70 TJniversity of MicMgan 



Shell (fig. xiii-I) : somewhat smaller than fossor. Ground 

 color: buff to salmon; the reddish tints predominate; spiral 

 bands absent or present, usually with the blotches of the 

 broken bands united to form varices parallel to the growth 

 lines; eroded apex and apical plug buff and light orange to 

 (usually) dark plum-color. Whorls: about 3I/2 retained. 

 Sculpture of last whorl: growth-ribs closely spaced, and 

 heavier than in fossor, but scarcely surmounting the spiral 

 sculpture which is weaker than in fossor ; intersections seldom 

 developed into cusps. Umbilicus : like arubana. Peristome : 

 columellar expansion weaker than in ivestpuntensis. Other 

 characters as in westpuntensis. 



Measurements 

 Shell Aperture Operculum Whorls 



alt. maj.diam. min.diam. alt. diam. long wide 

 male 



(type) 12.5 57(7.1) 48(6.0) 44(5.5) 89(4.9) 32(4.0) 78(3.1) 6(all) 

 female 14.4 58(8.3) 49(7.1) 45(6.5) 89(5.8) 33(4.8) 77(3.7) 3% 



A4ab. Quite infrequent; more common on top than at the base of the 

 escarpment (102 specimens collected). Type lot (see Table VII). 



A5. Infrequent ; under limestone slabs near the edge of the shore cliffs 

 (45 specimens). Slightly smaller. 



A6. Rare (10 specimens). Although dead shells are frequent through- 

 out the plantations of aloes, living specimens are very rare. 



A7a. Rare (2 specimens). Bleached and stained. 



A7b. Quite rare (12 specimens). Bleached, and stained with a rusty 

 deposit; very close to westpuntensis from C19. 



A7c. Very rare; 1 dead, bleached specimen. 



A3. Frequent; at the base of the escarpments (57 specimens). Simi- 

 lar to those from A4b; but somewhat approaches aruhana. 



AMNICOLIDAE 



Potamopyrgus parvulus (Guilding) 



Paludina parvula Guilding (1828; Zool. Jour., Ill, pp. 537-8; Suppl. 

 PI. xxviii, figs. 1-3). Paludina jamaiccnsis C. B. Adams (1849; Cont. 

 Conch. 42). Paludcstrina crystallina Smith (1898; Proc. Mal. Soc, III, 

 113); first Bonaire record; collected by Hartert. 



Type locality : St. Vincent, Lesser Antilles. 



