1890.] NATURAL SCIENCES OF PHILADELPHIA. 31 



ON NEW FORMS OF VEKTIGO. 

 BY DR. V. STERKI. 



It was to be expected that a more exhaustive research for small 

 PupidcB, and a closer examination of materials already in the dif- 

 ferent collections, by one observer, would bring to light quite a num- 

 ber not only of new species but of new varieties and local forms. 

 There, are now six, or possibly seven new Vertigo, a part of them 

 having been in my collection for more than three or four years, 

 Availing for confirmation. Two represented by only two examples 

 each — one of them from N. E. Ohio, the other from Illinois — are 

 omitted here, although I am satisfied they are good species. 



The four to be i:)ublished here are established beyond a doubt, 

 owing to the kindness of quite a number of conchologists, who fur- 

 nished me specimens and sent me their whole collections of Pupidae 

 for examination. In place of minute systematic descriptions, which 

 will follow elsewhere, I prefer here pointing out their main charac- 

 ters and comparing them with species already known. 

 Vertigo callosa, sp. nov. 



There are in collections two diflferent species under the name of V. 

 gouldii Binn. Their size and coloration is nearly the same, at least 

 in most variations, as are also the apertural lamellte as to number 

 and position. Yet they are decidedly and constantly distinct, espec- 

 ially by the formation of the outer wall at the aperture. Judg- 

 ing from the descriptions and more especially from the figures, the 

 true V. gouldii is characterized as follows : the last whorl is 

 somewhat predominating, thus rendering the whole shell more ovate 

 or conic ovate ; the palatal wall near the aperture is decidedly fiat- 

 tened, or impressed, the impression comprising also the crest and 

 being especially well marked at the " auricle" (as I name the 

 more or less projecting part about the middle of the outer margin, 

 to have a concise expression), forming a roundish groove outside and 

 a decidedly projecting angle inside, thus producing the " two curves 

 meeting in the center of the peristome." A feature, not striking but 

 only seen by careful examination, is the position of the short tooth- 

 like lamella at the base, somewhat nearer the margin than the end 

 of the columella, the base perceptibly widened at that place ; the 

 said lamella is probably an equivalent of the inferior columellar 



