INSTITUTE OF SCIENCE, PHILADELPHIA. 417 



Teinostoma funiculus n. s. 

 Plate 23, figure 15. 



Pliocene of the Caloosahatchie, Dall. 



Shell small, of three or four whorls, polished, with a flattened spire ; 

 upper surface of the whorls near the outer edge bordered by a sharp rib 

 which in the later whorls becomes an angle in front of which the suture runs; 

 the space between the rib and the suture is flat and finely spirally striate ; the 

 whole shell is brilliantly polished, the rounded periphery is smooth, and the 

 spiral striae are again visible just outside the umbilical area on the base, or 

 the whole may be striate ; in the young shell there may be an angle on the 

 periphery, but it usually becomes obsolete in the adult ; aperture circular, hardly 

 oblique, margias not thickened ; umbilicus surrounded by a well-marked, not- 

 much-elevated keel, wide, with vertically striated, rather convex walls. Alt. 

 I.O; max. diam. 2.4; min. diam. 2.0 mm. 



This shell resembles the young of T. opsiieloius, huthas a different umbili- 

 cus, which would seem not to be filled up at maturity, is smaller and has finer 

 and sharper spiral striae. The rib on the summit is much more prominent than 

 in that shell. Still, we know as yet so little about the limits of variation in 

 these small shells — and I have reason to believe it much greater than ordi- 

 narily supposed — that if it were not for the differences in the umbilicus I should 

 have regarded T. funiculus merely as a variety of T. opsitelotus. 



Teinostoma pseudadeorbis n. s. 

 Plate 23, figures 12, 13. 



Chesapeake Miocene of the " Striarca centenaria " bed, at Temple Place, 

 near Yorktown, Va., G. D. Harris. 



Shell small, solid, with four rounded whorls, a rather depressed spire and 

 generally y^rt^,?(?r(5/.f-like form ; whorls slightly impressed in front of the distinct 

 suture, rounded at the periphery ; sculpture of numerous fine, sharp grooves 

 with wider rounded interspaces, tending to be feeble on the periphery and more 

 distant on the base near the umbilicus, but otherwise rather uniform over the 

 shell ; these are crossed by fine incremental striae, giving a somewhat punctate 

 aspect to the grooves ; base flatfish, moderately rounded, the umbilical margin 

 smooth and evenly rounded over, umbilicus narrow, deep, somewhat scalar ; 

 aperture wider than high, oblique, the pillar-lip not differentiated, but thick- 

 ened ; the body with a moderate callus, connecting the lips. Alt. 2.5 ; max. 

 diam. 5.0 mm. 



This interesting little shell might be taken for an Adcorbis, if it were not 

 for the swollen nucleus and the thickened pillar-lip. A single specimen was 

 obtained by Mr. Harris. 



Genus DILL.-WYNELLA Dall. 



Diliwynella Dall, Rep. Blake Gastr , p. 362, April, 1889 ; Bull. U. S. Nat. Mus. No. 37, p. 

 160, 1889. Type D. niodesta Dall, pi. x.\i. fig. 3. 



