GENITAL DUCTS OF THE CERITHIACEA (GASTROPODA: MESOGASTROPODA) FROM THE GULF OF CALIFORNIA

In the Cerithiacea the pallial genital duct exhibits varyingdegrees of closure. In addition, two anatomical groupings occurwithin their genital systems. These groups are based on differencesin the location of the accessory sperm sacs, albumen gland andthe presence or absence of a distal sperm collecting groovein the female. Criteria in the male include the nature of (thevas deferens and the existence of spermatozeugmata. (Received 13 February 1984;