1890.] MARINE MOLLUSCA OF ST. HELENA. 275 



Obeliscus dolabratus (Linne). 



Ilab. West Indies ; Cut)a, Guadeloupe, and St. Lucia {d' Orbiffni/) ; 

 Island of Annabon, West Africa (Z>Mrt/fe/-) ; Red Sea; Indian and 

 Pacific Oceans. 



Several specimens were dredged in shallow water, 5-20 fathoms, 

 off the north of the island, and this I believe is the only record of 

 the appearance of this species on the eastern side of the Atlantic 

 with the exception of Annabon Island mentioned above. 



Obeliscus sanct^-helen.*. (Plate XXIII. fig. 17.) 



Testa elongnta, subpellucido-alba, linea flavescente interdum cincta, 

 nitida, perforata; anfractustiormales 7, conve.viusculi, suturu 

 mediocriter profunda separati ; nucleus conve.cus, involutus ; 

 apertura inverse subauri/ormis ; columella recta, supra um- 

 bilicum rejlexa, superne plica valida instructa. 

 Lomjit. 67 tnillim., diam. 2g. 



This species is characterized by being perforated, by its convexish 

 smooth whorls, and tlie distinct twist or plait on the upper part of 

 the columella. In most of the specimens at hand the slender 

 coloured line which revolves round the middle of the body-whorl and 

 up the spire, just above the suture, is very faint, but in a few fresher 

 specimens it is much more distinct. Some examples which have 

 the lip hroken away, thus permitting a further view within the 

 aperture, exhibit two very fine spiral plaits or lirae on the columella, 

 below the uppermost stouter one. It becomes therefore a link, as it 

 were, between the typical species of Obeliscus with three distinct 

 folds on the columella, and Syrnola with only one, agreeing with the 

 latter genus in general form and style of ornamentation. 



Obeliscus (Syrnola) pumilio. (Plate XXII. fig. 3.) 



Testa elongata, gracilis, nitida, alba, lineis paucis spiralibus 

 pellucidls ornata, lineaque unica rufescenti cincta ; anfractus 8-!), 

 leviter convexi, lente accrescentes, sufura simpUci paulo oblifpte 

 sejuncti ; nucleus globosus, pellucidus, obliquus, sinistrorsus ; 

 apertura inverse subauri/ormis, basi vix effusa ; columella paulo 

 rejlexa, superne plicnta, inferne arcuata. 

 Lomjit. 65 millim., diam. I5. 



This species at first sight looks like a miniature of <S. cinctella, A. 

 Adams, from the Korea Straits. It is, however, proportionally 

 more slender, the aperture is longer, and is ornamented with a few 

 spiral pellucid zones. 



Turbonilla haroldi. (Plate XXIII. fig. 18.) 



Testa elongato-oUonga, alba, superne leviter coarctata ; anfractus 

 G, planiusculi, turriti, sutura profunda sejuncti, ad marginent 

 superiorem incrassati, costis longitudinulibus suberectis, fere 

 aqualibus {in anfr. ult. circiter 16-18) instructi, in iuterstitiis 

 minute spiraliter striati ; apertura inverse suhauriformis, 

 superne acuminata ; peristoma continuum, margine columellari 



