Description. Small, apex relatively large, posterior to center. Septum thin, extending straight across and lacking props. Ribs beaded and varying in number, strength, and prominence of the beading; rib interspaces finely punctate. Outline variable, nearly circular to elongate-oval. Length 2.0-3.5 mm.

Type Locality and Type Specimens. Middle Pleistocene, Lomita Marl, San Pedro, California. Holotype: S. S. Berry Collection no. 11998. Puncturella ralphi: Same locality; holotype: Berry no. 11999; paratypes: SBMNH 34530. Holotypes for both taxa are missing; they have not been located in Berry material atSBMNH or CAS. Material Examined. There are no specimens represented in the voucher collection from the Santa Maria Basin, but the species is common offshore to the north and south. Other material: 37 lots in the LACM collection.

Distribution. Cordell Bank, off Point Reyes, Marin County, California (38°N), to Cortes Bank, California (32°N) and Isla Guadalupe, Baja California (29°N). There is a single record from the Gulf of California: 55 m at Isla Carmen (26°N) (SDNHM). Habitat. On rocky bottoms in 20-100 m, particularly at the offshore banks and islands where it may be collected by divers.
Remarks. This species and its synonym were described originally from the Pleistocene of southern California, but has subsequently been found living. Puncturella ralphi was based on specimens with more numerous ribs, but such specimens are well within the range of variation observed in Recent specimens.