37 



713 = TRACHYTRITON, Meek. Type Fusua ? vinculum, Hall & 

 Meek, Mem. Am. Acad. Arts and Sci. V, new ser. '6'J, ni,5, u,b. 

 Shell subfusiform or bucciuiform, rather thin ; canal moder- 

 ate, nearly straight ; columella smooth ; outer lip sharp except- 

 ing at intervals, when it becomes thickened and crenate within. 

 Surface without distinct varices, roughened or cancellated by 

 small, regular, revolving bands, crossing small, equidistant 

 longitudinal costse. 



Seems to be nearly related to the recent Triton cancellatum, 

 Lamk., and T. oregonensis, Redfield, usually referred to Artjo- 

 buccinum or Lafjena, Klein ; though they appear sufficiently dis- 

 tinct from Klein's types, even if his genera could be regarded 

 as regularly established. 



721 = Pleurotomaria texana, Suumakd, Proc. Boat. Soc. Nat. Hist. 

 Sept. 1S61, 197. 



723 = PIESTOCHILUS, Meek. Type Fusus Scarboroughi, Meek 



& Hayden, Proc. Acad. Nat. Sci. Phila. May 1857, p. 139. 



Differs from the typical species of ClaveUitkes in having the 

 aperture acutely angular behind (in consequence of the outer 

 lip being closely appressed to the body whorl above), instead 

 of forming a kind of posterior canal ; and in having the inner 

 lip thin instead of thickened above. 



Includes the Eocene Cluvella vickshurgoisis, Conrad, Jour. 

 Acad. Nat. Sci. sec. ser. II, pi. i, fig. 5. As Swainson neither 

 figured, described, nor referred to any known species in pub- 

 lishing his name ClaveUa, it cannot be retained. 



724 = Fusus Vaughani, Meek & Haydex, Proc. Acad. Nat. Sci. May 



1857, 139. 



This is not a true Caniharis, as has been determined since 

 the List was in type. It may remain undrfr that name, how- 

 ever, until its affinities can be determined from the examina- 

 tion of better specimens. 



726 = Fusus ? flexicostatus, Meek & Hayden, ib. 1856, 66. 



727 = Fusus ? Haleanus, D'Orbigny-, Prodrome de Pal. II, 1850, 228. 



728 = Neptunea impressa, Gabb, Jour. Acad. IV, new ser. 389, Ixviii, 5. 



729 = Fusus intertextus, Meek & Hayden, Proc. Acad. Nat. Sci. Phila. 



May 1.-57, 139. 



730 = Fusus Newberryi, Meek & Hayden, Proc. Acad. Nat. Sci. May 



1857, 66. 



I have long suspected that this shell, and others from the 

 Upper Missouri, are not generlcally distinct from Pyrifusus; but 

 was left in doubt because that genus was described as having 

 a broad, thick, flattened columella. On sending a specimen of 

 this species to Mr. Conrad for comparison, he writes that he 

 now thinks the columella of his typical specimen was flattened 

 by pressure, and that our shell probably belongs to the same 



