72 GASTROCOPTA, NORTH AMERICA, WEST INDIES. 



p. 91, pi. 4, f . 19 ; pi. 15, f . 10. VON MARTENS, Biologia Cen- 

 tral!- Americana, p. 328, in part; and of many other authors. 

 -Vertigo pellucidus Pfr., ARANGO, Fauna Malacologica Cu- 

 bana, p. 103, in part. ? Pupa bermudensis PRIME, The Ber- 

 muda Almanac for 1852. JONES, The Naturalist in Bermuda, 

 1859, p. 107 (name only). 



"At first sight this species would be referred either to P. 

 rupicola or P. procera. But a closer examination shows that 

 while it has the pale brown lip of the latter, it is a shorter 

 and much more ventricose shell; and while the number and 

 arrangement of the teeth are as in rupicola, the latter has a 

 much more slender form, the aperture is more oblique and 

 less elongated, the apex is obtuse, and the lip is white" 

 (Gould). 



This species differs from G. procera and G. rupicola by the 

 absence of an internal thickening of the lip, which is well 

 expanded but thin. There is no external crest. The columel- 

 lar lamella is simple, without a callous or tubercle below it. 

 The angulo-parietal lamella is not forked in front, but there 

 is a very low and inconspicuous projection on the columellar 

 side, marking the anterior end of the parietal portion. 



One of the commonest Antillean species. It was well de- 

 scribed by Gould, but subsequently was for a long time merged 

 into the group of forms known collectively as Pupa pellucida. 

 Dr. Pfeiffer seems to have initiated this lumping, in which he 

 was followed by Biuney and many other authors. It is cer- 

 tainly related to pellucida, but differs by being constantly 

 larger and generally of darker color. The shortest individuals 

 of procera are broader than the largest G. pellucida. G. rupi- 

 cola and its subspecies differ by the thick lip and spurred 

 angulo-parietal lamella, but immature shells are much alike. 



The typical form of servilis has a tapering shell of about 

 51/2 whorls, the summit very obtuse. There is no crest behind 

 the outer lip, but the whorl is flattened over the lower palatal 

 plica. The peristome is thin and brown, its margins rather 

 remote. The angulo-parietal lamella shows a small lobe on 

 the right side, in front view, caused by the slight outward 

 flare of the inner end of the angular. The front end of the 



