22 HALIOTIS. 



of specimens, which Vcary in striation as well as in markings 

 from each other. 



17. Taylokiana, f. 91, Reeve. — Testa oblongo-ovalis, 

 sublsevigata, postice subattenuata, fusco viridis, maculis 

 fuscis iiigro-marginatis picta, spiraliter leviter lirata intus 

 argentea, iabio externo circa spiram extenso. — Of an elongate 

 oval form, with a generally smooth appearance, only modified 

 by slightly raised spiral ridges. The dark-edged spots upon 

 a blended brown and green ground form a strong character 

 in good specimens. 



18. MARMOEATA, f. 88, 89, L'lnncEus. — Testa ovalis, sub- 

 concava, striis spiralibus, varie duplicatis et alternatis cum 

 striis tenuibus decussata, medio vix depressa, rubra, maculis 

 albis medianis vel lateralibus variegata ; foraminibus parvis, 

 vix elevatis, area marginali lata subequaliter striata ; aper- 

 tura antice subtruncata, Iabio interne lato, planulato. — The 

 late Mr. Eeeve figi'res the variety, fig. 89, as virginea of 

 Chemnitz, evidently by error. A somewhat smaller and 

 more rosy specimen is the type of his H. rosacea. Danker 

 figures the variety fig. 88 as tuberculata var. striata of 

 Linnaeus. To me it seems plain that the species now given 

 is the true marmoratiis of Linnasus, as figured by Martini and 

 accepted by Gmelin and Dillwyn. It is the decussata of 

 Philippi. 



19. GrRUNERi, f. 57, Philippi. — Testa ovalis subcom- 

 planata, concentrice leviter undulatim plicata, spiraliter 

 liris elevatis, crebris minutissime squamosis sculpta ; fusca 

 rufescens, maculis magnis vividis variegata ; tuberculis 

 foraminiferis parviusculis, 9 perviis ; intus argentea. — The 

 very finely scaled ridges give a softened raspiness of texture 

 to this beautiful shell, which is brown, varied with spots of 

 darker colour. 



20. TUBERCULATA, f. 66, 67, 102, 115, Linnctus. — Testa 

 ovata convexiuscula, tenuiter spiraliter striata, fusco, rubro, vel 

 viridiangulatim variegata ; radiatimplus minusveirregulariter 

 plicata ; area marginali post angulum foraminiferum excavata, 

 tum versus marginem tumida, rugose lirata. — Grenerally of 

 the usual oval form, with a tendency to shew undulating 

 plaits ; striae variable, seldom raised, in couplets or equal ; 

 marginal area hollow under the tubercular ridge, then turned 

 and coarsely ribbed. The elongated specimen, f. 102, belong- 



