1895. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 39 



The preceding varieties would by most writers be regarded (and with 

 some reason) as species, but the differences they exhibit are for the 

 most part such as 1 find between the different races of T. (li.sloc«ta, when 

 a sufficient geographic series is compared. In the absence of hirge 

 suites of the Santo Domingo fossils, it seems more i)rudent for tlie pres- 

 ent to assign them varietal rank. 



TEREBRA (ACUS) AMITRA, new species. 



Shell small, acute, slender, of 10 whorls without the nucleus: whorls 

 flatfish, crossed by about 17 prominent, straight, rounded, even ribs 

 With slightly wider interspaces; spiral sculpture of sparse, sharp, in- 

 cised lines, more numerous and closer on the base, eight or nine in all; 

 sutural band absent, or not set off by sulcus or constriction; aperture 

 longer than wide, outer lip straight incrementally; canal wide; pillar 

 straight, smooth, witli its anterior edge prominent; canal short, wide; 

 siphonal fasciole distinct. Longitude, 9.5; maxiumm diameter, 2.5 mm. 



Huhitat. — Potrero, River Amina, Santo Domingo. 



Type.—^o. 113755, U. S. N. 31. 



This little species, though represented by only a single specimen, 

 seems clearly distinct. 



TEREBRA (ACUS) LANGDONI, new species. 



Shell small, slender, of 13 whorls beside the nucleus, which is small, 

 conical, and of three whorls; sculpture reticulated transversely by IG 

 low, narrow, rounded, slightly flexuous ribs, with wider interspaces, 

 the posterior ends of the ribs not cut off by the deep sulcus which 

 defines the sutural band in front; transverse sculj)ture of this sulcus 

 visible between the ribs, and four flatfish spirals, separated bynarrower 

 grooves, between the sulcus and the next suture, and seven or eight 

 narrower spirals on the base; aperture longer than wide; pillar simple, 

 smooth; canal rather long, twisted and recurved. Longitude, 20; max- 

 imum diameter, 4 mm. 



//^,/,j7rt/.— Chipola beds (2211, 2212, 2213), Calhoun County, Florida, 

 Burns. 



Type.—^n. 113913, F. S. N. M. 



y axiety perpiDU'tata, Dall. Shell with the spiral sculpture replaced 

 by fine spiral striie, obsolete or irregular, except the sulcus in front of 

 the sutural band, which is represented between the ends of each pair 

 of ribs near the suture by a deep, geueralh^ rounded, puncture or pit. 

 Found with the type in the Chipola beds (2213). 



This well-marked and rather abundant little species is dc^dicafed to 

 Mr, D. F. Langdon, late of the Alabama State geological survey. 



TEREBRA (ACUS) CHIPOLANA, new species. 



Shell small, slender, obsoletely sculi)tnred, with a pupoid nucleus of 

 four whorls and about a dozen subse(|ueiit whorls, the earlier of which 



