74 University of Michigan 



approach Clessin's description and figure. P. circuniUneatus 

 Clessin is apparently a sjoionym, but Sowerby's figure, 

 although he also quotes Shuttleworth MSS., looks like a 

 Planorbula. Specimens from St. Thomas (A. N. S. P., 123885) 

 approach the Curacao shells in size, color and texture. In 

 P. weinlandi Pfr. (1876; Mai. BL, XXIII, p. 172, fig. ii-9, 10, 

 11), from a brook near Jeremie, Haiti (A. N. S. P., 91455, one 

 specimen from "Weinland), the aperture encloses less of the 

 penultimate whorl than in typical pallidus, but this character 

 is verj' variable in the Curagao shells. P. meridaensis Preston 

 (1907; Ann. Mag. Nat. Hist., XX, pp. 493, 497, fig. 18), from 

 Merida, Venezuela, is a heavier shell with more swollen 

 whorls, and with the umbilicus more deeply sunken and show- 

 ing better impressed sutures (A. X. S. P., 98195 ; three 

 cotypes). This last form is slightly larger than P. kulmianus 

 {-\- kilhnerianus) ''Dunker" Clessin {op. cit., 108, fig. xi-12), 

 from Surinam, but otherwise appears to satisfy the description 

 and figure. All of these planorbes have sinistral shells, if the 

 visibility of the first whorls is taken as the criterion of the 

 apex. Otherwise, they appear to fall into the section 

 Gyraulus, although the epidermis is not hispid. 



PUPILLIDAE*^^ 



Gastrocopta longurio (Crosse) 



Fupa longurio Crosse (1872; J. de C, XX, 158); Crosse and Bland 

 (1873; J. de C, XXI, fig. 1-2). 



Type locality: "Curasao," probably the Schaarlo (C5c), 

 back of Willemstad. 



Distribution : Curasao, Aruba, Bonaire, Klein-Bonaire ; 

 almost everj'where under limestone rocks; apparently with 

 preference for the more arid situations (Cl-6, 10-13, 15, 17, 

 18; A2-5, 8; Bl-5, 8; Kl). 



Numerous specimens of Gastrocopta and Pupoides were col- 

 lected, and have been submitted to Dr. H. A, Pilsbry for study. 



4iaSee Addenda page 116. 



