Tritonalia carmen, new species.
Angel de la Guardia Island, Gulf of California, 20 fathoms (1932). Type 11378, Lowe collection; paratype, San Diego Society of Natural History.
Shell solid turreted, of four angular whorls and three rounded nuclear and post-nuclear whorls, suture distinct, each whorl with sloping shoulders, the lower four prominently angular at the periphery. Below the periphery on the body whorl is a lesser spiral angulosity and a smaller spiral cord below that. Outer lip thin, inner lip covered with a white callous, canal short, moderately wide, and slightly bent to the left. Faint incremental lines are visible over the entire surface. Color of shell a light cream with a few light brown flecks on upper portion of each whorl. Diameter 5 mm., altitude 9 mm.
The paratype specimen was dredged off Carmen Island in 20 fathoms. Under catalogue number 96326, the U. S. National Museum has three examples of this species dredged in 9 fathoms off La Paz. They had been tentatively identified as young of Murex squamulatus Cpr.

The shell is small (maximum length 10 mm) and fusiform. The spire is high and acute, consisting of three convex nuclear whorls and four or five strongly shouldered postnuclear whorls. The suture is impressed. The body whorl is moderately large, fusoid, and strongly contracted below the periphery. The aperture is subovate, with a broad entrance into the open siphonal canal, and no perceptible anal sulcus. The outer apertural lip is non-erect and weakly, broadly crenulate; its inner surface bears eight moderately weak lirations, two in the shoulder region and six below it. The columellar lip is entirely adherent and smooth. The siphonal canal is moderately short and open, bent to the left, and dorsally recurved. The body whorl bears five erect, subspinose varices. Intervarical axial sculpture is lacking, except for weak growth lamellae. Spiral sculpture consists of major and minor cords: three strong major cords on the body diminish in prominence anteriorly, one at the shoulder margin, one medial, and one basal; a single minor cord, between the upper two majors, is visible only on the varix; and on the upper canal is a series of two or three minor cords. Shell color is white to waxy yellow-orange. In some specimens, intervarical blotches of brown are evident on the shoulder.

Central Gulf of California: Isla Angel de la Guarda to La Paz, and at Guaymas, Mexico.