BiiUidae. — Iviagkulidae. 191 



tello (Pantanelli) ; Civitavecchia (Monterosato) ; Napoli (Scacchi, Delle Chiaje, 

 Staz. zool.) ; Sicilia (PHiLim, Aradas et Benoit), Messina (Caxtraine) ; Malta, 

 Tunis (McAxdkew); Taranto (Salis); Adria : Ancona (Cantraine), Trieste, Lussin, 

 Lesina, Lag"osta (Stossich), Zara (Sandri, Cantraine); mare Aegeum (Forres). 



ni 2. H. elegans Leach {BuJla FoUicuhis Mke. , Wkff., B. hydatis var. 

 minor Monter.). Testa ovato-subcylindrica, ventricosa, saepe subtruncata, tenuis, 

 fragilis, nitidiuscula, albida, striis incrementi tantum sculpta, supra punctiformi 

 umbilicata; apertura elongata, infra subdilatata, labro rogulariter curvato, supra 

 deflexo, labium supra subexpansum, adnatum, infra fere rectum, reflexiusculum, 

 subincrassatum, ad terminum vix oblique truncatum. — Long. 12, lat. 8 mm. 



Habit. : Gibraltar, ]\Iahon (Hidalgo); Alger (Weinkauff). 



3. H. subpellucida H. Ad. Testa tenuissima, albida, subpelhicida, ovata, 

 medio plerumque gibbosa, longitudinaliter striis undulatis rugosis et spiraliter 

 lineis elevatis irreguhiribus sculpta; vertice excavato, subperforato ; apertura antice 

 dilatata; margo columenaris siraplex, arcuatus, labrum rectum, post rotundatum. — 

 Long. 17, lat. 11 mm. 



Distrib. : Mare hisitanicum, Lisboa. 



Habit. : „Mediterraneuni et Adriaticum" (Monterosato). 



Acera 0. F. MtJLL. Animal non omnino retractile; discus cephalicus longiis, 

 angnstus, ante truncatus, post attenuatus; ocidi laterales; epipodia magna, siipra 

 tesfam reflexa et sese tangentia; mandihidae disiinctac, retiadatae, raduhi doitibus 

 valde numerosis ; ventriculus laminis corneis nmnifus; tesfa exferna, imperforafa, in- 

 voluta, tenuis, fragilis, cornea, pellucida, epidermide xyraedita, ci/Iindrico-gtohidosa ; 

 spira distincta, invohda, apertura ad apicem inciso-emarginafa, columella acuta. 



1. A. bullata Mull. (BuIIa agera Gm., B. solufa Salis, B. fragilis Lam., 

 B. Hanlegi Ad. , B. elastica Sandri, B. canalicidafa Olivi, A. tenuis Bkus., 

 A. elegans Loc). Testa tenuissima, fragilis, albida, epidermide tenui fusco-hitea 

 tecta, vertice truncato, anfr. .3 — 4 angulato-carinati, sutura profunda canaliculata 

 divisi, ultimo totaiii longitudinem testae aequante, medio leviter dilatato, basin 

 versus sensim paullo attenuato et late rotundato; labrum ext. ad spiram pro- 

 funde sinuatum, cohimena tenuis, aequaliter incurvata. — Alt. 28 mm. 



D i s t r i b. : Atlanticum. 



Habit.: Litora Galliae (Martin), Marseille (VAYssif:RE), la Joliette (Marion) ; 

 Kizza (VfiRANY); Genova (Jeffreys); Spezia (Tapparone-Canefri) ; Sardinia: 

 Cagliari, Etruria: Livorno (Cantraine); Adria: Trieste (Sars, Stossich), Zara 

 (Sandri); mare Aegeum (Forbes). 



CylindrobuUa Fischer. Animal omnino retractile; testa cylindrica, tenuis, 

 fragUis, spira pcrhrecis, sutura incisa; margo cdlumellaris retro elongafiis et spirani 

 tege)is, margo externus regioni coIiimeUari apjjroximafus et aperturam excepta parte 

 anteriore occlndens. 



1. C. fragilis Wkff. (Cglichna fragilis Jeffr.). „Testa cylindrica, niti- 

 dissima, liyalina, ad apicem constricta et longitudinaliter striatula, aliter laevissima; 

 spira laxe invohita ; vertice paruni conspicuo, oblique attenuato ; apertura superne 

 angusta, infra dilatata, truncata" (Jeffreys). — Long. V'i5, lat. Vso poll. angl. 



Distrib. : Atlanticum, Madeira. 



Habit. : Cartagena (McAndrevv, testa Weinkauff); Spezia (Jeffreys). 



5. Fam. RINGICULIDAE Fischer. Animal retractile; discus cephalicus 

 post in formani siphonis productus; radula pauciseriata; testa brevis, ventricosa, 



