Page:New land mollusks from Madagascar and Mexico.djvu/11

Rh found them different enough from its subspecies jaliscoensis and this to warrant its description as a novelty. According to Dr. Solem, the species hertleini differs from the matermontana group by being larger (13.2 mm. against 9.5-12 mm.), being always shouldered at the periphery, showing stronger ribs, having a wider umbilicus (one-third of diameter against one-fifth), having 6¾ whorls against 5¾, and almost entirely lacking the inner branch of the V-shaped lamella on the parietal wall.