1889.] NATURAL SCIENCES OF PHILADELPHIA. 93 



striae; epidermis absent, H. 19, W. 12, apt. 14, D. apt, 9 mill., Hab. 

 Aura. Island, E. L. Layard, Esqr. 



Obs. Certainly distinct from D. de Latouri from the same Island. 

 All examples received are destitute of epidermis. 



Trochomorpha convexa, Nobis. PI. V. fig. 7. 



Shell sub-lenticular, thin, very convex above; whorls six, convex 

 above and beneath, acutely carinate, finely and transversely striate; 

 base smooth ; umbilicus perspective one-sixth the diameter of the 

 shell ; aperture oblique; peritreme simple ; color reddish brown with 

 a narrow darker line on the carina ; H. 7, D. 12 J, H. apt, 2A, D. 

 apt, 6 mill. Hab. Aura Island, New Hebrides, E. L. Layard. 



Obs. A more stout, convex shell, with more whorls than T. ru- 

 bens from the same Island. 



Helicina Bourailensis, Nobis. PI. V. fig. 8. 



Shell thin and translucent, depressly conoid ; base convex; spire 

 subacute ; whorls 5, striate with fine oblique lines of growth, which are 

 decussated by strong-spiral striae; suture linear, impressed; basal 

 callus white, thin, and minutely foveate ; aperture sub-ovate, very 

 oblique; peritreme augulated at its junction with the short colum- 

 ella; outer lip slightly thickened ; suborbicular; color a pale yellow 

 or reddish ; color of the aperture partaking of the color of the shell. 



Height 3, diam 5 mill. 



Hab. Bourail Island, N. Caledonia. E. L. Layard, Esqr. 



Helicina Nehoueensis, Nobis. PI. V. fig. 9. 



Shell thin, polished, depressly conoid, convex beneath; spire sub- 

 acute; whorls 5; lines of growth fine, decussated above and beneath 

 by very fine interrupted spiral striae, in V-shaped fasciculi ; suture 

 linear, impressed ; aperture sub-oval, very oblique, of a reddish 

 color; lip white, thin and slightly reflected; peritreme augulated 

 with the short columella; color pale reddish brown, darker beneath ; 

 callous thin, silvery white and corrugated. Height 2? to 4, wide, 

 4 to 6 mill. 



Hab. Nehoue, New Caledonia. 



E. L. Layard, Esqr. 



Helicina Saxoniana, Nobis. PI. V, fig. HI. 



Shell thin, depressed conoid, convex beneath; whorls 4, rounded 

 above ; suture impressed ; lines of growth regular, parallel and very 

 fine, which are decussated by interrupted sph'al striae; spire sub- 

 acute; aperture sub-triangular, oblique, pale reddish ; lip thin, white 



