HI MMl'LTS. XXXV 



are parallel in the middle (pi. 57, fig. 62, B. d. mooreanus). The 

 radula (pi. 57, fig. 64, B. d. nworeanus), as in typical Bulimulus, the 

 lateral and marginal teeth being bicuspid, centrals with small or 

 subobsolete ectocones. 



Distribution, Central and Northern Mexico, Lower California, 

 and the Southwestern United States. 



Group of B. alternatus. N.-E. Mexico, Texas to Ky. 



B. durangoanus Mart., xi, 1*27. v. schiedeanus Pfr., xi, 131. 



B. dealbatus Say, xi, 128; xiv. niveus Hegewisch. 



152. candidissimus Nyst. 



liquabilis Rve. xanthostomus Wiegm. 



confinis Rve. v. patriarcha W. G. B. xi, 132. 



v. nigromontanus Dall, xi, B. alternatus Say, xi, 132; xiv, 



128. 152. 



v. ragsdalei Pils., xi, 129. lactarius Mke. 



v. pasonis Pils., 1902. v. marise Alb., xi, 133. 



v. mooreanus ' WGB.' Pfr. xi, binneyanus Pfr. 



1 30. galeottii Nyst. 



schiedeanus auct. albidus Taylor. 



Group of B. sufflatus. Lower California. 



B. sufflatus Gld., xi, 136. B. recognitus Mab., xi, 137. 



vBsicalis Gld. B. pilula W. G. B., xi, 138. 



juarezi Pfr. B. cooperi Dall, xi, 139. 



v. insularis Coop., xi, 137. B. decipiens Coop., xi, 139. 



v. chinchensis Coop., xi, 137. B. levis Dall, xi, 140. 



Group of B. montezuma. Lower Cal.; Sinaloa. 



B. excelsus Gld., xi, 141. B. acholus Mab., xi, 143. 



elatus Gld. B. cosmicus Mab., xi, 144. 



v. sinaloas Pils., xi, 142. B. montezuma Dall, xi, 144. 

 B. pallidior Sowb., xi, 142. proteus auct. Amer. 



vegetus Gld. B. baileyi Dall, xi, 145. 



v. striatulus Dall, xi, 143. B. gabbi C. & F., xi, 147. 

 vegexspiza Coop. 



