80 CONTRIBUTION TO THE PALEONTOLOGY OF TRINIDAD. 



instead of extending to the sulcus as in that species, become obsolete a short 

 distance below the shoulder; nor has the Soldado shell the five impressed spiral 

 lines revolving round the basal part of the body whorl below the sulcus,— only 



._. rather faint line is present. A more striking difference between these forms 

 is the breadth of the shoulder of the last volution in the Saldado shell, and the 

 very strong wrinkles which pass diagonally across it and over the penultimate 

 whorl. These wrinkles recall at once those of P. ostrarwpis, but in that species 

 they do not extend over the preceding whorl ; the Soldado shell also resembles 

 P. ostrarwpis in the general form of the lower part of the body whorl which is 

 broader and less pointed than in scalina. 



As the Soldado shell is thus about equally allied to both scalina and ostrarwpis 

 of the Gulf Coast Midway, it would be perplexing to determine which affinity is 

 closer, and rather than place it as a variety of either, it is described as an inde- 

 pendent, but intermediate species. 



Remarks.— It is an interesting fact showing the close resemblances between 

 the Soldado Rock, Bed No. 2 fauna, and that of the southern United States that a 

 specimen of scalina from the Lignitic beds at Nanaf alia, Alabama, in the Cornell 

 University Paleontological Museum (No. 12110) shows the same tendency of the 

 longitudinal plications to become obsolete not far below the shoulder of the last 

 volution. The diameter of the Soldado Pseudoliva is about 15 mm. 



Dr. C. A. White in 1887 described from the Rio Maria Farinha beds, State of 

 Pernambuco, Brazil, Harpa dechordata** which Professor Harris in 1896 placed 

 with a question under the synonymy of Pseudoliva scalina.™ This Brazilian 

 form is unlike the Soldado shell, but it is very like Pseudoliva scalina which it 

 almost certainly is. 



Locality.— Bed No. 2, Soldado Rock, near the Serpent's Mouth, Gulf of Paria. 

 Geological horizon. — Midway Eocene. Equivalent to that of Alabama and 

 of Rio Maria Farinha beds. State of Pernambuco, Brazil. 



j 



Genus COLUMBELLA Lamarck, 1799. 

 Columbella labreana new species. Plate XII, Figure 1. 



Description. — Shell very small, biconic, very convex; number of whorls five 

 the first being nuclear, very small and smooth (lacking in the specimen illus- 

 trated) ; subsequent whorls ornamented by flattened spiral threads most marked 

 towards the base of the shell and becoming obsolete above the middle of the last 

 volution; longitudinal sculpture of regular, narrow, close-set, rounded ribs (eigh- 

 teen on the last whorl), not extending quite to the suture, being interrupted above 

 by a narrow, subsutural band; outer lip somewhat thickened, internally dentate 

 on the margin and Urate within, columella very finely and closely plicate. 



Height of shell 5, greatest width 2 mm. 



Remarks.— This little shell seems to be akin to Sowerby's C. haitensis, as 

 far as one can judge by a bare description. 



"J Arch, do Museu Nac. do Rio de Janeiro, VII, pp. 136-137, pi. XIII, figs. 7, 8. 

 ** Bull. Am. Pal.. I. n. 214 



