1913.] NATURAL SCIENCES OF PHILADELPHIA. 23 



Altitude 40, diam. 13, aperture alt. 22.5, diam. 7 mm. 



Locality. — Panama. 



The types are in the collection of The Academy of Natural Sciences, 

 number 107,159, collected by Mr, S. N. Rhoads. This species is 

 wider than the Japanese Metula elongata Dall and has a longer 

 aperture. It differs from Metula gahhi B. and P. in being higher, 

 narrower, more cylindrical, in having the sculpture on the early 

 whorls less compact, base more attenuate, aperture longer, and the 

 columella not so sinuous. 



I take pleasure in naming this species after Dr. Amos P. Brown, 

 one of the authors of Metula gahhi, the Oligocene species which is 

 probably the ancestor of this form. 



HaplococWias swifti n. sp. 



Shell small, umbilicate, turbinate, white, suture deeply im- 

 pressed, spire elevated, whorls 5, very convex, contabulate, the first 

 whorl somewhat eroded, the two following whorls bicarinate, the 

 penultimate and bodj^ whorl more or less tricarinate. The body 

 whorl is sculptured with 24 spaced spiral striae with microscopic 



P'ig. 3. — Haplocochlias swifti Van. 



vertical striae in the interstices. The fourth, sixth and eighth striae 

 below the suture on the body whorl are larger than the others and 

 three or four striae near the umbilicus are closer together. The 

 umbilicus is of moderate size. The aperture is orbicular, peristome 

 continuous, very thick, and broadly refiexed, crenate, parietal 



