Arcidae. gg 



ntnnqiip majoribus: niargo grosse crenato-dontatns. — Lonp. ad 57 nun, alt. 41>, 

 crass. ;■)<) nnn. — Var. inflato-globulosa et elono-ato-depressa (Ak.\das|. 



Distrib. : Propontis. — - Fossilis in stratis tertiariis. 



Habit. : Gibraltar (McAndrew); litora Hispaniae, Sitjes (Hidalgo); Alger 

 (AcTON, TiBERi, Weinkauff), Benzert , Bona , Rasel Anuisli (Jeffreys); litora 

 Oalliae (Petit, DirnBEUiL), Aigues-Mortes (Cli^ment), Poniegue, Montredon, Maire 

 (Marion), Camarat (Durkeuil); Nizza (Risso) ; litora pedeniontana (Jeffreys); 

 €orsica : Favona (Payraudeau); Spezia (Tai>i>arone-Canefri); Civitaveccliia 

 (Monterosato) ; Napoli (Scacchi , Poli) ; Sicilia (Philippi , Aradas et Benoit, 

 De Gregobio), Palenno (Monterosato), Sciacca (Del Prete) ; Malta, litora Tune- 

 tana (McAndkew): Taranto (Salis); Morea (Deshayes), mare Aegeuni, rar. (Forbes). 



m 6. A. saccata Poli (Barbafia scahra Brus. , A. nodulosa 0. F. Mull. 

 var. , ex opin. Jefkr.). Testa ovata. rhomboidea, fusca, margine postico luiud 

 rectilineo sed convexo, epidermide fere nulla, concentrice profunde sulcata, inter- 

 stitiis elevatis, lineis radiantibus decussato-nodulosis, nodulis postice grossioribus; 

 iimbones approximati; area linearis, angusta, paullo impressa. — Long. 10, 

 alt. 6 mm. 



Habit. : lu aqua profunda coralliis aftixa : litora Hispaniae : Garral [Barce- 

 lona] (Hidalgo) ; litora Galliae (Dubkeuil), Provinciae (Petit), j\Iarsilli, Peys- 

 sonel (Marion) ; Corsica (Requien) ; Napoli (Scacchi) ; Sicilia (Philippi, Aradas 

 ■et Benoit, rar.), Sciacca (Monterosato), Messina (Seguenza) ; Adria : Dalmazia 

 (Brusina) ; mare Aegeum: Naxia, Milo (Forbes). 



7. A. nodulosa (). F. Mull. Testa niodice convexa, ante mediuni leviter 

 constricta, oblonga aut oblique subrlioniboidea, duplo longior quam latior, valde 

 inaequilatera, antice angustata et breviter rotundata, postice dilatata et oblique 

 truncata , margine ventrali obliquo medio leviter inflexo , dorsali recto utrinque 

 distincte angulato, angulo posteriore sat prominente et compresso, urabones in V* 

 anteriore siti, magni, tumidi, area subrhomboidea ; valvae solidulae, noduloso- 

 decussatae , epidermide fusca margines versus squamoso-lacera tectae ; denticuli 

 •cardinales lamellosi, obliqui, antici circ. 7, postici circ. 13. — Long. 15 mm (Sars). 



D i s t r i b. : Atlanticura boreale. 



Habit. : Litora Marrocana (Jeffbeys); „Adventure Bank" (Jeffbeys); 

 ?litora Galliae (Dubreuil, noraen speciei Michelinio tribuit) ; Adria : in saxis 

 tufosis , Venezia (G. v. Mabtens) , Trieste (Stossich) , Cherso , Unie (Bbusina) ; 

 mare Aegeuni (Forbes). 



m 8. A. imbricata Poli [A. dathrata Defr. , Lam. , A. pukhdla Reeve, 

 MoNTER.). Testa ovato-oblonga, postice oblique truncata, angulata, albida, squaniis 

 irabricatis approximatis per series concentricas regulariter dispositis , marginem 

 ventralem versus apertis peculiariter sculpta ; umbones approximati ; cardo dentibus 

 paucis, lateralibus majoribus, intermediis fere obsoletis munitus ; margo duplex, 

 interior crenulatus, exterior a squaniaruni serie ultiraa forraatus. — Long. 12, 

 alt. H mm. 



Habit. : In aqua profunda coralliis aftixa : VAlger (Reeve); Marseille (Lo- 

 cabd) ; Nizza (Risso, Dubbkuil); Corsica (Rei^uien) ; Napoli (Scacihi) ; Ustica 

 (Calcaba) : Sicilia (Philippi, Abadas et Benoit), prora. S. ^'ito, Sciacca (Monte- 

 BosATo) , Messina (Seguenza); raare Aegeuni, Asia rainor: sin. Jlacri (Fobres). 

 — Fossilis in stiatis postpliocenicis Siciliae. 



9. A. obliqua Phil. (A. Koreni Danielss. , ex opin. Munter.). Testa 

 ovato-oblonga , transversa, valde inaequilatera , antice angustior, postice oblique 

 truncato-rotundata , striis exilil)us radiantibus, concentricisque irregularibus de- 



