162 PEOCEEDINGS OF THE ACADEMY OF [1899. 



reaching to the suture, 4 evenly spaced ones, the lower one some- 

 times a little larger than the others. These are designated as 

 variety h. 



Length of the largest, b^ mm. ; diameter, 1 mm. 



Another example (No. 72,054), without locality, was labelled as 

 T. turris d'Orbigny, which is described as a very elegant, elon- 

 gated, very acute, thin, white species of 14 somewhat flattened 

 whorls. Transverse ribs (according to the figure) about 24, nar- 

 row, i^erpendicular, with spiral lines only on the base. Suture 

 impressed. Aperture subtrapezoidal ; labrum thin, columellar-lip 

 thickened, straight. 



Four specimens (No. 79,018) have more elongated whorls than 

 the typical examples (No. 72,050).. so that specimens of the same 

 number of whorls are a little longer. The transverse ribs number 

 but 28 in the largest specimen, in the others, 30. The intei-spaces 

 are crossed by a sutural groove, above and well separated from it, 

 a group of 5 incised lines; some distance above, a single more 

 distinct line and at an equal distance above, a group of 3 finer 

 ones which reach to the suture. This is called variety c. A single 

 specimen (No. 79,022), without locality, differs in having the sin- 

 gle line above the periphery as wide and deep as the sutural groove. 



Three specimens (No. 79,019) have but 32 ribs and 2 spiral 

 grooves as in variety a, but the lower group of incised lines num- 

 bers from 7-9, and the upper, 5. This is variety d. 



Turbonilla puncta C. B. Adams. 



Chevinitzia puncta C. B. Adams, Cont. to Couch., No. 5, p. 72, 1850 ; 

 Morch, Syn. Moll. Mar. lad. occid., p. 162, 1875. 



Tarbonilla puncta Tryon, Manual, vlii, p. 331, not PL 76, fig. 22, 

 1885 ; (?) Dall, Bull. U. S. Nat. Mus., No. 37, p. 128, 1889. 



C. B. Adams described this as a much elongated, white species of 

 rectilinear outline with 10 or 11, besides the nucleus, scarcely 

 convex whorls with distinct suture. Transverse ribs 26-30, rather 

 prominent, the interspaces crossed by numerous crowded spiral 

 striae, one of Avhich, a little above the middle and another at the 

 suture, are wide and deep, resembling spiral series of punctures. 

 Aperture ovate, rhombic; labium scarcely thickened. L., .22; 

 B., .05. 



According to Mr. Krebs, of St. Thomas, W. I., who examined 

 the Adams collection in 1866, there were but two miserable speci- 



