— 194 
dice convexa, angulo dorsali valde obtuso, margine ventrali ar- 
cuato, laminis parum numerosis (18 — 20) medio appressis, utrin- 
que liberis ? tenuibus, postice angulato-recurvis; T |jk, er. 5, 
2 mm. Kullen Finm. 
289. Y. ovata Penn., Mont., Lamk., = Y. radiata Brocchi, Phil. , = 
Y. pectinula Lamk. = V. spadicea ”Ren.’’ Nyst. Kullen — Finm. 
290. V. undata Penn., Mont., Phil., (Lucina) Lamk., Turt., Brown, 
(Gytherea) Mach., (Artemis) Recl. Boh. — Finm. 
291. V. virago n., = Y. virginea Angl., [non L.); an = V. 
virginea var. latere antico attenuato-elongato Turt. Biv. 156?; 
an = Y. florida Lamk.? — T. crassiuscula, modice convexa, 
elliptica; umbones ad | anticam siti, parvi, parum tumidi; mar- 
go dorsalis posticus modice arcuatus, angulum obsoletum prse- 
bens, pone ligamentum utrinque in carinam obtusam elevatus, 
cum margine ventrali sub angulo subacuto rotundato confluens; 
margo anterior subrectus; lunula cordato-lanceolata, vix impres- 
sa; sulci concentrici lineares, reguläres, passim leviter undati, 
postice profundius exarati, juxta marginem ventralem crebri, 
irreguläres. Dent.es divergentes, extimis angulum rectum 1. sub- 
obtusum formantibus; in valva sin. rnedius validus, bifidus, an- 
ticus compressus, prominulus, posticus tenuis, cultratus; in v. 
dextra rnedius et posticus bifidi, anticus compressus, cultratus. 
Sinus palliaris semiellipticus, lat. ad long. =■ 1 : 1,8, medium 
testoe non attingens; angulus acutissimus. Colore var. a) alba 
lineolis rufis fulguratis, in radios tres interruptos congestis; ß) 
roseo-alba, rufo punctata, radiis quatuor angustis albis spadiceo 
maculatis. Lunula in utraque rufa, area ad medium ligamenti 
utrinque macula angulata spadicea, umbones unicolores, rosei, 
apicibus flavis; er. 28; er. 22 mm. — Forma inter V. 
Deshaysii Hanl. 16,35 = Chemn. VII, 439 a Turt. citatam, et 
Chemn. YII, 443 (= V. texturata Lamk. etc.) a Mont, citatam 
fere intermedia. (Sars, Koren dd.) Norv. 
292. V. aurea Gm, Mont., Turt., Lamk., Phil. = Y. Jiterata L. F. 
S. [non S. N.) Boh. — Norv. 
293. Y. pullastra Mont., Turt., Lamk. (Venerupis) Flmg. 
Boh. — Finm. 
Saxicava Fl. de Bell. 
294. S. rugosa (Mytilus) L., Mont., Don., Turt., Lamk. = Myt. 
pholadis L., Muell , (Saxicava) Lamk., Desh., Turt. = Mya bys- 
sifera 0. Fabr. — S. distorta ”Say,” Gould. — Cardo plerum- 
que edentulus, nymphse intus tumidee. Kullen — Finm. 
295. S. arctica (Mya) L., Muell., 0. Fabr., (Cardita) Brug., (Hia- 
tella Daud.) Lamk., (Anatina) Turt. (d. card. v. d. fracto?) = 
Chama aculeata Ström = ”Donax rhomboides Poli” (Saxicava) 
Desh. = S. distorta ”Say” Gould. — a) Antice oblique trun- 
