THE NAUTILUS. 91 
entire, conic, with very regular outlines. Whorls 12-13, convex, 
regularly increasing, furnished with small warts, becoming obsolete 
at the base of each whorl and disappearing on the two last ones and 
sculptured with fine incised spiral sulei more crowded towards the 
base of the shell. Suture impressed, canaliculate on the last volu- 
tions. Body whorl broadly oval, rounded, often more convex below 
its middle. Aperture oval, angular above, not much effuse nor 
oblique, scarcely sinuous, livid within. Columellar edge thick, 
regularly arched. Operculum as usual in the genus. 
Long. 30, breadth 10, height of aperture 9 mill. 
Island of Vate, New Hebrides (E. L. Layard). 
This has been submitted for identification to Dr. A. Brot, the 
regretted author of many papers on Melanians and he wrote me that 
he received the same shell from Dr. W. D. Hartman under the 
erroneous name of Melania marici Gass. He was unacquainted 
with the shell from Vate and thought it may prove to be an un- 
described species, so that I venture to give a name to it, under Dr. 
Brot’s undisputed authority. 
Neritina coccinea Anc. 
Shell solid, oblong, not shining, reddish-yellow, without markings, 
tinged with orange near the aperture, finely striated, not spirally 
sculptured, convex but not globose. Spire distinct, obtuse, lateral, 
entire, consisting of two whorls only, very rapidly increasing, the 
last one very large, transversely oval. Suture linear. Aperture 
oblique, with the superior edge long and elliptical connected with 
the basal by a large flat and thick callosity of a dull whitish or livid 
color. Margins not remote. Outer margin acute. Septal area 
without teeth. Operculum red, thin. 
Diam. 63, height 5, do. of aperture 43 mill. 
Island of Vate, New Hebrides (EK. L. Layard). 
This very pretty little species is quite different from any one I 
know of. It may perhaps be allied to Pease’s rubida, from Tahiti, 
but is very much larger. 
NEW AMERICAN UNIO. 
BY WM. A. MARSH, ALEDO, MERCER CoO., ILLINOIS. 
Unio Askewi, new species. 
Shell smooth, subrotund, somewhat inflated, inequilateral ; sides 
slightly constricted, rounded before, subtruncate posteriorly, with 
