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Tukt., Brown. — T. ovato-cordata, postico truncata,
subacqui-iatera, plicis 20— 28, margine tenui, intus laevi, epidermide
castanea; fj, cr. 8,5; cr. 9; 4|;{, cr. 6,9; 4|;f, cr. 5,3;
cr. 5; J;$, cr. 3 mm. — Var. rarius margine incrassato,
sed semper laevi. Praecedenti nimium affinis, sed distincta
latere postico latius truncato et, una cum ventrali, magis
compresso, margine lacvigato, tenui, et colore nonnihil laetiore.
Utraque lunulam praebet ovato-lanceolalam salis cavam, aream
duplo longiorem et ligamentum breve gracile, areae 4 nonnihil
superans. Color intus rubens, rarius albus. Boh. — Norv.
274. A. seraisulcata (Crassina) Leaco, Möll., (an Jkffr.?) = A.
gairensis Nichol, = C. ovata Brown, = C. elliptica Brown, = C.
sulcata Nilss. (non Mont.) — T. elliptica, inaequilatera, plicis 20—
25, margine laevigato, epidermide viridifusca; j$, cr. 11,3; 4W
cr. 7; cr. 4,6 mm. — T. compressa, postice longior;
umbones in £ antica siti; lunula ovato-lanceolata, sat profunda;
area duplo fere longior, lanceolata; ligamentum validiusculum j
areae long. xquans; margo lunularis modice sinuatus, arealis
dimidio fere longior, rectus; anticus rotundatus, posticus
truncatus, ventralis arcuatus; plicx rotundatae, concentrice tenue
striatae, antice et praesertim postice evanidae, in adultis ad
marginem ventralem saepe obsoletae. Color viridifuscus, in umbonibus
fulvescens, radiis nonnullis fuscis obsoletis; intus albus. Var.
magis minusve convexa, margine interdum incrassato, numquam
crenulato. Boh. — Finm.
275. A. corrugata (Crassina) Brown, = A. cypnnoides Duv., Wood
Hanl., = C. borealis Nilss., Phil. Abbild. (non L.) = Chemn.
VII, 412. — T. cordato-trigona, inaequilatera, postice longior,
concentrice obsolete plicata, f epidermide fibroso-striata, fusca;
cr. 17; )}, cr. 19; cr. 12’mm. — T. jam ventricosa,
jam subcompressa, solida; umbones ad £ an ter. siti; lunula
obo-vata 1. lanceolata, profunde excavata, obscure fusca; area
lanceolata impressa, ligamento valido prominulo duplo longior;
margo arealis longus, subrectus, in posticum fere absque angulo
continuatus; anticus postico amplior; plicae superne
distinguendae, at obsoletae, inferne evanidae; epidermis in umbonibus
tenuis, dein crassa, striata, striis fibroso-lamellosis, subsericis, ad
marginem creberrimis; testa crassa, fere ponderosa; limbus
internus a margine ad impressionem pallii consolidatus, planus.
Finm.
276. A. striata (Nicania) Lf.acu 1819, Möll., (non Sow. 1822),
(Crassina) Gray, WoodHanl., Nilss., Brown, = C. compressa
Tcry. (non Mont.), = A. multicostata ”Smith’*, Macg., PniL. =
A. pulchella Jon., Pdil. — T. rotundato-trigona, subaequilatera,
plicis linearibus regularibus 50 et ultra, epidermide luteo-fusca;
cr. 7; ’f/, cr. 5; J;f, cr. 4 mm. — Var. inter formam
rotundatam et trigonam, interdum elongata, saepe deformis,
incrassata, postice obtusa, aut compressa, aut ventricosa. Lu-
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