8 PROCEEDINGS OF THE NATIONAL MUSEUM vou 79 



posterior to the periphery. These spiral cords are most conspicuous 

 on the ribs, which they likewise render nodulose. The spaces between 

 the spiral cords are a little more than twice as wide as the cords, and 

 are marked by moderately strong spiral threads, of which five are 

 present between all the spiral cords. The columella is short and 

 thick and is marked posteriorly by the feeble continuation of the 

 axial ribs and two moderately strong spiral cords and the finer 

 spiral threads between them. The anterior three-fourths of the 

 columella is marked by 10 closely approximated, rather coarse, low, 

 rounded spiral threads. Aperture narrow, decidedly channeled 

 anteriorly, weakly so posteriorly. The outer lip is thickened imme- 

 diately behind the edge, bearing on the inside a strong oblique fold a 

 little below the posterior angle of the aperture. Anterior to this are 

 two quite strong and closely approximated and partly fused denticles, 

 and anterior to these are two small denticles followed by a larger one 

 at the beginning of the anterior sinus. The inner lip consists of a 

 thick callus which is reflected over the columella and the parietal 

 wall, which forms a deep oblique fold opposite the posterior fold of 

 the outer lip. Twelve short oblique denticles, which become consecu- 

 tively a little wider from the posterior anteriorly, are also present 

 anterior to this deep fold, the most anterior one being about opposite 

 the anterior thread on the outer lip. The large fold on the parietal 

 callus and that on the posterior part of the outer lip extend strongly 

 inward and form a decided constriction of the posterior portion of 

 the aperture. 



Type.—U.S.^M. No. 381885, from Panama. It has the last 

 nuclear whorl remaining and 6.8 postnuclear whorls, and measures: 

 Length, 19.6 mm., diameter, 17 mm. 



Remarks. — In addition to the type, U.S.N.M. No. 32159 con- 

 tains two specimens collected by Bridges at Panama; U.S.N.M. 

 No. 32168 has four additional specimens obtained by the same col- 

 lector in the same place; and U.S.N.M. No. 3757b contains the 

 young specimen that has furnished us with the description of the 

 nucleus, also from Panama. 



ENGINA TABOGAENSIS, new species 



Plate 1, Figuke 8 



The shell is small. The nuclear whorls are white. The ground color 

 of the postnuclear whorls is yellowish ; first row of tubercles near the 

 summit dark chestnut-brown, the rest very dark brown. Occasion- 

 ally there are spots of flesh color on the sides of the dark tubercles. 

 The aperture is yellowish. Nuclear whorls 2.8, strongly rounded, 

 smooth, forming an almost mucronate apex. The postnuclear whorls 



