collected at Cape St. Lucas. . 313 
Mr. Cuming’s assertion that it was distinct. The colourless sub- 
trigonal shells were regarded by Mr. Reeve as a separate species ; 
but he did not allude to them in his monograph. 
7. Levicardium apicinum. 
I. testa subtrigona, parva, tenuissima, nitidissima, subcompressa, 
epidermide tenui induta ; radiis seu striis radiantibus nullis ; striis 
concentricis satis regularibus, subobsoletis, t. jun. magis extanti- 
bus ; umbonibus ancustis, parum incurvatis ; margine ventrali 
satis excurvato, antico parum producto, postico subtruncato, 
dorsalibus obtuse angulatis: colore valde variante; plerumque 
pallide viridi-cinereo, rufo-fusco seu angulatim tzeniato seu macu- 
lato seu punctato; regione umbonali plerumque pallida, interdum 
rufo-fusca seu aurantiaca; parte postica haud intensiore: intus 
plerumque citrina, hepatico varie penicillata: dent. card. et lat. 
acutis, tenuibus; margine minutissime subobsoletim crenulato. 
Long. °55, lat. *d, alt. °3 poll. 
Variat t. latiore. Variat quoque colore fere omnino hepatico, seu 
carneo, seu pallide aurantiaco, seu pallide cinereo, seu albido: 
rarissime ut in T'apete fuscolineata ornata. - 
8. Lucina lingualis. 
L. testa solida, linguiformi, 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, validis ; 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. ?Crenella inflata. 
?C. 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 
zequidistantibus, hic et illic aliis intercalatis; lirulis concen- 
tricis decussantibus: intus margine dorsali brevissimo, arcuato, 
dentato ; ligamento curtissimo, in fossa omnino interna, celata, la- 
mina definiente, sito; lamina cardinali sub umbonibus intus por- 
recta, dentibus validis instructa; marginibus internis omnino cre- 
natis ; cicatr. adduct. subzequalibus, ventraliter sitis. Long. °l, 
lat. °12, alt. -09 poll. 
Located provisionally in Crenella from its likeness to C. de- 
eussata, but with peculiarities of hinge and adductors which 
approach Nuculina on one side and Cardilia on another. 
Ann. & Mag. N. Hist. Ser.3. Vol. xiii. 21 
