1911.] NATURAL SCIENCES OF PHILADELPHIA. 351 



tured whorl, to coarse, rounded, vertical ribs equal to their interstices. 

 These continue for about two whorls, after which the adult sculpture 

 of fine, close vertical riblets sets in, either abruptly or by a short but 

 gradual transition. 



Metula gabbi n. sp. PI. XXV, figs. 4, 8. 



This species is represented by three broken specimens, the spire, 

 beyond the penultimate whorl, being wanting. It is closely related 

 to Metula cancellata Gabb, from which it differs as follows. The 

 sculpture of narrow longitudinal folds and spiral cords is much coarser. 

 There are 40 to 43 spirals on the last whorl (counting the smooth ones 

 at the anterior end). In M. cancellata the upper two or three spirals 

 are separated by wider or deeper grooves than the rest, but in M. gabbi 

 this is not the case. The longitudinal folds on the last whorl of 

 M. gabbi are about twice the size of those of M. cancellata. On the 

 spire the spirals do not pass over the longitudinal folds in M. gabbi 

 as they do in M. cancellata. The apertures are alike in the two species. 

 In the largest Gatun specimen the last whorl, measured in front, is 

 20.5 mm. long. 



COLUM BE LLID ^ . 

 Anaohis fugax n. sp. PI. XXV, fig. 5. 



A species of the A. avara group, slender, with long, acuminate spire. 

 The first whorl is very minute; embryonic shell conic, composed of 

 3 or 3;j convex, smooth whorls, which taper more rapidly than the 

 following whorls. The next two whorls are smooth ; then longitudinal 

 rounded ribs gradually begin, increasing in size to the last whorl. 

 These ribs arch backward or are nearly straight, extend from suture 

 to suture and are a little wider than their intervals. On the last 

 whorl they weaken below the periphery. There are 3 to 3^ rather con- 

 vex sculptured whorls, separated by an impressed suture, below which 

 there is a narrow ledge or indistinct cord. The basal half of the last 

 whorl is coarsely lirate spirally, the spirals coarsest in the concavity 

 of the base. Above the periphery and on the spire, spirals are wanting 

 or sometimes barely traceable in places, but just behind the outer 

 lip they extend farther up than elsewhere. There is an indistinct 

 broad variceal thickening behind the outer lip. The small aperture 

 has several weak lip-teeth. 



Length 11, diam. 4.25 mm., length of aperture 5 mm.; whorls about 

 9. Ten ribs on the last whorl. 



Somewhat smaller specimens in the same lot have 13, and an imma- 

 ture shell as many as 15 ribs on the last whorl. This species is in or 



