~ 412 — 



Arca britannica Eeeve Couch. icon. sp. 98. 

 ?Arca cardissa Lamarck VI p. 463. 

 Hab. e mediterraneo usque ad Britanniam. 



3. Arca lactea Linne. T. ovalis, postice oblique trun- 

 cata, antice rotundata, sat tumida, carina ex umbone ad angu- 

 lum posticum ventralem decurrente obtusissima subobsoleta 

 munita, margine ventrali haud sinuato, stiiis radiantibus et con- 

 centricis aequidistantibus elevatis granulato - decussata , striis 

 radiantibus postice eminentioribus, lacteo-alba, epidermide pilosa 

 pallide fusca tecta ; area oblongo-lanceolata, niedio fusca, trans- 

 versim striata, inter apices recurvatos profundata; margo integer- 

 rimus. — Long. ad 15, alt. ad 9 Mm. Philippi. 



?Arca lactea Liiine ed. 12 p. 114L — da Oosta Br. Conch. p. 171 

 T. 11, F. 5. - Lam. VI p. 467. — Philippi Enum. I p 57. - 

 Hanley Eec. Sh. I T 9, F. 24. — Eeeve Conch. icon. sp. 116. — 

 Forhes et Hanley II p. 23^ T. 46, F. 1-3. — Jeffreys Br. 

 Conch. II p. 177 T. 30, F. 5. - Weinkauit' Mittelm. p. 196. — 

 Sow. Hl. Ind. T. 8, F. 8. 9. — Hidalgo Esp. T. 69, F. 6. 7. - 

 Locard Cat. p. 480. 



Arca modiolus Poli Test. Sicil. II p 187 T. 25, F. 20. 21, an L.? 



Arca crinita Pulteney Cat. Dorset p. 35. 



Arca Quoyi Payraudeau Coq. Corse p. 62 T. 1, F. 40—43. 



Arca perforans Turton Dith. hr. p. 169 T. 13, F. 213. 

 Var. = Arca Gaimardi Payraudeau Corse p. 61 T. 1, F. 36 — 39. ~ 



Desh. Lam. VI p. 476. 

 Hab. e mediterraneo usque ad Britanniam. 



4. A r c a d i 1 u v i i L a m a r c k. T. o vato-rhombea, oblique 

 cordata, ventricosa, antice brevissima, postice oblique truncata, 

 sub epiderinide pilosa rufa lactea, costis 27 valde convexis 

 transverse striatis sculpta ; margo dorsalis rectus, ventralis valde 

 arcuatus, angulo antico rotundato; apices valde recurvati, di- 

 stantes, area lineari-oblonga ; cardo rectus, dentibus numerosis 

 aequalibus, sed postremis utrinque majoribus nninitus; margo 

 grosse crenato-dentatus. — Long. ad 57, alt. 49, crass. 56 Mm. 



Arca antiquata Poli Test. .^icil. II p. 146 T. 25, F. 14. 15, nec 



Linne. — Brocchi Conch. foss. suhapp. II p. 477. — Philippi 



Enum. I p. 59 T. 5, F. 2. 

 Arca diluvii Lam. VI p. 470. — Philippi Enum. II p. 43. - Wein- 



kauff Mittelm. p. 198. — Hidalgo Esp. T. 68, F. 1 - 4. — Locard 



Cat. p 478. 

 Arca Polii Mayer Cat. foss. Zlirich p. 75. — Monterosato Nuov. 



Eiv. p. 12. 

 Var. =■ Arca corbuloides Monterosato Euum. e Sin. p. 7. 



Hab. Mare mediterraneum. 



5. Arca scabra Poli. T. ovata, rliomboidea, fusca, 

 margine postico haud rectilineo sed convexo, epidermide fere 

 nulla, concentrice profunde sulcata, interstitiis elevatis, lineis 

 radiantibus decussato-nodulosis, nodulis postice grossioribus ; 

 umbones approximati; area linearis, angusta, paimn impressa. — 

 Long. 10, alt. 6 Mm. 



