As Pleuroliria parthenia Berry, 1957

Shell small, slender, turreted, acutely cylindroconic; principal whorls convex, strongly and sharply keeled; major keel peripheral, appearing at an early stage, with a lesser but still strong subsutural keel above it, .and eventually 2 still lesser keels below it, while on the body-whorl a 5th persists into the aperture; of the last 3 the central keel is the strongest and is sutural; on the base appears a minor keel just under the entering keel, and another somewhat further down, the area between and below these covered by many low granular threads which fade away to-ward the tip; similar threads appear between the keels of the spire, together with a succession of occasionally obsolescent low axial riblets which are strongly retractive above the periphery and protractive below it. Aperture narrowly oval, terminating above in a strong subsutural sinus with a thickened edge produced by the topmost keel, and below in' the long, narrow, acutely tapering canal; anal sinus constricted but deep, coinciding with the major keel; columella long, narrowly calloused, nearly straight. Color a nearly uniform creamy-white, occasionally lightly tinted on1 the depressed areas with yellowish-brown. Alt. of holotype 30.4, max. diam. 8.5, alt. aperture 15.5 mm. Type Locality: Off Islas Tortugas, Gulf of Nicoya, Costa Rica; dredged in 1 fms. by Ted Dranga, 1952.

Comparisons: The lovely shell of this fine species is much like that of the more colorful P. oxytropis (Sby.), but it possesses good characters in the heavy superior carina, the more slit-like anal sulcus, and the weakened axial sculpture.