Page:American Seashells (1954).djvu/299

Rh often fimbriated axially between the cords, Siphonal canal moderately long, usually sealed over. Littoral to several fathoms. Common. There are 2 named varieties of doubtful biological significance: atropurpurea Cpr. and clathrata Dall.

Figure 49. Dwarf Tritons of the Pacific coast, a, Ocenebra inter jossa Cpr.; b, O. circmntexta Stearns; c and d, O. hirida Alidd. All natural size.

Ocenebra lurida Middendorff Alaska to Catahna Island, California. Lurid Dwarf Triton Figure 49c, d I to I % inches in length; 5 to 6 whorls; moderately elongate spire whose whorls show the axial ribs more prominently than the numerous fine spiral threads. Suture well-impressed. Body whorl with 8 to 10 rounded ribs which are strongest and shouldered just below the suture but which fade out below the periphery of the whorl. The smaller, smooth, spiral cords are elevated and prominent, often with numerous tiny axial lamellae between them. 6 to 8 small teeth on the inside of the outer lip. Color variable, whitish to rusty- brown, sometimes banded. Periostracum dark-brown and fuzzy. Siphonal canal usually sealed over. Very common from northern California north. Littoral to 30 fathoms. Ocenebra gracilli?7ta Stearns Graceful Dwarf Triton Plate 24m Monterey, California, to the Gulf of California. Ys inch in length, similar to lurida in shape; with 5 whorls, those in the spire weakly cancellate with the axial ribs the strongest. Last whorl without