GASTROCOPTA. 



207 



Vol. XXIV, page 65. G. procera duplicata Sterki, pre- 

 occupied, has been changed to G. p. sterkiana, vol. xxiv, p. 357. 

 The type locality is Glenrose, Somerwell Co., Texas, not 

 " Somerville " as printed in line 14 from bottom. 



Gastrocopta pellucida parvidens (Sterki), vol. xxiv, p. 

 80, was taken on Tortuga Island in the middle of the Gulf of 

 California by the California Academy Expedition of 1921, 

 according to G. Dallas Hanna, Proc. Cal. Acad. Sci. (4), xii, 

 1923, p. 515. 



Gastrocopta rixfordi Hanna. Text-fig. 9. 



"Shell minute, cylindric; whorls four, rounded; glossy- 

 transparent when alive; lines of growth very fine but evenly 

 spaced; last whorl with an expanded bulge just back of the 

 aperture; aperture semielliptical ; peristome broadly reflected 

 but not thickened with callus; ends continuous across the 

 body whorl ; apertural armature consisting of five or six teeth, 

 depending upon the degree of separation of the parietal (type 

 specimen has five) ; upper and lower palatal very deeply 



Fig. g.—G. rixfordi (after Hanna). 



seated, flat and blade-like, the latter being larger and deeper 

 placed; basal thin, quadrangular, the axis placed parallel to 

 the plane of the aperture, and the apex directly beneath the 

 apex of the parietal; columellar long, slender and high, the 

 interior termination invisible from the aperture ; parietal the 



