OF CONCHOLOGY. V 



long point, bearing a double spur on the outer side ; no lateral 

 branches or spurs above. Dorsal saddle rounded, entire ; supe- 

 rior lateral lobe simple above, bifurcate below, the branches 

 unequal, the upper bearing a large spur on the outer side. 

 Lateral saddle narrower than the dorsal and, like all the others, 

 simple and rounded. Inferior lateral lobe of the same general 

 pattern as the superior, but more slender, and the spur on the 

 upper side more strongly developed. Beyond this are one large 

 saddle and three small, spur-like lobes ; the first and second 

 placed obliquely to each other, the last, inside of the umbilical 

 angle, being on the same level with its next neighbor. 



TURBO. 



? T. REGIUS, Gabb.— PI. 5, fig. 4. 



Shell large, massive, low-turreted, height and width about 

 equal ; whorls "about six, flattened or slightly sloping on top, 

 sides flattened, base slightly convex. Surface ornamented by 

 large blunt tubercles on the upper angle, about ten to a volution, 

 and by smaller ones, nearly obsolete on the lower angle ; besides 

 these the whole surface is covered by minute, sliglitly elevated 

 revolving lines. Aperture subquadrate, inner lip slightly en- 

 crusted. 



Length and width of body whorl, each, 24 in.; length of aper- 

 ture I'O in. 



Locality/. — Volcano, Nevada, associated with Ammonites Neva- 

 danus. Found by Mr. Clayton. 



The single specimen, on which I describe this species, is in a 

 pretty fair state of preservation ; showing the form and surface 

 markings perfectly, but is somewhat broken about the outer side 

 of the mouth. Enough however remains to show that, if not a 

 true Turbo, it is as closely related to that genus as are any of 

 the so-called Turbos of the Jurassic formation. 



? T. ELEVATUS, Gabb.— PI. 3, fig. 5. 



Shell elongate, conical, spire elevated ; whorls six or seven, 

 sides converging, top slightly truncated and bearing numerous, 

 regular, small tubercles or nodes, about 20 to a volution, which 

 form a beaded rim, projecting a little laterally ; body whorl flat- 

 tened and converging on the sides, angulated below, base slightly 

 convex and with small nodes on the lower, as well as upper angle. 

 Aperture sub-elliptical, acute above. 



Length 1-5 in., width of body whorl '85 in., length of aper- 

 ture *65 in. 



Found by Mr. Clayton, with the preceding. 



