278 



iille to add nine more from other authors, and ten new forms 

 mnv described, bringing the total to 22 species, with 4 varie- 

 ties. Two dextral shells are very interesting, as are also 

 tliree subulate species, all from comparatively deep water. 



Triphora dexia, n. sp. PI. xxii., tigs. 6 to 10. 



Shell dextral, elongate conical in the earlier half, cylin- 

 drical in the later; of 15 whorls, including the protoconch. 

 This has two and a half turns, its whorls short and swollen 

 convex, with axial costas, valid; 12 in the first whorl, 17 in 

 the second ; the apex is a tiny smooth hemisphere lying hori- 

 zontally. Spire-whorls not convex, suture distinct, impressed. 

 The body-whorl has three openings — one a bent tube formed 

 by the closure of the anterior canal ; the second a bent tube 

 formed by the closure of the posterior canal, and project- 

 ing just below the suture; the third by the aperture which 

 is complete, round, much produced into a wide tube, some- 

 what effuse at its opening, and with a slightly irregular 

 border. 



Sculpture . — In the upper whorls is a central prominent 

 round rather rugged spiral rib, a second smaller spiral lies 

 immediately below the suture, and a third is just visible 

 immediately above the suture. As the shell grows the lowest 

 rib gradually enlarges until in the last whorl it equals the 

 central rib. This rib, at first central, gradually moves lower 

 and approximates the third rib. Axial ribs, 16 in the penul- 

 timate, one-fourth the thickness of their interspaces and 

 •somewhat obliquely antecurrent, extend between the sutures, 

 validly tuberculating the central spiral and but slightly the 

 sutural ones. A scar runs from a slight notch near the 

 centre of the ventral border of the apertural opening to the 

 extremity of the anterior tube, and another from near the 

 centre of the dorsal border of the aperture to the end of the 

 posterior tube, indicating the lines along which union be- 

 tween the two sides of the aperture has been effected. The 

 base is flatly concave with the anterior tube projecting in 

 its centre, is radially engraved with curved lines, and is sur- 

 rounded by a nodular pad formed by the exaggerated lowest 

 spiral, which with its fellow then runs between the two closed 

 canals, and fades out on the dorsum of the apertural tube. 

 The upper spiral vanishes at the base of the posterior tube. 



Dim. — Length, 75 mm., including the anterior tube of 

 07 mm. : width, I'G mm., excluding the apertural tube of 

 0'6 mm. Diameter of apertural tube, 11 mm., including its 

 reflected expansion. 



Vanutions. — The adult mouth mav form in a shell with 



