EUGLANDINA. 175 



Genus EUGLANDINA Crosse et Fischer. 



Euglandina C. & F., Mission scientifique >au Mexique et 

 dans 1'Amerique Centrale, Mollusques, i, 1870, p. 97; first 

 species Glandina lignaria. FISCHER, Manuel de Conchyl., p. 

 452 ; type G. lignaria. Glandina STREBEL, Beitrag zur Kennt- 

 niss der Fauna Mexikanischer land- und susswasser-Conchy- 

 lien, ii Theil, 1875, pp. 4-58. v. MARTENS, Biologia Centrali 

 Americana, Mollusca, pp. 46-80. Pfaffia BEHN, Amtlicher 

 Bericht iiber die 22 Versammlung deutschen Naturforscher 

 und Aerzte in Bremen, Sept. 1844, 2te Abth., p. 131 (1845), 

 no type. 



The shell is usually of large or moderate size, oblong, fusi- 

 form or ovate, typically with striate or decussate surface and 

 without distinct varices; but in some forms the surface is 

 smooth, and sometimes varices are present. Columella ab- 

 ruptly truncate at the base; outer lip unexpanded, simply 

 arched forward or straight. Whorls 6 to 9. 



Type E. aurata var. lignaria Rve. Distribution, American 

 mainland, from Brazil to Texas, Florida and South Carolina. 



Euglandina differs generically from Oleacina and Poiretia 

 by characters of the genitalia. See Introduction to this 

 volume. 



The name Glandina, commonly used for this group, was 

 based solely upon G. voluta, the type of the prior genera 

 Polyphemus Montfort and Oleacina Bolten. It is therefore 

 inapplicable to the Mexican and other mainland species, if, 

 as I believe, these differ generically from Antillean groups. 

 Pfaffia was proposed for an undetermined Mexican snail said 

 to be related to Polyphemus glans Say; but no adequate 

 generic characters are given, and it would be impossible to 

 determine its type. 



The Mexican and Central American Euglandinas present 

 problems of great difficulty, the species being very similar 

 and at the same time variable. The shape and sculpture of 

 the embryonic whorls are among the most important charac- 

 ters, but these are unknown in many species. The critical 

 studies of Strebel form the basis for a really scientific knowl- 



