Unguliuidae. — Douacidae. 133 



Donax L. Si^iho analis branchiaU longior cf angnstior; orifimm apparatus 

 hyssogoni niinimum, bi/sso nnUo; fesfa cunciformis, acqniraJris, inacquilafcra, solidula, 

 iacviuscula ; cardo dcnfibns auf in utraquc valra binis auf in alfcra singulo auf tcr- 

 itis, laferalibus 1—J2 subremofis; ligamcnfum, extermmi, breve, posiiciim. 



1. D. trunculus (L.) Lam. (Scmda trunculus Monter., D. brcvis Utqu.y 

 J). rhomboidrs Eissu, var. atlantica: T). anafinus Lam.). Testa transverse oblonga, 

 laevis , snbtilissime striatnla , valde inaequilatera , parte postica vix ^/4 totius 

 longitudinis aequante, fulva, lineis radiantibus pallidioribus, interdum violaceo 

 zonata, intus plerumque violacea, margine crenulato; sinus pallialis semiovatus, 

 magnus; angulus mediocris, acutus; cardo utrinque dentibus 2 alternis bitidis, late- 

 ralibus nullis. — Long. 35 mm. 



Distrib.: Atlanticum, ad Magnam Britanniam et at flumen Senegal; Pontus. 

 — Fossilis in stratis tertiariis. 



Habit. : — 45 org. prof. ; litora Hispaniae : Algesiras (Hidalgo), Gibraltar 

 (McAndkew, Jeffkeys), Malaga (McAndrew, Rosenhauer, Jeffreys, Hidalgo), 

 Yalencia, Cartagena (McAndrew), Benicarlo, Sitjes, Barcelona, Rosas (Hidalgo), 

 Barcelona (Lacaze-Duthiers) ; ins. balear.: Palma, Mahon (Hidalgo); Alger (Wein- 

 kauff), Benzert (Jeffkeys), Cap Falcon, Bone, Azew, Alger, Oran, Cherchel, Habibas 

 (Deshayes); litora Galliae (Petit, Dubreuil), fort Brescou, Agde (Dubreuil), Rous- 

 sillon, Cette, Palavas, Marseille, Toulon, St. Nazaire, Cap Sicie, Mentone (Locard); 

 Kizza (Risso); litora pedemontana (Jeffreys); Corsica (Payraudeau, RfiQUiEN); 

 Sardinia: Bonifacio (Rolle); Spezia (Tapparone-Canefri) ; mare Etruscum (Appe- 

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

 Tunis (Mc Andrew); Taranto (Salis); Adria: Venezia (G. v. Martens), Cherso 

 (Grube), Zara (Sandri), Curzoki (Heller), Rovigno, 28 m (Wimmer), litora 

 Istriaua frequ., litora Dalmatina, rar. (Stossich); Morea (Deshayes) ; mare Aegeum 

 (Forbes); Aegj^ptus (Savigny), Ramleh (Schneider). 



Nom. vulg. : Barcelona: Tellerinas (Hidalgo); Alger: Clonis (Weinkauff); 

 Oenova: frutti del niare (Jeffreys); Spezia: Calcinello (Capellini); Napoli: 

 Tunninola (0. G. Costa); Venezia: Cazzonello (G. v. Martens). 



D. adriaticus Monter. {D. anatinus Desh. nec Lam. sec. Monter.). Differt a 

 ti'nnculo lateie postico angulato nec truncato, niargine ventrali planato, arcuato, 

 sculptura distincta, radiata, epidermide umbones versus caduca; unicolor, radiis 

 nuUis, intus alba. — Habit. : Adria (Monterosato); Morea (Deshayes). — Pontus. 

 m D. Bellardii Tapp.-Can. Testa oblongo-cuneata , extra alba aut luteola 

 fulvo-radiata, intus omnino alba aut niaculis violaceis croceisque picta ; laevissiuia, 

 striis incrementi trausversis evanidis, tantillunique evidentioribus in latere postico 

 brevissimo, angulisque obsoletis cincto ; margine iucurvo in medio obsolete angulato, 

 crenulato. Lat. 12, alt. 8 mm. — Habit. : Spezia; Adria: Chioggia (Tappa- 

 rone-Canefri). — An var. (juv.) D. trunculi? 



2. D. semistriatus Poui {D. fabagclla Desh. , nec Lam., D. frifasciata 

 Risso). Testa transverse oblonga, ebngata, postice sat acute angulata, flava 

 aut fusca radiis binis albis, antice laevissima, medio striis transversis longitudi- 

 nalibusque decussata, margine crenulato; cardo dextra dente primario 1 bitido, 

 sinistra primariis 2 et laterali 1 antico. — Long. 23 mm. 



D i s t r i b. : Atlanticum ad ]\Iagnam Britanniam. — Fossilis iu stratis 

 tertiariis. 



Habit. : — 20 org. prof. ; litora Hispaniae: Algesiras (Hidal(;o), Gibraltar, 

 Malaga, Cartagena (McAndrew), Valencia, Peniscola, Benicarlo, liarcelona 

 (Hidaloo); ins. balear. : Mahon (McAndrew), Formentera, Palma, Foruells 

 (Hidalgo); Alger (Weinkauff), Mers-el-Kebir (Deshayes); litora Galliae (Petit, 

 Dubreuil), Agde (Petit), Palavas (Dollfus), Marseille (Ancky), le Prado (Marion), 



