272 AMERICAN JOURNAL 



MiTRA GLABRA, Pease. Plate 23, fig. 2. 



Description. — T. oblongo-ovata, crassa, laevigata, polita, long- 

 itudinaliter costata, costis rotundis, ad anfr. ultimo obsoletis ; 

 columella quadriplicata ; cinereo-fusca, anfr. ultimo inferne, cast- 

 aneo-fusca, fascia unica, angusta, lutea, cingulata. 



Dimensions. — Long. 15, diam. 7 mill. 



Locality. — Insl. Ascension. 



Shell oblong-ovate, solid, smooth, shining, longitudinally 

 ribbed, ribs rounded, becoming obsolete on back of the last 

 whorl ; columella four-plaited ; color greenish brown, lower half 

 of last whorl chestnut brown ; encircled by a single, narrow, 

 yellowish band. 



Nassa approximata. Pease. Plate 23, fig. 3. 



Description. — T. fusiformi-ovata, longitudinaliter costata, 

 costis vix flexuosis, interstitiis transversim striatis, spira acuta ; 

 anfr. plano-convexis ; labro varicoso, antice muricato-denticulato, 

 intus brevi lirata ; columella calloso-laminata, juxta marginem 

 tuberculata, superne unilaminata ; apertura oblongo-ovalis, su- 

 perne vix emarginata. Rufo fuscescenti, linea unica fulves- 

 cente cingulata. 



Dimensions. — Long. 27, diam. 14 mill. 



Shell fusiform ovate, longitudinally ribbed, ribs slightly flex- 

 uous, interstices impressly striated transversely, spire acute ; 

 whorls flatly convex ; lip varicose, prickly denticled before, 

 shortly ridged within ; columella callously laminated, closely 

 and evenly tuberculated near its margin, above a single short 

 lamina ; aperture oblong oval, slightly emarginate above. Color 

 dark chocolate or reddish brown, a single yellowish line on the 

 middle of the whorls. 



The above species has been heretofore confounded with N. 

 tcenia, Gm. 



It was first collected in the Pacific, by Quoy and Gaimard, 

 who described the animal. A good figure of it may also be 

 found in Voy. au Pol Sud, from specimens collected at the Samoa 

 and Solomon Islands. 



Having had opportunity of examining a large number of spe- 

 cimens, I hold it to be quite distinct fron the West Indian spe- 

 cies. It is strongly ribbed throughout and transversely striated. 

 The granules bordering the sutures, mentioned in Voy. au Pol 

 Sud, are formed by the marginal striae, and are very indistinct 

 on most of the individuals. 



