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an inhabitant of deep water. The species here described is of a much 
more ovate form than those already known, and is only cancellated 
near the apex of the spire. The circumscribed inner lip and mitri- 
form appearance will at once mark the genus Metula. 
Hoxcostoma. (Nov. gen.) 
Shell ovate, thin, spire short, acuminate ; suture channelled ; aper- 
ture obpyriform, posteriorly canaliculated, anteriorly emarginate ; 
columella areuated, smooth, with a posterior callosity ; outer lip ex- 
panded, the margin everted, posteriorly free and ascending on the 
body-whorl. 
This peculiar form, which we have here characterized as generic, 
most resembles Planaais in texture and general character, but is at 
once distinguished from that genus by its short channelled spire, by 
the peculiar form of the aperture, and by the solution of the peri- 
treme at the junction of the outer lip and last whorl. 
Howcostoma seticeruM, A. Adams. (Pl. XX. fig. 5.) H. testa 
ovata, semipellucida, fusco-cinerea, fascia lata, lutescente, et 
linea angusta, rufo-fusca ornata, transversim sulcata, sulcis 
setis aureolis, elongatis, epidermicis, in seriebus transversis 
dispositis ornatis. 
Hab. Mauritius. Mus. Cuming. 
The surface is beautifully ornamented with long golden bristles, 
arranged in transverse rows. 
Morvum xantuostoma, A. Adams. WM. testa oblonga, subcylin- 
drico-conoidali, spira depressa, complanata, nigro alboque varie- 
gata, dorso tuberculis rotundatis in seriebus quinque dispositis; 
apertura angusta, intus lutea; labio granuloso, expanso; labro 
extus incrassato, recto, antice inclinato, intus valde dentato- 
lirato. 
Hab. Galapagos Archipelago. Mus. Cuming. 
Oniscia tuberculata, Sow., var. a, Reeve, Conch. Syst. 
This species, which has been confounded with M. tuberculatum of 
Sowerby, figured in the ‘Genera’ of that author, and twice figured as 
a variety of that species by Mr. Reeve, is at once distinguished by 
its conoid form, yellow aperture, and flattened spire, characters which 
are constant and specific. I have used the name Morum as restricted 
to the tubercular species of the genus Oniscia. 
Vanicoro ruGATA, A. Adams. VJ. testa orbiculato-ovata, sub- 
globosa, crassa, albida, spira subproducta, longitudinaliter valde 
plicata, anfractu ultimo plicis irregularibus, longitudinalibus et 
liris subgranulosis, transversis, prominentibus decussata ; aper- 
tura rotundato-ovali ; labio arcuato, postice et antice dilatato; 
umbilico mediocri ; canali subpatulo, arcuato. 
Hab. 2 
