1911.]' NATURAL SCIENCES OF PHILADELPHIA. 355 



recurved above the shoulder, where there is a deep pit behind each 

 varix. The tubes are short, midway between the varices, and placed 

 upon low, short folds. The aperture is very small, oval, with a raised 

 rim. Anterior canal closed, bent to the right, having three projecting 

 angles on the left side. 



Length 14, diam. 7.3 mm. 



Based upon a single quite perfect individual. The sculpture is 

 very characteristic. 



STROMBIDiE. 



Strombus gatunensis Toula. PL XXVI. 'figs. 3, 4, 5. 



S. gatunensis Toula, Jahrb., p. 698, PI. XXV, figs. 7. 8. 

 This species resembles S. pugilis alatus Gmel. in having the last 

 whorl smooth except for rather weak spiral cords below the suture 

 and on the base, the shoulder being unarmed. It differs from alatus 

 by the neanic whorls, which in alatus are subangular, with folds much 

 larger than m gatunensis, prominent at the shoulder, fade out above 

 and below. In both species the spire is strongly, evenly striate 

 spirally. In S. gatunensis the spire is concave-sided, attenuate and 

 lengthened, the whorls strongly convex, finely and closely plicate 

 longitudinally, the folds extending from suture to suture. On the 

 penultimate and next earlier whorls the folds become obsolete above, 

 remaining short, close nodes on the antepenultimate, larger, separated, 

 subacute tubercles on the penultimate whorl. The last whorl has an 

 obtusely angular shoulder. There are several coarse spiral stria? 

 below the suture, and the lower part is spirally striate. It becomes 

 tumid towards the aperture. The outer lip is somewhat thickened, 

 has a very shallow notch near the lower end, and is weakly wrinkled 

 within, but smooth in the throat. 



In one specimen seen there are about two varices on each of the 

 whorls of the attenuated part of the spire. The other shells have none. 



Fig. 5. Length 45, diam. 28. 5 mm. 



Fig. 4. " 50 mm. 



In Strombus bifrons Sowb., of the Oligocene of Haiti and Jamaica, 

 the folds on the spire are coarser than in S. gatunensis; the tubercles 

 persist and are somewhat spiniform on the last whorl, where also the 

 spiral striation is much more strongly developed. 

 Strombus C?) sp. undet. PI. XXVI, fig. 7. 



An internal cast preserving none of the shell is referable to this 

 genus or possibly to Orthaulax. It is peculiar in having an erect flange 

 on one side of the last whorl at the suture, indicating such an ascending- 

 lobe in the sutural region as characterizes Orthaulax gabbi Dall. 



