Mytilidae. — Arcidae. 87 



Arca I^. Pes lonfjns, acitmiuatus, (fcnicuiafus, sukafus, hijssifcr; pallium aper- 

 fum occllifcrum ; branchiac lougae ohliquac ; palpi lahialcs ck>i>(/afi, antjusfi ; siphoncs 

 iiuUi ; fesfa acijuiiHilvis, suhrhomhoidca, crassa, vcnfricosa, cosfulafa auf rcficulafa, epi- 

 (lermide pilosa fccfa, maryinibus laecihus aut doifafis, clausis aut ad marfjinem ven- 

 tralem hiantibus; cardo directus Uhratus, dentibus numerosis brcvibus; umhones pro- 

 mincnfcs, prosoifi/ri. 



m 1. A. Noae L. Testa elongato-oblonga, latere antico brevissirao, acute 

 ane:iilato , postico compresso , emarginato ; carina obtusa al) umVione decurrente, 

 costis rudibus irregularibus, squamoso-rugosis, medianis anterioribus fere obsoletis; 

 area dorsalis latissima, plana, ligamento eam totam fere occupante, sulcis rhom- 

 boideis frequentissimis. Admodum variabilis. — Long. ad 90 mm. 



Habit. : Litora Hispaniae (McAndrew), Aguilas, Cartagena, Valencia (Hi- 

 DALGo); ins. balear. : Mahon, Palma de Mallorca (Lacaze-Di-tiiiers); Alger (Wein- 

 kauff), Benzert (Jeffrbys) ; litora Galliae (Petit), Roussillon (Locakd), Fron- 

 tignan (Dubbeuil), Cette (Granger), Palavas (Dollfus), Aigues-Mortes (CLftMENT) ; 

 Fos (Locard), Toulon, St. Tropez, St. Raphael (Dubreuil, Gay), St. Nazaire, 

 Porquerolles (Locard) , Nizza (Risso , V^rany) ; litora pedemontana ( Jeffreys) ; 

 Corsica, frequ. (Payraudeau, Requien), Sardinia (McAndrew); Spezia (Jeff- 

 REYs , Tapparone-Canefri) ; Livorno (AprELius) ; Napoli (Scacchi, Jeffreys); 

 Sicilia (Philippi, Aradas et Benoit) ; Malta (McAndkew, Jeffreys); Pantellaria 

 (McAndrew); litora Tunetana (McAndrew); Taranto (0. G. Costa); Adria: 

 frequ. (G. v. Martens, ubique, Stossich), Venezia (Weinkauff, Jeffrbys), Trieste 

 (Sars, Grube), Cherso, Lussin (Grube), Lesina, Curzola, Lagosta (Hbller), Zara 

 (Sandri) , Pirano (v. Martens) ; mare Aegeum , frequ. (Forbes) ; litora Aegypti 

 (Hart.mann, Fischer), Ramleh (Schnkider). 



Nom. vulg. : Hispanis : Peu de Cabrit (Hidalgo) ; Taranto: Cozza a jave- 

 tone (0, G. Costa); Venezia, Istria : Cofani de grotta (G. v. Martens) , Mus- 

 solo (PuucaR). 



2. A. tetragona Poli (^1. Noac Mtg., nec L., A. navicularis Desh., nec 

 Brucj. , Phil. , A. britannica Rekve). Testa oblonga , radiatim costato-striata, 

 concentrice regulariter (neque irreguhiriter squamose) striata, postice recta, carina 

 postica eminente, acuta, colore pallide rufo, haud maculato ; epidermis ad carinam 

 merabranam reguhiriter pectinatim fissam formans. — Long. 22 mm, alt. 10 mm, 

 area 20 mm longa, 7 — 9 mm hita. 



Distrib. : Athinticum. — Fossilis in stratis tertiariis. 



Habit. : 'M) — 80 org. prof. ; Gibraltar (McAndkew); litora Hispaniae: 

 Badalona, Mataro, San Pol (Hidalgo); ins. balear. (McAndrew), Conejera (Hi- 

 DALGo) ; Alger (McAndrew, AVeinkauff), Benzert, Rasel Amush (Jeffreys); 

 litora Galliae (Petit), Agde (Dubreuil), Marseille (Ancey), cap Cavaux, les 

 Goudes, Ratonneau, cap Pinede, Mejean , Riou, Peyssonel (Makion) , ha Seyue 

 (Locard) , Antibes, Port Miou (Dukkkuil); Nizza (Vekany, Dubkeuil); litora 

 pedemontana (Jeffreys); Corsica (Requikn, ?Payraudeau); Sardinia (McAndrkw); 

 Livorno, ins. Elba(AppELius); Civitavecchia(MoNTERosATo); Napoli(PoLi, Scacchi); 

 Sicilia (Philippi), Palerrao, Catania (Aradas), Palermo, Sciacca (Montebosato), 

 Messina (Seguenza); Malta, Pantellaria (McAndkew, Akadas); „Adventure Bank" 

 (Jeffreys); litora Tunetana (]\Ic Andkkw); Adria (Sandri); mare Aegeum: Morea, 

 Naxia (Forbes). 



3. A. lactea L. (^l. modiolus Poli, A. pcrforans Tukt. , A. Quoifi , Gai- 

 mardi Payr., A. harhata Penn., nec L., A. navicularis [Brucj.] Brus. , Helleb). 

 Testa ovalis , postice oblique truncata , antice rotundata , subtumida . carina ex 



