166 PROCEEDINGS OF THE MALACO LOGICAL SOCIEXr. 



Hah. — Persian Gulf, Mussandam, 50 fathoms. 



A graceful, attenuate species, of the same alliance as M. oMusicostata, 

 Smith, Polynesiensis, Eeeve, or Alicia, M. & Stand., these being all 

 of more abbreviate form. The apex is ochraceous, and beautifully 

 microscopically decussate. Of the two specimens selected as types, 

 the larger is not adult, while its fellow has all the labial characteristics 

 well developed. 



Mangilta apollinea, n.sp. PI. X, Fig. 20. 



M. testa parva, ovato-fusiformi, albida, subnitente, nequaquam 

 striata, anl'ractibus 5, apicales lasves, parvi, caeteris gradatis, Isevissimis, 

 undique longitudinaliter costatis, costis crassis, super medium 

 anfractuum conspicue et acute unicarinatis, carina ad juncturam 

 costarum gemmata, apertura oblonga, ad basim angustiore, labro 

 incrassato, extus, supra medium, unigemmato, margine columellari 

 fere recto. Long. 5, lat. 1-75 mm. 



A scalate Mangilia, white, principally conspicuous for its thickened 

 longitudinal ribs, 9-10 in number on the body- whorl, the interstices 

 quite smooth, one spiral keel alone, a little below the sutures, 

 crossing the ribs at right angles, and at the point of junction bearing 

 a beaded point. 



Mangilia barbiton,' n.sp. PI. X, Fig. 21. 



M. testa gracili, utrinque attenuata, alba, parura nitida, anfrac- 

 tibus 8, apicalibus tribus tumidis, vitreis, cseteris ad suturas multum 

 impressis, supernis parvis, ultimo permagno, undique longitudinaliter 

 costulatis, costulis ad juncturam lirarum spiralium arete gemmulatis, 

 apertura anguste oblonga, labro incrassato, albo, sinu inconspicuo, 

 columella recta, canali paullum producto. Long. 8'50, lat. 3 mm. 



A most elegantly formed Mangilia, which perhaps might with equal 

 propriety be termed a Cythara, very abundant in shell-sand ; all dead, 

 but the examples are hardly bleached, and are probably white in life. 

 Slight traces of a yellow peripheral zone are to be noted in some 

 instances. 



Mangilia callistephana, n.sp. PI. X, Fig. 22. 



M. testa angusta, fusiformi, solida, albo-ochracea, anfractibus ad 8, 

 quorum apicales duo nitidi, vitrei, globulosi, caeteris ad suturas im- 

 pressis, supernis bi-, ultimo tricarinulato, cannula superiore prsesertim 

 gemmato, gemmis couspicuis, ultimi anfractus circa 12, ultimo infra 

 peripheriam ad basim spiraliter octolirato, apertura oblonga, labro 

 incrassato, sinu lato sed non profundo, columella fere recta, canali 

 brevi. Long. 6, lat. 2 mm., sp. max. ; long. 3, lat. 1 mm., sp. min. 



One of the most locally abundant Pleurotomce in the dredged shell- 

 sand ; also found in live condition, when it is seen to be pale ochreous 

 white, with a semi-transparent appearance. The specific name is 



Barbitou, a striuged instrunieut. 



