1903.] NATURAL SCIENCES OF PHILADELPHIA. 273 



mutually separate the larger of the nuclear whorls. Length 2.25 mm., 

 width 1.2 mm. Many specimens. 



Drillia harmonica i>. sp. 



A well-defined new species, quite rare in the Lower Vicksburg, 

 and not yet found in the upper marls. It is rather stout, the 

 spire apparently narrowing somewhat more rapidly toward apex. 

 Nucleus simple and composed of three or four whorls. The sub- 

 sequent whorls are rather short, each with some eight or nine 

 strongly marked rounded ribs, longitudinal in direction or nearly so, 

 and generally in line from one whorl to the next; they extend nearly 

 throughout the length of the whorl, becoming obsolete only in 

 the narrow revolving concavity below the ante-sutural elevated 

 collar, which is rather thick and conspicuous and marked posteriorly 

 with olie or two striae. Each whorl has some seven or eight nearly 

 equal revolving lyrse, those near the middle mutually separated as a 

 rule by a finer line. The aperture is rather wide, the canal very short, 

 the two together but little more than a third of the total length, the 

 callus near the posterior angle of the aperture tumid and conspicuous. 

 Length 11 mm., width 3.7 mm. I had confounded this species with 

 mississippiensis, of Conrad, until a recent inspection of the type of the 

 latter shows that it is very different; mississippiensis is very stout 

 much larger, with the revolving concavity below the sutural collar 

 very wide, constituting about half the entire length of the whorl ; the 

 short, broadly rounded ribs are confined to anterior half of the whorls 

 and are obsolete in the posterior concavity. The specimen is somewhat 

 water-worn, so that the sculpture is not distinct, but there are appar- 

 ently revolving raised lines which distinguish the species at once 

 from the smooth and otherwise very different ehoroides. The type 

 seems to be unique. 



Scobinella pluriplicata n. sp. 



In the genus Scobinella, of Conrad, it should be stated that the 

 species occurring at Red Bluff is distinct from ccelata of the Upper 

 Vicksburg marls, and I would propose the above name for it. 

 This species is much larger than coelata, with a relatively more elongate 

 and less rapidly acuminate* spire, and differs also in sculpture. In 

 cnelata there is a broad flattened duplex collar extending from the 

 suture anteriorly for about a fifth the length of the whorl, the surface 

 then concave to well below the middle, generally with about three 

 revolving lines at the bottom of the concavity, the middle one of which 

 is nodulose; the surface from the concavity to the lower limit of the 

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