342 University of California Publications in Zoology | Vou. 14 
with a somewhat chalky substratum easily corroded. The upper whorl or two 
have lost most of this layer in the specimen figured and the nuclets is lost. 
The suture is deep, but not channeled. The canal has no constriction behind it. 
The aperture is rather long, the outer lip but slightly reflexed and a little 
fluted by the spiral sculpture. Inside there are a few faint and obscure lirae. 
The throat is pure white; the body callus, tinged with pale pinkish brown. 
The anterior angle of the aperture is nearly canaliculate, and produces a 
perceptible siphonal fasciole. The pillar is straight and strong, with two 
plaits; the posterior stronger, both oblique and rather low. The angular edge 
of the pillar, though not-elevated, might by some be taken as an obscure third 
plait. At the end of the plaits on the callus of the pillar are a number of small 
shelly pustules like those on C. cassidiformis.’’ 
Height, 27 to 35 mm. 
Occurrence.—At station D 5789 (14). 
This is near the known northern range of this gastropod. It was 
obtained by the Survey at a single station near the Farallon Islands. 
The depth at that station was 46 fathoms, and the bottom was de- 
seribed as being composed of fine dark green sand. 
Range.—Drake’s Bay to San Diego, California (Dall). 
PLEUTOTOMIDAE 
Turris Bolten 
Turris incisa Carpenter 
Plate 41, figures 2a and 2b 
Drillia incisa Carpenter (1863), p. 657; (1865a), p. 62; Arnold, R. (1903), 
p- 205. ; 
Description.—This species has been described by Tryon (1865) as follows: 
““Shell in general form like the preceding species (7. inermis), but smaller, 
the whorls somewhat more rounded; cinereous, with reddish chestnut revolving 
lines.’’ 
Height, 25 mm. 
Occurrence—At station D 5791 (1), and questionably at D 5835. 
This species has not before been recorded from the vicinity of San 
Francisco. The single determinable specimen in the Survey collections 
was dredged in 29 fathoms in the open ocean near the Farallon Islands. 
Range—Strait of Juan de Fuca, Washington, to Santa Cruz, 
California (Cooper). 
Turris perversa (Gabb) 
Plate 41, figures 3a and 3b 
Pleurotoma (Sureula) perversa Gabb (1865), p. 185; Gabb (1869), p. 6, 
pl. 1, fig. 10. 
Turris perversa, Dall (1909), p. 26, pl. 5, fig. 5. 
Description—This species was originally described by Gabb (1865) as 
follows: 
