202 Gastropoda. — Pomatobranchia. Gymnobranchia. 



1. Umbrella mediterranea Lam. (? U. Lamarcldana EficL.). Pallium albi- 

 dum, marginihus leviter anrantiacis; pes infra et in parte tuberculosa dorso-laterali 

 laete aurantiacus, apice tuberculonun albido; epidermis mucosa fusca; testa lactea, 

 epidermide flavida supra tecta, infra margine pallide flavo, in centro brunnea. — 

 Lonig. 30 — 80 mm. 



Distrib. : Atlanticum (ins. promont. virid.). — Fossilis tertiaria Italiae. 



Habit.: Barcelona, Mataro (Hidalgo); Conejera (McAxdrew), Palma de 

 Mallorca (Aucapitaixe); Port Vendres (Bucquoy, Dautzenberg, D(jllfus), litora 

 Provinciae (Petit), Agde (RAcluz, Petit), Marseille (Marion, VAYssif;RE), Toulon 

 (Locard), le Var (Petit, Doublier); Nizza (Risso, Verany), litora pedemontana 

 (Jeffreys); Corsica (Payraudeau, R£quien); Sardinia: Bonifacio (Rolle); Napoli 

 (Scacchi); Sicilia, Palermo (Philippi, Cantraine); Adria: Lesina, Zara (Brusina). 



Tylodina Rafin. Animal ('Jon(/afum, fere omnino suh tcsfam rcfractile; cajnct 

 ante imjfundc cmar<jinatum; rhinophoria involuta, latere externo Jisso, inftis lamellis 

 otfactoriis; pes ovalis, marginibus superis laevibus, crassus; tentacida oralia magna; 

 tcsta conica, depressa, orata, apice subcentrali, impressione muscidari confinua, mar- 

 ginihus foliaceis. memhranaceis. 



1. T. citrina Joann. (T. puncfafa Raf., T. Bafincsquii Phil., Farmopliorus 

 patelloidcus, postea Umhreda pcdeJloidea Cantr.). Animal flavo-citrinum , in dorso 

 pedis fasciis nonnullis paullo distinctioribus, branchia straminea; radula 80 — 130. 

 1. 130 — 80; ventriculus denticulis corueis numerosis armatus, testa conica, flavo- 

 straminea, fasciis ab apice radiantibus 12 — 20 fuscis epidermidis. — Long. 15 mm. 



Distrib. : Atlanticum. — Fossilis tertiaria Italiae, Siciliae. 



Habit. : Alger (Weinkauff); Marseille (VayssiJ^re) ; Corsica (RfiQuiEN); 

 Sardinia (Cantraine); Spezia (Tapparone-Canefri); Civitavecchia (Monterosato); 

 Napoli (Staz. zoolog.), Sicilia (Joannis, Cantraine), Catania (Philippi); Adria: 

 Cherso (Gruke), Zara (Sandri, Brusina). 



2. Subordo. Gymnobranchia Schweiqg. 



1. Tribus. Protocochlides v. Iher. 



Systenia nervosum centrale e massa simplici dorsali constans, cum aut sine 

 commissura simplici pharyngea; oculi et otocystae faciei superiori massae gan- 

 glionaris incumbentes; bulbus oralis et radula nulla; branchiae arborescentes dor- 

 sales aut nulUie; testa nuna. 



(1. Fam. RHODOPIDAE v. Iher. Commissura pharyngea nuUa; branchiae 

 nuUae; cutis epithelio vibratili tecta; tentacula nulla; orittcia geuitalia dextra, 

 i peni praeditum. 



Rhodope KOll. Corpus vermiforme, supra eonvexum, infra plamim, pallio 

 indistinito, (tpj)cndicihus dorsalihus mdlis. 



m 1. Rh. Veranyi Koll. {Sidonia clegans M. Schultze). Corpus 4 mm 

 long., 3,3 mm hitum. medio latericium. 



Distrib. : Athmticum (Madeira). 



Habit. : Napoli (Metschnikoff, Kowalevsky, Trinchese), Messina (KOl- 

 liker); Adria: Trieste (M. Schultze, v. Graff), Muggia (v. Marenzeller). 



Evolutio lihodopae a cl. Trinchese observata eam vermem esse demonstrat.) 



2. Fam. TETHYDIDAE (Gkay), B(in., v. Liek. Corpus elongatum, os 

 magnum, caput latum, disci speciem referens, rliinophoria perfoliata, vagina pro- 

 tecta; appendices dorsales uniseriatae; commissura pharyngea; branchiae dorsales 

 ramosae. 



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