142 BUCCINID A. 
Lirorusus, Conr. 
Distr.—L. thoracicus, Conr. — ducussatus, Lea (1i,56). Eocene; 
Alabama. 
Genus not characterized. 
STREPSIDURA, Swainson. 
Distr.—S. costata, Swainson — Fusus ficulneus, Lam. (li, 57). 
Widely fusiform ; basal portion of the pillar turned outwardly, 
with a sharp fold at the base of the aperture; shell costate and 
subcarinate, body-whorl ventricose. 
Tortirusus, Conrad. 
Syn.—Meganema, Conr. 
Distr.— T. curvirostra, Cony. (li, 60). Miocene; N. Carolina. 
Differs from Busycon in being without a trace of tubercles or 
spines, and in having prominent regular ribs; the whorls are 
flattened on top, and slightly canaliculated. 
Pyropsis, Conrad. 
Distr.—P. perlata, Conr. (li, 61). Cretaceous; Tippah Co., 
Miss. 
Spire very short, apex not papillated; labrum without stricz 
within, thick; columella without a fold. 
Ciavirusus, Conrad. 
Distr.—C. Cooperi, Conrad (li, 62). Hocene; Alabama. 
The genus has not been characterized. 
SuspramMity PIS ANIINA. 
PisaniA, Bivona. 
Syn.—Pusio, Gray. 
Distr.—20 sp. West Indies, Mediterranean, Red Sea, Philip- 
pines, Australia, Polynesia. P. puso, Linn. (1, 22). 
Shell oblong; spire prominent, whorls smooth or spirally 
striated ; canal very short; outer lip thickened and crenated. 
Operculum ovate, nucleus apical. 
Between typical specimens of this genus and of Euthria “there 
is a distinction with a difference,” and therefore it may be profit- 
able to retain both groups; but there are species in which the 
characters become so merged that their generic classification is 
merely arbitrary. 
Eurureia, Gray. 
Syn.—Evarne, H. and A. Adams. 
Distr—10 sp. Mediterranean, Cape, N. Zealand, Cape Horn, 
Chili, California, Alaska, Japan. . cornea, Linn. (1, 23). 
Shell fusiform, smooth; aperture oval, produced anteriorly 
