188 Pelecypoda. — Arcacea. 



iimbone ad angulum posticum ventralem decurrente obtusissima, subobsoleta munita, 

 margine ventrali liaud sinuato, striis radiantibus (postice altioribus) et concentricis 

 aequidistantibus elevatis granulato-decussata, lacteo-albida, epidermide pilosa pal- 

 lide fusca ; area oblongo-lanceolata, medio fusca, transversim striata, inter umbones 

 recurvatos profundata; margo integerrimus. — Long. ad 15, alt. ad 9 mm. 



Distrib. : Atlanticum, mare rubrum. — Fossilis in stratis tertiariis. 



Habit. : Litora Hispaniae (McAndrew), Gibraltar (McAndrbw), Cartagena, 

 Valencia , Mataro , Barcelona (Hidalgo) ; ins. balear. : Iviza , Palma (Hidalgo) ; 

 litora Galliae (Petit, Dup.keuil), Roussillon (Locaed), fort Brescou (Dubbeuil), 

 Cette (Gkangeb), Palavas (Dollfus), Aigues-Mortes (ClSment), Marseille (Ancey, 

 Mabion), Toulon, St. Tropez, St. Eaphael, St. Nazaire (Doublieb, Gtay), Porque- 

 rolles (Locakd), Cannes (Dautzexbebg) ; Nizza (Risso, V:fiRANY); litora pede- 

 montana (Jeffbeys); Corsica (Paybaudeau, Requien); Sardinia: Bonifacio (Rolle); 

 Spezia (Tappabone-Canefbi) ; Livorno, Castiglioncello, is. Gigiio, Pianosa (Appe- 

 lius); Ustica (Calcaba); Sicilia (P?iilippi), Messina (Seguenza), Sciacca (Monte- 

 kosato) ; „Adventure Bank" (Jeffbeys) ; Pantellaria (McAndbewJ; litora Tune- 

 tana (McAndrew); Adria (Sandri), Venezia (v. Martens), Lussin (Grube), 

 Levrera, Ossero, Lagosta, Lesina, Curzola (Helleb) ; Morea (Deshayes, Fobbes) ; 

 mare Aegeum (Jeffbeys), Serplio Pulo, Amorgo, Milo, Asia minor, prom. Crio 

 (Fobbes). 



4. Arca barbata L. {Barhatia harhata Beus.). Testa oblonga, compressa, 

 ambitu pervariabili, utrinque rotundata aut angulata, ad marginem ventraleni plus 

 minusve sinuata, decussatim striata, striis longitudinalibus granulatis, epidermide 

 barbata tecta ; umbones ad ^/.t aut ^ji longitudinis siti , apicibus approximatis, 

 area elongata, angusta. — Long. 50 — ()0 mm. 



Distrib. : Atlanticnra, lusitanicum. — Fossilis in stratis tertiariis. 



Habit. : 2 — 10 org. prof. ; Gibraltar (Jeffeeys); litora Hispaniae : Carta- 

 gena, cabo de Palos, Valencia, Mataro (Hidalgo) ; ins. balear. : Malion, Iviza, 

 Cabrera, Palma, Andraitx (Hidalgo), Conejera (Mc Andbew) ; Alger (Mc Andbew, 

 Weinkauff) ; litora Galliae (Dubbeuil), Roussillon (Locaed), Cette (Gbanger), 

 Palavas (Dollfus), Aigues-Mortes (Clement), Fos, les Martigues (Locabd), Mar- 

 seille (Ancey), fort St. Jean, Pomegue, Roucas-Blanc, Morgillet (Mabion), Toulon, 

 St. Tropez , St, Raphael (Doublieb , Gay) , St. Nazaire , PorqueroUes (Locabd), 

 Cannes (Dautzenberg) ; Mentone (Locaed), Nizza (Risso, V:fiRANY); litora pede- 

 montana (Jeffeeys) ; Corsica (Paybaudeau, Requien) ; Sardinia : Bonifacio (Rolle), 

 Cabrera (McAndbew); Spezia (Tappabone-Canefei); Livorno, ins. Elba (Appelius); 

 Napoli (ScAccHi, McAndbew); Sicilia (Philippi, Aradas et Benoit) ; Ustica 

 (Calcara) ; mare Tunetanum (Monterosato) ; Taranto (Salis) ; Adria : iu fundis 

 saxosis partis occidentalis (G. v. Mabtens), Venezia (Wbinkauff), Trieste (Grube), 

 Cherso, Lussin, Lagosta, Lesina, Curzola, Ragusa (Heller, Brusina) , Pirano, 

 Cephalonia (v. Martens), Zara (Sandri) ; Morea (Deshayes), sin. Cervi (Forbes) ; 

 mare Aegeum, prom. Crio, Asia min. (Fobbes); Aegyptus: Alexandria (Hartmann), 

 Ramleh (Schneideb). 



Nom. vulg. : Venezia, Istria: Cofani del dui-o (G. v. Martens) 



5. A. diluvii Lam. {A. antiqitata Poli, nec L., A. Polii Mayer, A. corhu- 

 hides Monter., A. tatecostata Nyst). Testa ovato-rhombea, oblique cordata, ventri- 

 cosa, antice brevissiina, postice oblique truncata, sub epidermide pilosa rufa lactea, 

 costis 27 valde convexis transverse striatis sculpta ; margo dorsalis rectus, ven- 

 tralis valde arcuatus, angulo antico rotundato ; umbones valde recurvati, distantes, 

 area lineari oblonga ; cardo rectus, dentibus numerosis aequalibus , sed postremis 



