100 PLEURODONTE. 



ulated embryonal shell, the following whorls microscopically decus- 

 sated ; the last whorl rounded at periphery. Color yellowish-brown 

 with dark oblique streaks and sometimes a subperipheral girdle. 

 Aperture wider than high, the thick lip expanded ; columella short, 

 arcuate, with an obscure callus fold. Type P. luquillensis Shutt. 

 (See pi. 22, fig. 1, P. gigantea). 



Soft anatomy and jaw unknown. Radula (of P. luquillensis) as 

 in Parthena angulata, q. v. 



Distribution, Haiti and Porto Rico. 



P. gigantea Scop., v, 73. P. audebardi Pfr., v, 74. 



cornumilitare auct. not L. P. luquillensis Shutt., v, 74. 



Section Eurycratera (Beck) Gray. 



Eurycratera BECK, Index Moll., p. 45, in part. GRAY, P. Z. S. 

 1847, p. 171, type H. jamaicensis. Lejocheila or Leiocheila ALBERS, 

 Die Hel., p. 109, lS50.Liochila v. MART., Die Hel., p. 146, 1860, 

 type H. jamaicensis. 



Shell imperforate, globose, solid, the surface finely wrinkled, 

 embryonal whorls H, large, shining, not granulated. Whorls 4, 

 the last very large, rounded, having few color bands. Aperture very 

 large, oval, the outer lip expanded, columella long, arcuate ; parietal 

 and columellar callus spreading upon the base. Type P. jamaicensis 

 Gmel., pi. 22, fig. 6. 



Jaw thick, arcuate, attenuated toward the ends, the anterior sur- 

 face sculptured with 14 decided but unequal ribs, irregularly dis- 

 posed, and denticulating either margin. Lingual membrane with 

 41.1.41 teeth. Side cusps and cutting points wanting on central and 

 inner lateral teeth, but represented by an expansion of the reflexed 

 sides of the mesocones. The single species is confined to Jamaica. 



Beck selected no type for Eurycratera, and his list of speciesincludes 

 forms belonging to many diverse groups. Gray, in 1847 selected 

 H. j amaicemis as type of the group, and I do not see how we can 

 avoid following his selection ; especially in view of the fact that v. 

 Martens, in 1860, selects as type H. dominicensis, a species not 

 included by Beck in his list, and therefore certainly not the type of 

 his group. 



