Turris annulata: Shell fusiform with an acuminate, orthoconoid spire; spire angle 20-25°; b/1 0.23-0.29, a/1 0.41-0.45; base of last whorl somewhat constricted, siphonal canal slightly bent to right, longer than rest of aperture, narrow in young examples, in old individuals broad with a strong fasciole and deep false umbilicus; suture fairly shallow but sharply incised. Anal sinus relatively shallow, linguiform, margins with a slight flange. Early whorls with three spiral cords, increasing to a total of 4 main cords on later whorls. Subsutural cord low and rounded, bearing an angular median ridge and a more or less weaker thread on either side. Sulcus a deep, narrow furrow, slightly recessed under sinus cord complex, edged anteriorly by an angular thread. Sinus cord at periphery, slightly projecting (sometimes beyond peripheral cord), weakly flat-topped with sloping sides, the posterior side slightly tabulate. Base of later spire whorls with two close-set spiral cords with sloping sides, whose edges each bear a thin spiral thread, upper cord nearly as strong as sinus cord, the intervals containing a few fine to strong spiral threads. Upper base of last whorl with three angular spiral cords, followed by weaker but uneven ridges, and groups of intermediary threads, those on rostrum alternately weaker and stronger. Collabral threads coarse but not pliculate, somewhat cancellating the finer threads. Protoconch unknown. Reddish-brown with main cords and rostrum paler; periostracum dull medium brown, smooth, covering cords when fresh. Attains 96.4 mm in length.

Turris annulata: Turris annulata appears to vary somewhat in proportions. The more typical Thai population appears to comprise markedly narrower individuals than that represented by the holotype of P. fagina; in this the area between the suture and the shoulder varies from flat to distinctly concave. A sample from Phuket (ANSP 286281) at first sight appeared to be somewhat intermediate between T. annulata and T kathiewayae. However closer examination showed that bleaching and wear had produced a kathiewayae-like appearance, and sculptural details are those of T. annulata.

Turris annulata: Gulf of Oman and west coast of India to west coast of Thailand and Indonesia, in 10-84 m.

Turris annulata: Subsequent authors have synonymised Turris fagina with Turris annulata, and the dorsal view of Reeve's figure of the latter does appear to agree with that of the holotype of T fagina. Possible confusion has been caused by Powell's suggestion that the missing type of T annulata is "almost certainly" an unlocalised shell in the MacAndrew collection in NMWC (1955.158.00902). But there is no documented link between it and the Stainforth collection (where the holotype was held); furthermore, it shows a paler sinus cord than illustrated in Reeve's figure, and has a last whorl that is not strongly concave below the suture; furthermore it bears an operculum, rarely preserved in Reeve's era.