...strongly incurved ; nmbonal slopes very prominent, angular, and directed obliquely forward to the angular anterior basal extremity. Surface ornamented with...posterior extremity to the produced antero-basal angle, 0-70 inch ; height from the latter to the beaks, 050 inch ; length from the beaks to the posterior...

...strongly incurved ; umbonal slopes very prominent, angular, and directed obliquely forward to the angular anterior basal extremity. Surface ornamented with...smaller intermediate rib ; entire surface also marked by line very regular radiating and concentric striae, so as to produce a iuiat minutely cancellated sculpturing,...

...incurved ; umbonal slopes тегу prominent, angular, and directed obliquely forward to the angular anterior basal extremity. Surface ornamented with...sharply elevated, threadlike, subcrenate radiating rite, narrower than the depressions between ; each of these depressions on the posterior and flattened...

...strongly incurved ; umbonal slopes very prominent, angular, and directed obliquely forward to the angular anterior basal extremity. Surface ornamented with...Length from the posterior extremity to the produced an tero basal angle, 0.70 inch; bight from the latter to the beaks, 0.50 inch ; length from the beaks...

...strongly incurved; umboual slopes very prominent, angular, and directed obliquely forward to the angular anterior basal extremity. Surface ornamented with...Length from the posterior extremity to the produced antero basal angle, 0.70 inch ; hight from the latter to the beaks, 0.50 inch; length from the beaks...