191 
/ 
Turt., Brown. — T. ovato-cordata, posticc truncata, subacqui- 
latera, plicis 20 
castanea; ff, er. 
1 0i9 r»r* £ • 7 1 2 
■j ^•g’ 3 
sed semper laevi. 
margine 
1 7 1 5 
TH) 7 
tenm, 
Q. 14^2 
^7 TT,T? 
Var. 
intus laevi, epidermide 
er. 6,9; ff’f, ^r. j 
margine incrassato, 
rarius 
-28, 
8,5; 4 ^, er. 
er. 3 mm 
Praecedenti nimium affinis, sed distincta la¬ 
tere postico latius truncato et, una cum ventrali, magis com- 
presso, margine laevigato, tenui, et colore nonnihil laetiore. Utra- 
que lunulam preebet ovato-lanceolatam satis covam, aream du- 
plo longiorem et ligamentum breve gracile, areae f nonnihil su- 
perans. Color intus rubens, rarius albus. Boh. — Norv. 
274. A. seraisulcata (Crassina) Leach, Moll., (an Jeffr.?) = A. 
gairensis Nichol, = C. ovata Brown, = C. elliptica Brown, = C. 
sulcata Nilss. (non Mont.) — T. elliptica, inaequilatera, plicis 20 — 
25, margine laevigato, epidermide viridifusca; ff, er. 11,3; ff;f 
er. 7; er. 4,6 mm. — T. compressa, postice longior; um- 
bones in f antica siti; lunula ovato-lanceolata, sat profunda; 
area duplo fere longior, lanceolata; ligamentum validiusculum | 
areae long. aequans; margo lunularis modice sinuatus, arealis di- 
midio fere longior, rectus; anticus rotundatus, posticus trunca- 
tus, ventralis arcuatus; plicae rotundatae, concentrice tenue stri- 
atae, antice et praesertim postice evanidae, in adultis ad margi- 
nem ventralem saepe obsoletae. Color viridifuscus, in umbonibus 
fulvescens, radiis nonnullis fuscis obsoletis; intus albus. Var. 
magis minusve convexa, margine interdum incrassato, numquam 
crenulato. Bob. — Finm. 
275. A. corrugata (Crassina) Brown, = A. cyprinoides Duv., Wood 
IIanl., = C. borealis Nilss., Phil. Abbild, (non L.) = Chemn. 
VII, 412. —• T. cordato-trigona, inaequilatera, postice longior, 
concentrice obsolete plicata, epidermide fibroso-striata, fusca; 
ff, er. 17; ff, er. 19; ff er. 12 mm. — T. jam ventricosa, 
jam subcompressa, solida; umbon-es ad f anter. siti; lunula obo- 
vata 1 . lanceolata, profunde excavata, obscure fusca; area lan¬ 
ceolata impressa, ligamento valido prominulo duplo longior; mar¬ 
go arealis longus, subrectus, in posticum fere absque angulo 
continuatus; anticus postico amplior; plicae super ne distingnen- 
dae, at obsoletae, inferne evanidae; epidermis in umbonibus te- 
nuis, dein crassa, striata, striis fibroso-lamellosis, subsericis, ad 
marginem creberrimis; testa crassa, fere ponderosa; limbus in¬ 
ternus a margine ad impressionem pallii consolidafus, planus. 
Finm. 
276. A. striata (Nicania) Leacii 1819, Möll. , (non Sow. 1822), 
(Crassina) Gray, WoodHanl., Nilss., Brown, = C. compressa 
Turt. (non Mont.), = A. multicostata ^SaIIth’’, Macg. , Phil. = 
A. pulchella Jon., Phil. — T. rotundato-trigona, subaequilatera, 
plicis linearibus regularibus 50 et ultra, epidermide luteo-fusca; 
tt, 3 4 7 cr * 7; 1 fir 7 cr * 5 7 lif 7 er. 4 mm. — Var. inter formam 
rotundatam et trigonam, interdum elongata, saepe deformis, 
incrassata, postice obtusa, aut compressa, aut ventricosa. Lu- 
