452 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
Genus Auris Spix, 1827 
Subgenus Eudolichotis Pilsbry, 1896 
Auris (Eudolichetis) glabra (Gmelin) 
Voluta glabra Gmelin, Systema naturae, ed. 13, vol. 1, p. 3436, 1790. 
Auris (Eudolichotis) glabra Pilsbry, Manual of conchology, ser. 2, vol. 10, p. 113, 
1893. 
Type locality: Tobago Island. 
The species is well represented in the collections of the U.S. National 
Museum and the Museum of Comparative Zoology by many lots from 
the islands of Tobago, Trinidad, and Grenada. Between glabra and 
aurisciurt (Guppy) there are close relationships, and these two as well 
as the farm grenadensis (Guppy), occur in Trinidad, the last very 
probably also in the Guianas. Some specimens of aurisciuri from 
Margarita Island, have the same size and thickness and are very 
similar to glabra grenadensis. The color is very variable, with inter- 
gradation among the three forms. Even if glabra, aurisciuri, and 
grenadensis are predominant in Tobago, Trinidad, and Grenada, 
respectively, introduction and hybridization may be common. 
Auris (Eudolichotis) dillwyniana spectrum (Albers) 
Bulimus spectrum Albers, Malakozool. Blatt., vol. 1, p. 219, 1854. 
Auris (E.) midas spectrum Pilsbry, Manual of conchology, ser. 2, vol. 10, p. 119, 
1896. 
Type locality: ‘New Granada” (Colombia). 
Some authors placed spectrum as a variety of midas. Pilsbry said 
he did not see dillwyniana, ‘which is similar in form and coloring.” 
Based on a comparison of specimens as well as descriptions, my opin- 
ion is that spectrum is a subspecies of dillwyniana. The two species 
have the same type locality. 
Subfamily Odontostominae 
Genus Odontostemus Beck, 1837 
Odontostomus fasciatus tenuisculptus, new subspecies 
PuiaTE 1, Ficurss 1, 2 
Differs from typical fasciatus by its very fine sculpture, more 
diaphanous and thinner shell, and reddish color under the cuticle. 
There is a noticeable difference between the color of the cuticle and 
that of the naked shell; the periostracum may be cinnamon colored or 
