ART. 22 MIOCENE GASTROPODS AND SCAPHOPODS MANSFIELD 61 



one occupies the median part of the whorl; on the following whorl, 

 another spiral begins. Body whoii with seven primary spirals above 

 the peripheral carina and four on the base between the lower carina 

 and the umbilicus. Aside from the primary spirals, there are minute 

 spiral threads — two at first, increasing to four in the depressed sub- 

 sutural area, many below the carini, and one to two lying between 

 the primary spirals. Umbilicus deep and wide and spirally marked 

 with small threads. A few very fine axials cross the last whorl and 

 enter the umbilicus. 



Dimensions: Type and only specimen {U. S. Xat. Mus. Cat. Xo. 

 352691) measures: Altitude 1.7 mm.; greatest diameter 4.5 mm. 



Occurrence. — Middle or lower Miocene : In flood-wash, Caroni 

 County, Montserrat Ward, 1 mile south of Brasso, Trinidad. 



Class SCAPHOPODA 



Genus CADULUS Philippi 



CADULUS CARONENSIS, new species 



Plate 7, fig. 6 



The shell is rather small, solid, evenly and quite strongly curved 

 with its greatest diamemter 0.7 mm. from the anterior end where 

 the shell is slightly bulged. The convex arc is quite evenly and 

 broadh' rounded posteriorly forward to the equator, the posterior 

 fourth forming a little narrower curve. The convex arc is slightly 

 more curved than the concave side, the posterior region being a little 

 more so. Dorsal slope, at anterior end, is more steeply inclined than 

 on the ventral side. Surface marked by faint, wide-spaced, narrow, 

 loAv spirals, anteriorly increasing in width. Anterior aperture is 

 broadly elliptical, the lateral axis being the greater; peristome 

 minutely denticulate. Apical aperture nearly round, margins 

 slightly undulated and indistinctly dendiculated. 



Dimensions: Type (U. S. Nat. Mus. Cat. No. 352692) measures: 

 Length 5.8 mm. ; maximum diameter 1.3 mm. ; diameter of anterior 

 aperture. 0.9 mm.; diameter apical aperture, 0.5 mm- 



The new species at first insjiection recalls Cadulus parianus Guppy 

 collected from the " Ditrupa bed," Pointe-a-pierre, Trinidad ; but 

 when closely compared is found to be a larger fchell, with no marked 

 contraction at its posterior end, and its maximum caliber more an- 

 teriorly situated than in Gupj^y's species. The Eocene species 

 Cadulvs ahruptvs Meyer and Aldrich, is quite similar in general 

 aspect to the new speces, but that is a larger shell and has a less 

 curved outline. 



Occurrence — Middle or low^er Miocene : In flood-wash, Caroni 

 County, Montserrat Ward, 1 mile south of Brasso railway station. 



