Occasional Papers of the Museum of Zoology 75 



The relationships and variation of the present species, and the 

 identification of the next, will be discussed by him in a 

 future paper. 



Pupoides sp? 



Pupa fallax Gibbons (1879; J. of C, II, 131); first Curasao record, 

 Pupoides simona H. B. Baker (1923; tMs series, no. 137, p. 5). 



Distribution in the islands : Curasao, Aruba, Bonaire, Klein- 

 Bonaire ; with the preceding but not as abundant nor in quite 

 as arid situations (C3-6, 12, 17 ; A3-5, 8 ; B2, 4, 8 ; Kl) . This 

 species is probably not limited to the islands, although it is 

 omitted from the list in the discussion of zoogeographical 

 affinities. 



SUCCINEIDAE 



Succinea gyrata Gibbons 

 (1879 ; J. of Conch., II, 136, fig. 1-2) 



Type locality: "at St. Ann's, Curagao"; probably the 

 Schaarlo (C5c), back of Willemstad. 



Distribution: CuraQao (C5, 6, 11, 17; Cb6, 17); Bonaire 

 (B3; Bb5) ; Klein-Bonaire (Kl). Bare to quite infrequent; 

 under stones and the bark of dead trees, and in the crevices of 

 the bark of living ones ; abundance entirely independent of the 

 nature of the underlying rocks. Most of the living specimens 

 were juvenile or small, which leads me to believe that this 

 species only attains maturity during the wet season. 62 

 specimens collected. 



In what is here regarded as the type locality, the typical, 

 elongate form of this species integrades with more globose 

 specimens with relatively larger aperture, such as are repre- 

 sented by the measurements of those from Cll (see below). 

 The whorls are convex and the suture is deeply impressed, 

 almost channeled. The surface has a peculiar, satiny luster, 

 due to a microscopic sculpture of irregular, raised punctua- 

 tions. The growth wrinkles are prominent and, towards the 

 aperture, are often very pronounced, almost subcostate, and 



