1911.] NATURAL SCIENCES OF PHILADELPHIA. 349 



over folds and intervals. On the last whorl there are 8 or 9 short, 

 high folds, narrower than the intervals, and somewhat pointed at the 

 shoulder, and sharp spiral cords, the concave intervals of which bear 

 several unequal spiral threads. There are 16 or 17 major spirals between 

 the suture and the basal point of the outer lip, and 5 or 6 more small 

 ones on the convex basal fasciole. The whole surface between the 

 spirals is marked with fine growth striae. The last whorl is deeply 

 concave below, expanded around the umbilicus, which is deep and 

 funnel-shaped. Aperture as in the type of the genus, except that there 

 is no posterior channel, merely an angle. Outer lip deeply sulcatc 

 within, with crenulate edge. Columella nearly straight. Parietal 

 callus thin, with raised edge and one or two small lirse near the pos- 

 terior angle of the aperture. 



Length 41, diam. 25 mm. 



This fine species bears the name of Dr. William H. Dall, whose 

 "Tertiary Mollusks of Florida" is the greatest classic of the American 

 Neocene. 



It is evidently close to the recent S. anomala (Reeve), the type of 

 Solenosteira, but differs by the greater number of spiral cords and the 

 absence of an expansion or incipient channel at the posterior angle of 

 the aperture. We know S. anomala only by Reeve's too brief account. 

 It is probably a species of the Panamic region. S. pallida (Brod.), 

 which Tryon considers identical with anomala, has more folds, 10 or 11 

 on the last whorl in specimens examined, and they are obtuse, not 

 pointed as in S. dalli ; the spiral cords are much less prominent, their 

 intervals nearly flat instead of concave, and bear finer, less unequal 

 threads; moreover, there is a well-marked posterior apertural sinus in 

 all of the specimens examined, while in S. dalli there is none. 



Solenosteira elegans Dall (Bull. Mus. Comp. Zool., XLIII, p. 300) 

 from the Gulf of Panama, is a more compact shell than S. dalli, with 

 narrower, longer ribs. S. vaughani Dall, from the Floridian Miocene, 

 is also related. The last surviving Solenosteira in Antillean waters 

 was S. mengeana Dall, from the Caloosahatchie Pliocene. 



Phos gatunensis Toula. PI. XXV, figs. 1, 2. 



Phos gatunensis Toula, Jahrb., p. 701, PI. 28, fig. 6; PI. 25, fig. 11. 

 Toula's specimens of this species were poor, so that further descrip- 

 tive notes and figures may be useful. It differs from Phos metuloides 

 Dall, from the Oligocene of Monkey Hill, by having rather narrow and 

 sharp spirals, not in the least straplike at any stage of growth, and 

 there are not so many longitudinal ribs. Phos gabbi Dall, from the 

 Oligocene of Santo Domingo and Jamaica, is very closely related to 



