I8S8.J MR. G. B. SOWERBY ON NEW SPECIES OF SHELLS. 21 I 



They were too imperfect satisfactorily to describe. Mr. Bairstow 

 has now sent me a specimen in very fair condition, which, tliouj^h not 

 absolutely perfect, shows all the essential characters of the species. 



Pleurotoma bulowi, sp. nov. (Plate XI. fig. 16.) 



P. testa elongato-fusiformi, utrinque atteiiuata, pura alba. 

 Anfractus 13, prinii 2 rotunde convexi, poliii ; cceteri acute 

 carinali, ubique dense spiraliter lirati ; spira acutissima. An- 

 fractus ultimus leviter convexus, ad basin valde contraitus et 

 multo prodnctiis. Aperturn ovata, sum elongato, angusto emar- 

 ginuta ; canali gracili, elunyato. 



Long. 35, mnj. diam. 10. 



Hab. China Sea. 



A pure white, keeled, and closely ridged species of the typical 

 form of P. babylonica. 



Turritella robusta, sp. nov. (Plate XT. fig, 18.) 



T. testa curta, solida, albida ; anfractus \y), modice accrescentes, 

 convexi, rotundati, spiraliter regulariter 7 lirati ; l/ris aciitis ; 

 sutura impressa ; anfr. ultimus subveutricosus, rotundatus, liris 

 1 0, ad basin minoribus. Apertura subcircularis ; peristoma 

 crenulata ; columella per crassa. 



Long. 29, nrnj. diam. 13, upert. long. 6g, lat. G millin. 



Hub. ? 



A remarkably short, solid, sharply lirate species. Specimen at 

 present unique. 



Cassis cernica, sp. nov, (Plate XI. fig. 19.) 



C. testa ovato-oblonga, lavis, polila, fulvescente lactea ; maculis 

 fuscis pallidiusculis, oblongo-quadratis, sex-fasciatim dispositis 

 picla. Spira elata, ad apicem acutiuscula, fusca ; sutura 

 impressa J anfractus 6, convexi, rotundati; ultimus elorigatus. 

 Apertura oblonga ; fauce Icevi ; labriim arcuatum, mediocriter 

 incrassatum, antice dentatum ; margine externa leviter reflexo, 

 fusco vivide notato ; columella callosa, polita, basin versus plicata. 

 Long. 32, maj. lat. 17 millim. 

 Hab. Mauritius. 



Among several specimens of this pretty little species recently 

 received from Mauritius there is some variation in form, one or two 

 of them being stouter than the type. The smallest specimen is 

 23 millim, in length. There is but little variation in the colouring. 



Helix boxalli, sp. nov. (Plate XI. fig. 13.) 



II. testa yloboso-depressa, anyuste sed profunda umbilicata, fusca, 

 fascia nigra pallida marginata ad peripheriam cincta ; spira 

 depressa ; anfractus ik, primi 2^ rotunde convexi, poliii ; 

 cteteri planato-convexi, granulis minutis, acideatis, et pilis erectis 

 regulariter et dense scabrati ; sutura impressa ; anfr, ultimus 

 .subacute angulutus, supra unguium planato-convexus, infra sub- 

 injlutus. Apertura latiuscula, subrotundata, vix obliqua, inlus 



