of mollusks from western north america. 280 



Narica insculpta. 



N. t. " N. apertse" simili, sed magis compacta ; paullum angiis- 

 tiore, umbilico tamen majore ; lineis spiralibus circ. xxvi. dis- 

 tantibus insculptis cincta, quarum x.in anfr. penult, monstr an- 

 tur ; postice lineis incrementi vix conspicuis. 

 Long. -3, long. spir. -08, lat. -28 ; div. 100°. 

 Hab. Acapulco, on Ostrea irideseens, Howell. 

 The Cape St. Lucas species (vide Ann. Nat. Hist. 1864, xiii. p. 476) 

 lias the sculpture in irregularly raised lirulee, while this has minute 

 grooves chiselled out of a smooth surface. It appears that the San 

 Franciscans import the huge tropical oysters in large quantities, 

 their own species having the coppery flavour which Americans dis- 

 like in the British species. From the outside of the valves, Mr. 

 Rowell obtained this and many other interesting species. 



Drillia eburnea. 



D. t. turrita, carneo-albida, tenuiore, Itevi, maxime nitente ; mar- 

 ginibus spiree rectis ; anfr. nucl.1 . . . [decollatis] ; norm, 

 circ. ix., postice planatis, supra suturas appressis, medio satis 

 excurvatis ; hie et illic rugis radiantibus, obsoletis, irregula- 

 rihus exsculpta ; basi prolongata, canali conspicuo, aperio s 

 sinu postice minore, in suleo lata, hand definite, spirant (uio';n- 

 denle sito ; labro acuta ; labio indistincto ; columella planata. 



Long. 1-3, long. spir. -8, lat. -45; div. 30°. 



Hab. Near Gulf of California (teste Rotoelf). 



Easily recognized by its smooth glossy aspect and French-whit'? 

 colour ; the notch lying along a broad spiral channel, which throws 

 the junction of the whorl as it were up the suture. 



Mangelia albolaqueata. 



M. t. solida, turrita, alba, rudi, marginibus spirce rectis ; anfr. 

 nucl.? . . . [decollatis^ ; norm. circ. ix. subrotundatis, costis 

 circ. xi.-xv., declivibus, satis angustis, postice obsoletis, lineis 

 subregularibus spiram ascendentibus ; lirulis spiralibus anticis 

 crebris, postice obsoletis ; basi elongata ; labrol . , , ; labio 

 lali'oso ; sinu postico majore, suturam attingente. 

 Long. -88, long. spir. -.1.5, lat. -34; div. 30°. 

 Hab. Pariama (teste Rowell). 



Described from an imperfect and worn specimen, but easily recog- 

 nized by its ivory-white colour, and ribs in slantmg rows, as though 

 the creature were roofed with white tiles. It was erroneously quoted 

 in the Brit. Assoc. Rep. 1863, p. 669, as a Drillia. 



EULIMA FALCATA. 



E. t. valde tereti, valde curvata, alba, politissima, solidiore, 

 marginibus spirce meniscoideis ; anfr. nucl."! . . . [detrifis] ; 

 norm. circ. x., planatis, lente augentibus ; axi hamatas suturis 

 indistirictis ; basi elongata, hand tereti; apertura pyriformi, 

 aniice laiiore ; labro acuta i labio tenui, appressa. 



18 273 



