collected at Cape St. Lucas. 313 



Mr. Cuming's assertion that it was distinct. The colourless sub- 

 trigonal shells were regarded by Mr. Ueeve as a separate species ; 

 but he did not allude to them in his monograph. 



7. Levicardium apicinum. 



L. testa subtrigona, parva, tenuissima, nitidissima, subcompressa, 

 epidermide tenui induta ; radiis seu striis radiantibus nuUis ; striis 

 concentricis satis regularibus, subobsoletis, t. jun. magis extanti- 

 bus ; umbonibus angustis, parum incurvatis ; margine ventrali 

 satis excurvato, antico parum producto, postico subtruncato, 

 dorsalibus obtuse angulatis ; colore valde variante ; plerumque 

 pallida viridi-cinereo, rufo-fusco seu angulatim tseniato seu macu- 

 late seu punctato ; regione umbonali plerumque pallida, interdum 

 rufo-fusca seu aurantiaca ; parte postica baud intensiore : intus 

 plerumque citrina, hepatico varie penicillata : dent. card, et lat. 

 acutis, tenuibus ; margine minutissime subobsoletim crenulato. 

 Long. -55, lat. '5, alt. -3 poll. 



Variat t. latiore. Variat quoque colore fere omnino hepatico, seu 

 cameo, seu pallide aurantiaco, seu pallide cinereo, seu albido : 

 rarissime ut in Tapete fuscolineata ornata. 



8. Lucina lingualis. 



L. testa solida, hnguiformi, valde prolongata ; plerumque aurantiaco- 

 carnea, intus intensiore ; lirulis concentricis obtusis crebre ornata ; 

 marginibus undique excurvatis ; lunula minima, altissime excavata; 

 parte postica obscure biangulata, seu subrotundata ; umbonibus 

 anticis, incurvatis; ligamento subinterno, lamina valida ; dent, 

 card, et lat. normalibus, vahdis ; cicatr. adduct. posticis subovali- 

 bus, anticis satis elongatis ; linea pallii lata, rugosa ; margine in- 

 terno crenulato. Long. -88, lat. '92, alt. "4 poll. 



Variat t. minus prolongata. Variat quoque t. pallide viridi, seu pal- 

 lide carnea, seu alba. 



9. tCrenella inflata. 



1C. testa valde inflata, minuta, albida, subrhomboideo-orbiculari ; 

 diagonaliter parum producta ; marginibus subquadrangulatim ro- 

 tundatis ; umbonibus prominentibus, valde antice intortis ; tota 

 superficie ut in C. decussata sculpta, costulis crebris radiantibus 

 sequidistantibus, hie et illic aliis intercalatis ; lirulis concen- 

 tricis decussantibus : intus margine dorsali brevissimo, arcuato, 

 dentate ; ligamento curtissimo, in fossa omnino interna, celata, la- 

 mina definiente, sito ; lamina cardinali sub umbonibus intus por- 

 recta, dentibus validis instructa ; marginibus internis omnino crc- 

 natis ; cicatr. adduct. subrequalibus, ventraliter sitis. Long. *!, 

 lat. -12, alt. -09 poll. 



Located provisionally in Crenella from its likeness to C. de- 

 cussata, but with peculiarities of hinge and adductors which 

 approach Nuculina on one side and Cardilia on another. 



Ann.S^ Mag. N, Hist. Sei-.3. Fo/.xiii. 21 



