160 PROCEEDINGS OF THE ACADEMY OF [1899. 



Turbonilla Kushii, new species. Plate VIII, fig. 11. 



A specimen with the upper portion badly worn is of good size, 

 moderately stout, of 12 (minus the nucleus) regularly coiled 

 whorls, nearly flat, with but a slight convexity a little above the 

 well marked suture. Transverse ribs about 24, a little oblique, 

 inclined to the left, rather narrow, rounded, with much Avider, 

 concave interspaces, which are crossed by unequal, incised lines. 

 Under a half-inch pocket lens there are two near the suture and two 

 above the periphery which form pairs of deep grooves of unequal 

 width; besides these the surface is scratched by numerous, fine, 

 unequal and irregularly spaced lines; 8 between the two sets of 

 grooves ; still finer ones above, on the upper portion of the whorl 

 and 1 between the two lowest grooves. Under the microscope, a 

 few more lines appear. Base rounded, crossed only by numerous 

 fine, nearly equal, incised, revolving lines. Aperture somewhat 

 elongate; outer-lip broken. 



Length, 9^ mm; diameter, 2h mm. ; length of aperture, about 

 2 mm. 



One specimen (No. 70,535) collected by Dr. William R. Rush, 

 at Maldonado Bay, in 3-6 fathoms, Uruguay, was labelled as T. 

 interrupta Totten. In form it is nearest the T. viridaria Dall, 

 wdth specimens of which it has been compared, but the number 

 and arrangement of the spiral sculpture easily distinguish it. It 

 is very distinct from T. clispar Pilsbry,^ from the same locality, 

 which has 8, somewhat convex whorls below the somewhat flat- 

 tened nucleus, transverse to the axis, with ill-defined transverse 

 ribs, the interspaces crossed by 6 unevenly separated, spiral grooves 

 which form oblong punctures. 



This is a similar but much larger species than T. areolata Yerrill, 

 1874, not Rayneval. 

 Turbonilla pyrrha, new species. Plate VIII, fig. 1. 



Shell of moderate size, regularly coiled, delicate yellow (when 

 fresh), thin, semitransparent, the interspaces and base cut by a 

 few, unevenly separated, incised, spiral lines. There are ten 

 slightly convex whorls below the prominent, shining, slightly 

 oblique, flattened nucleus. Suture moderately deep. Transverse 

 ribs about 40, very delicate, but little raised, perpendicular, sepa- 



3 These Proceedings, p. 296, Pi. VI, figs. 5-7, 1897. 



