90 Mr. J. C. Melvill on the 



Mitra [Pusia) EUzce, sp. n. (PI. II. fig. 2.) 



M. testa utrinque attenuata, fusiformi, solidula, albescente ; an- 

 fractibus 10-11, apicali nitida, perlaevi, cseteris gradatulis, apud 

 sutiiras impressis, arete longitudinaliter costatis, undique spi- 

 raliter sulcatis, sulcis crebris, ultimo in anfractu 13, pcuultimo 

 4-5, ad juiicturam costarum summam ocbraceo-punctatis vel 

 lineatis, interstitiis aliter laevibus ; anfractibus superae juxta 

 suturas, et iu ultimo, apud medium fuseo-cinctis, ad basim pauUum 

 nodulifero ; apertura oblonga, fuseescente ; labro recto, extus ad 

 partem infcram crenulato ; columella ochraceo-tincta, quadri- 

 plicata. 



Long. 18, lat. 6*50 mm. 



Hah. In coral-sand, dredged at 1 fathoms, Sheik Shuaib 

 Island, Persian Gulf. 



Two fine examples of a Pusi'a of elegant fusiform contour, 

 attenuate at both ends, somewliat solid, vvhite, ten- to eleven- 

 whorled, the apical being shining, smooth, the remainder 

 gradate and compressed at the sutures, smooth, closely ribbed, 

 and spirally crossed by many revolving sulci, these being 

 orange-dotted or lineated at the point of junction with the 

 centre of each rib. Obscurely at the sutures, but very distinctly 

 in the centre of the last whorl, run spiral fuscous zones ; this 

 latter shades off gradually towards the base; the aperture is 

 oblong, fuscous ; outer lip straight, crenulate in its lower part ; 

 columella tinged with ochre, four times plaited. 



Allied to M. infaustUj Reeve, from Ticao, and M. fulvo- 

 sulcaio, Melv., from Mauritius and Lifu. Keither of these 

 species, however, has the fusiform contour nor any sign of 

 the brown central fascia, though agreeing in the ochreou3 

 spiral sulci. 



Mitra (Costellaria) revelata, sp. n. 

 (PI. II. figs. '6, 3 a.) 



M. testa turriculata, fusiformi, albida, parum nitente, solidiuscula ; 

 anfractibus 10-11, apicalibus stppc puuicco-tiuctis, caeteris grada- 

 tulis, superne arete longitudin.iliter costatis, costis laevibus, 

 obtusis, ultimo in anfractu, praecipue dorsaliter, jJcrumque ievQ 

 evanidis, superficic longitudinaliter tcnuitcr brunneo-lineata, apud 

 medium obscure bruuneo-zonulata ; apertura oblonga, alba ; labro 

 exteriors recto, crassiusculo ; columella quadriplicata. 



Long. 21, lat. 8 mm. 



Hah. Sheik Shuaib Island, 7-20 fathoms, in sand and 

 mud; in 10-15 fatlioms off Kais (or Gais) Island, in shingle 

 and dead coral, Persian Gulf. 



