I 



OF MOLLUSKS FROM "WESTERN NORTH AMERICA. 280 



Narica INSCULPTA. 



N. t. " N. apertse" simili, sed mogis compacta ; paiillum angus- 

 tiore, umbilico tamen majure ; lineis spiralibus circ. xx^•i. dis- 

 tantibus insculptis ciucta, quorum x.in anfr. penult, inonstr an,' 

 tur ; 2iostice lineis incrementi vix conspicuis. 

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

 Hab. Acapulco, on Ostrea iridescens, Rowell. 

 The Cape St. Lucas species {vide Ann. Nat. Hist. 1864, xiii. p. 4/6) 

 has the sculpture in irregularly raised lirnlse, 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. 

 llowell obtained this and many other interesting species. 



Drillia EBTJRNEA. 



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

 ginibus spirce rectis ; anfr. nucl.l . . . [decollatis] ; norm, 

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

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

 rihns exsculpta ; basi prolongata, canali conspicuo, aperto ; 

 sinu postico minore, in eulco lato, hand dejinito, spiram a4cen- 

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



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



Hab. Near Gulf of California (teste Rowell). 



Easily recognized by its smooth glossy aspect and French-white 

 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 spiree 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 

 ".alloso ; sinu postico majore, suturam attingente. 

 Long. -88, long. spir. -.oS, hit. -34; div. 30°. 

 Hab. Panama (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. 18C3, p. G69, as a Brillia. 



EULIMA FALCATA. 



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

 marginibus spiree meniscoideis ; anfr. nucl. 1 . . . [detritis^ ; 

 norm. circ. x., planatis, lente avgeniihus ; uxi hamatu, suhiris 

 inilistinctis ; basi elongata, hand tereti; apertvra pxjrijormt^ 

 aniice luiiore ; labro acuto ; labio tenia, appresso. 



18 273 



