sent by Mr. J. A. Singley ; it was a dead 

 shell, and not fully mature, but recognizable. The species consequently seems to 

 be widely distributed along the South Atlantic and Gulf coasts. Two specimens 

 were sent in by Mr. H. Hemphill, who collected them at Fish Camp, Fresno Co., Cal. 

 In Eastern Florida, Volusia County, etc., a form has been found to be quite com- 

 mon which I refer to this species, but as a distinct variety which may be called 

 ovulum. It is somewhat smaller, ovate ; the striation and rugosity of the surface 

 are less marked, and the inferior apertural lamella is wanting. In turn it has in 

 most examples a lamella at the base (between inferior columellar and inferior 

 palatal), and the callus in the palatal wall is rather strong. The coloration of part 

 of them is somewhat lighter. It cannot be confounded with V. ovata. Say, its rela- 

 tions to the type of rugosula being evident, and, in addition, ovata has been found 

 with it. Nor can it be referred to ventricosa. It is larger and stronger, of much 

 darker color, its surface is not so smooth and polished, it has three or even four 

 lamellas more, and the columella is longer. 



Vertigo rugulosa, Sterki, Proc. Acad. N. Sci. Phila., 1890, p. 34. 



The above is Sterki's description. The figure was drawn b}^ him. 



