Shell small, conical, white, eight-whorled, beside a minute glassy nucleus of about two whorls; sculpture of, on the last whorl, one moderate spiral in front of the suture, three larger ones on the side of the whorl, the most anterior of which is covered by the suture as the whorls advance, a strong cord revolving on the base and entering the aperture midway between the pillar and outer lip, and a less prominent broad spiral between the last and the columella, which does not appear inside the peristome; these are crossed by, on the last whorl, about thirty strong narrow equal regularly-spaced cord-like riblets which are hardly nodulous at the intersections; the interstices are deep, and narrower spirally than they are axially; whorls moderately rounded and well marked; aperture rounded, waved externally by the sculpture, internally lirate; pillar concave, callous; a callus connecting it with the outer lip; base rounded, strongly sculptured, the aperture slightly varicose, but in older specimens than those before me probably markedly so. Max. Ion. of shell, 6.0; of last whorl, 3.0; max. lat. of shell, 2.5 mm.

Peristichia agria Dall, 1889
Distribution: North Carolina, Florida, Louisiana, Texas; Yucatan; Brazil. Size: 6 mm
Description: Color cream-yellow; shape elongate-turreted; sculpture of convex whorls with distinct, elevated, spiral and axial ribs, becoming knobby where they intersect; strongly cancellate with deeply excavated suture; small, heterostrophic, smooth nucleus; aperture subovate, crenulate on outer side of outer lip; lip somewhat flared toward base; columella with a spiral cord that penetrates inside the shell.
Habitat: Collected in dredge material offshore. Found at depths from 0 to 115 m
(380 ft).
Remarks: See Garcia (2000); Hyde (2000).

This very lovely latticed little shell is shorter and more Odostomia-like. The sculpture is a good deal like that of Mathilda rushii, but less crowded and less sharp. The specimens were all slightly less than adult, and the varicosity of the outer lip would doubtless have increased if they had continued to grow.

Off Cape Hatteras, in 63 fms., sand, at U. S. Fish Commission Station 2595, bottom temperature 75°. ; Florida, at Marco, No Name Key, and Key "West, on grassy bottom, between low water and two fathoms, H. Hemphill.