210 



OW THE TOPOGKAPIIY AN^D GEOLOGY 



to Metula. The inner lip of the only known species is thickened and is crossed by a 

 number of prominences, intermediate in character between teeth and transverse folds. 

 At the same time they are not like the one fold of Borsonia or the two or three of 

 CorcUera, which in those genera are very similar to those of Mitra. A better com- 

 parison would be with the teeth of Cypnea. 



G. dentifera. Gabb, n. s. 



Shell rovmded, fusiform ; spire elevated, nearly as long as the month ; whorls eleven, rounded on the sides, 

 slightly excavated near the suture, which is bordered by a little thickening of the succeeding whorl. Body whorl 

 convex, gracefully concave, and prolonged in advance into a straight canal. Surface cancellated by nearly equal 

 longitudinal and revolving ribs. On the upper whorls the former are proportionally larger, giving the spire a 

 slightly nodose appearance. Aperture narrow, rather suddenly constricted in advance. Canal moderate in length ; 

 inner and outer lips equally dentate ; outer lip very much thickened by a prominent rib, margin acute ; sinus deep, 

 narrow, and near the suture. Length 1.35 inch, width .5 inch. 



CORDIERA. Kouault. . 



C. magnifica. Gabb, n. s. 



Shell large, elongate, fusiform ; spire a little longer than the month, turriculated ; wliorls thirteen, straight on 

 the sides, concave and sloping above ; body whorl slender, sides sinuous, angulated above. Surface ornamented by 

 moderately large revolving ribs, somewhat alternate in size ; these are smaller above the angle, while below it they 

 are broken or crossed by undulations following the direction of the lines of growth, so as to present a distinctly 

 cancellated appearance. Suture bordered by a small rib. Aperture long and narrow, narrowed but not constricted 

 in advance. Inner lip not thickened, bearing four mitvaform folds ; outer lip simple, broadly convex in the middle, 

 retreating above ; sinus broad, shallow, placed above the angle ; canal twisted. Length 2.9 inches, width .6 inch. 



Very rare. The sculpture and general form of this species approach T. consors, 

 Sby., but it is a larger, thinner and more graceful shell, the cancellation of the sur- 

 face is more marked than I have ever observed in a series of over 150 specimens of 

 that species and tiie folds on the columella show that the resemblance is only one of 

 imitation and not of relationship. 



C. varicosa. Sby.' sp. 



This shell has the characteristic notch of the family distinctly developed, 

 coincident with the angle of the whorL _ 



BORSONIA. Bellardi. 



A genus established for a shell from the Miocene of Turin, is represented in our 

 collection by a beautiful little shell with the characteristic fold on the middle of the 

 columella. 



B. r e c u r V ir o s t r i s. Gabb, n. s. 



Shell small, fusiform ; spire turriculated, as long, or atritle longer than the mouth ; whorls nine, two nuclear, the 

 others angulated, excavated above, suture bordered by a rib. Surface ornamented by a series of tubercles on the 

 angle (about a dozen to the body whorl) ; below this there are large revolving ribs. Inner lip with a single large 

 nearly transverse fold ; outer lip simple ; sinus broad, oblique and close to the suture ; canal produced, strongly re- 

 curved. Length about .4 inch, width about .15 inch. . • 



