Description
Body blackish brown to reddish gray, somewhat lighter on the sides, with numerous small, irregular, black spots scattered over surface, some joining in oblique reticulation along mucus grooves of flanks. Mantle of same ground color as rest of body. Foot fringe tan to gray, vertically striped with black. Sole uniform, white to light tan, unmarked or with two longitudinal rows of black spots defining lateral zones. Internal shell a low-arched plate with off-center terminal nucleus; periostracal margins extending beyond calcified part of shell. Caudal mucus pore prominent. Penis cylindrical, with blunt summit, constricted at base. Penial retractor muscle broad, strap-shaped, inserted at summit of penis. Verge broadly conical, much smaller than cavity of penis. Vas deferens long, slender, convuluted near middle of its length. Epiphallus entering summit of penis, of uniform diameter, throughout. Atrium containing three massive pilasters, with either appendix present at base, broad below and tapering to vermiform tip, or else broad sac on right side, containing multiple, tusk-shaped calcareous darts. Free oviduct as long as or moderately longer than vagina (Roth, 2004).