1899.] NATURAL SCIENCES OF PHILADELPHIA. 161 



rated by wider, shallower spaces which are crossed by comparatively 

 few, incised, irregularly spaced lines, and also by a Avide, deep, su- 

 tural groove, often stained by oxide of iron. Well separated from the 

 groove, there is a group of from 5-7 equal and evenly spaced lines 

 and a considerable distance above are 4 or 5 somewhat wider, un- 

 evenly, but well-separated lines. Base well-rounded, cut by about 

 7 conspicuous, incised spirals, about evenly spaced. Aperture 

 somewhat elongated, well-rounded; pillar-lip straight, thin, re- 

 flected. 



Length of the largest example, 6 mm. ; diameter, 11- mm. ; 

 length of aperture, li. 



Three specimens (No. 72,050) from St. Thomas, AV. I., and two 

 worn specimens (No. 79,020) without locality. Some of them 

 were labelled as T. suhulata C. B. Adams, 1850 (not Holmes, 

 1860) and figured by Tryon. That species was described as 

 " much elongated, subulate, white, or pale brownish white with 

 two spiral bands of pale wax color and a third of the same color 

 anteriorly. Spire Avith a slightly curved axis, outline scarcely 

 convex; Avhorls ten, beside the moderately oblique nucleus; rather 

 convex with suture well impressed. Transverse ribs, 28-30, 

 prominent, slender, extending below the convexity of the body- 

 Avhorl ; the interspaces and base crossed by numerous, exceedingly 

 fine crowded spiral stride, of which one next beloAv the suture is 

 larger. Aperture ovate, acute above, labrum slightly thickened. 

 L., .17; B., .045 inches." 



Tavo smaller specimens (No. 79,017) having only 9 AA'horls differ 

 from the typical ones in having 42 ribs, tAVO AA'ide, deep grooA'es on 

 the interspaces, one at the suture and one above the middle of the 

 whorls, between Avhich, and equally well separated from them, a 

 group of 7, equal and evenly spaced, incised lines; above, near the 

 suture, are also two incised lines. These are designated as variety 

 a. A badly worn specimen (No. 79,021), Avithout locality, also 

 has 42 delicate ribs. 



Three, opaque white, weather-Avorn specimens (No. 72,053) 

 were labelled T. puncta C. B. Adams, and figured by Tryon. In 

 outline they agree Avith specimens (No. 72,050), but they have 

 but 30 transverse ribs, with the shalloAV interspaces crossed by a 

 sutural groove and well separated from it, a group of 5, equal and 

 evenly spaced, incised lines, and a considerable distance above, 

 11 



