OF MOLLUSKS FROM WESTERN NORTH AMERICA. 280 



Narica INSCXJLPTA. 



K. t. " N. apert£E" simili, aed magis compacta ; paullum angtis- 

 tiore, umbUico tamen majore ; lineis spiralibus circ. w\\. dia- 

 tantibus insciilptis cincta, quaruin x. in unfr. penult, nionalraii' 

 tur ; postice lineis incrementi vix conspicuis. 

 Lonj^. -3, long, spir, -OH, lat. -28; div. 100°. 

 Hab. Acnpulco, oii Ostrea irideseens, Rowell. 

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

 has the sculpture in irregularly raised lir^lse, 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 sj)ecies having the coppery flavour which Americans dis- 

 like in the British species. From the outside of tlie valves, ^Ir. 

 Kowell obtained this and many other interesting species. 



Drillia EBURNEA. 



D. t. tvrrita, carneo-albida, temdore, Itevi, inaximenitente; mar- 

 ginibus spirce rectis ; anfr. niicl.1 . . . [decol/atis] ; norm, 

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

 excurvatis ; hie et illic ruyis radiantibus, vbsoletis, irreyula- 

 rihns exaculpta ; basi prolongata, canali conspicuo, aperto ; 

 ainu postico minore, in aulco lata, hand definito, spirant aac^n- 

 dente aito ; la bro acuta ; labia indistinct o ; culumelta planata. 



Long. r3, long. spir. '8, lat. •4.5; div. 30°. 



Hab. Near Gulf of California (teste Rowell). 



Easily recognized by its smooth glossy as{)ect and French-white 

 colour ; the notch lying along a broad s|)iral channel, which throws 

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



Mangelia albolaqueata. 



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

 7iucl.? . . . [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 

 ".altoso ; sinu postico majore, suturam attingente. 

 Long. -88, long. spir. -hh, lat. -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. 1863, p. 66!), as a Brillia. 



EULIMA FALCATA. 



E. t. valde tereti, valde cvrvata, alba, politissima, soHdiore, 

 tnarginibus spirts meniscoideis ; anfr. nvcl.1 . . . [detrilis^ ; 

 norm. circ. x., planatis, lenfe avgentibvs ; axi hamatu , snturia 

 indistinctis; basi elongata, hand terrti ; aperfvrn jigrijiirmt, 

 antice latiore ; labroacuto; labio tenui, apjiresso. 



18 273 



