Stanton.] STROMBID^E. 147 



greatly thickened and bordered externally by a raised rim; the ante- 

 rior canal is bent inward (from the observer in the dorsal view) ; and in 

 the known forms there is no transverse sculpture on the volutions of 

 the spire. In fact, it agrees with Pugnellus in every particular except- 

 ing that it has a long posterior canal. 



In ZittePs Handbuch der Paleontologie, Lispodesthes is adopted as 

 a subgenus under Aporrhais, but he includes in it Aporrhais reussi 

 and other related forms of the type of Aporrhais (Perissoptera f) pro- 

 labiatciy above described, which, as it seems to me, is, entirely distinct. 

 Holzapfel, 1 following Zittel, has used the name only for such forms as I 

 now refer to Perissoptera. In outline there is some resemblance be- 

 tween species of Perissoptera and Lispodesthes nuptialis, but the differ- 

 ences in all other characters seem to me of much greater than specific 

 importance. 



I would place Lispodesthes in the Strombida3 next to Pugnellus. 



Lispodesthes nuptialis White. 



PL xxxi, Figs. 5 and 6. 



Anchura nuptialis White, 1874 ; Expl. Sur. West 100th Meridian, Prelim. Rept. Invert. 



Foss., p. 24. 

 Lispodesthes nuptialis White, 1876, U. S. Geog. & Geol. Snr. West 100th Meridian, vol. 



iv, p. 192, PL 18, Figs, da and b. 

 Lispodesthes lingulifera White, 1876, ibid., PI. 18, Figs. 2a and 6. 



Eevised description : 



" Shell small; body sub fusiform; wing . moderately large; spire 

 somewhat prominent, acute, but so thickly encrusted with callus that 

 the volutions are only obscurely shown, except where the callus is re- 

 moved by exfoliation; revolving angle absent or obsolete upon the 

 volutions of the spire, even when bared by exfoliation of the callus, 

 but it is somewhat distinct upon the body- volution, being continued 

 out upon the falciform process of the wing. This posterior falciform 

 process diverges widely from the axis of the shell, but by recurving it 

 extends nearly as far backward as the apex of the spire; anterior proc- 

 ess of the wing somewhat thickened, its breadth throughout about 

 equal to that of the falciform process at the base, its length and breadth 

 about equal, its outer end obliquely rounded ; space between the two 

 processes very narrow; from the base of the anterior process the bor- 

 der of the wing extends forward with a concave curve to the base of, 

 and ends at, the long, slender anterior canal; posterior border of the 

 wing concave and continuous with that of the falciform process on the 

 one hand and with the callus-border of the posterior canal on the 

 other. 



" Length, from the apex of the spire to the end of the anterior canal, 

 20 mm ; breadth, measuring across from the base of the processes of the 



iMollusken der Aachener Kreide, p. 120, PI. XII, Figs. 11-13. 



