38 University of Michigan 



Poteria glaucostoma aulari, new subspecies 

 Figs. v-K, L, M. 



Six adults and 12 immature specimens from the edge of 

 the Cerritos de Yumarito, near Quebrada Seca, Estado Yara- 

 cuy, Venezuela (H, II, be, 28; type locality), and 4 adults 

 and 3 young from small colony in heavy forest, 2 kilometers 

 south of Palma Sola (H, II. be, 20). 



Shell : large, but thin. Color : above, dark olive-brown with 

 chestnut tinge; below, olive-green, the line of demarcation 

 either distinct or obscure; apex, fulvous amber; inside of aper- 

 ture bluish-purple by reflected light, although no color is visi- 

 ble by transmitted light. Whorls : 4^ to 4^ ; flatter and with 

 sutures less deeply impressed than in P. straminea. Sculpture : 

 weak, but with both series of oblique striae equally prominent; 

 although, in patches on the apical side, one set may dominate 

 over the other, while, on the umbilical side, they cross each 

 other so as to produce a malleate appearance. Aperture : oval ; 

 peristome simply and slightly thickened. Umbilicus : a little 

 more than ^4 the major diameter. Operculum: exterior, flat 

 to slightly convex ; interior with central boss less prominent 

 than in P. straminea. 



The form from Palma Sola (fig. v-M) is considerably more 

 elevated, shows more prominent corrugations, and is lighter in 

 color than the typical form (figs. v-K, L). The apex is light 

 amber, while the later whorls are brownish-amber above and 

 amber below. The bluish iridescence inside of the aperture is 

 considerably lighter. 



PVom I'feiffer's original description, and Reeve's figure 

 (1865, Conch. Icon., vii-35b), which agrees in all particulars 

 and a])])arently rei)resents the type, P. fj. (jloucostoiiia is a very 



