Paudoridae. — Lyonsiidae. 169 



Hal»it.: Mediterraneum lat. sept. 37*' 30', long. occ. (Greenw.) 6*^51', 

 14r)() orjr. innt'. ( ..Porcupine", Jeffrkys). 



2. P. granulata .Ikkkk. [VcrticoriVm nnmulafa Skg., V. mnUicostafa A. Ad.). 

 Testa tnniida, cordato-subtrianj;ula , costis radiantibus rotundatis 20, extra gra- 

 nulata, granulis rotundatis, propinquis, aequidistantibus ; niargo vix dentato-cre- 

 natns, denticulis minimis, obtusiusculis ; impressiones musculares anticae 2, postica 

 singula; lunula cordata, sine costis et granulis. — Long. 8 — 9 mm. 



Distrib. : Atlanticum, Caribaeuni, .Taponicum, in abj^ssis. — Fossilis mio- 

 cenica et pliocenica. 



Habit. : Palermo, „Adventure Bank'', in salo ante Tripolim, canalis Hj^dra 

 sin. Aegin. (Jkffkkys). 



3. P. insculpta Jeffr. {L//oiisia insculpfa Loc, Verticordia ecosfata S. W(jod). 

 Testa sitbglobosa , leviter quadrangula, tenuissima, semipellucida, nitens, costis 

 radiantibus subtilissimis circ. 25 sculpta, in interstitiis concentrice striata; alba, 

 epidermide membranacea; nmbones parvi, incurvi, vix prominuli; ossiculum oblique 

 contortum, post aequaliter furcatum. — Diam. o mm. 



Distrib. : Atlanticum in abyssis. — Fossilis tertiaria Siciliae. 



Habit. : In salo ante Jijeli (Jkfkkeys) ; Palermo, 162 org. (Monterosato). 



8. Fam. LYONSIIDAE Fischek. Margines pallii magna ex parte connati; 

 siphones sejuncti, orificiis iimbriatis; pes parvus byssifer; palpi trianguli; brancliiae 

 oblongae, sulco obliquo et canaliculato divisae; testa paullo inaequivalvis, oblonga, 

 tenuis, intus margaritacea ; cardo plerumque edentulus, sulcus submarginalis inter- 

 nus ligamentum et ossicnlum continens. 



Lyonsia Tikt. (Mandala Lkac h, Phil., Osfcodcsma Desh., Fandorina Scacchi). 

 Margo pallii papillosus; siphones brcres, analis vahida tuhulosa mnnitns; pes canali- 

 culafus, b/jsso midtifiU instructns; brancliia ohloncja; fcsta ehmgata, fenuis, marga- 

 rifacea, inaequivcdvis, subaequilafera leviter hians, post tnmcata; cardo edentidus, 

 idriiique focea ligamenfaU carfilagincm ct ossicidnm (lifliodesma) contincnfe obliqua 

 tnnnifus. 



1. L. norvegica Sow. (M>/a norvegica Che.mn., Amphidesma corhuloides 

 Lam., l*andora rosfrata Dan. et Sandri, Osfeodcsma corruscans Dan. et S., postea, 

 sec. Brusina). Testa valde inaequivalvis, oblonga, antice rotundata, postice sub- 

 rostrata et compressa , paullo supra cnrvata , apice truncato , margine ventrali 

 irregulariter arcuato, post saepius abrupte ascendente, dorsali utrinque paullo 

 declivi; umbones subtumidi, prominuli, panllo antemediani; valva sinistra major, 

 magis convexa, testa postice leviter hians, submembranacea, albido-flavescens, sub- 

 tiliter radiatim striata, epidermide tenui fibrosa, saepe arenulis obtecta, intus 

 nitidissima, iridescens. ■ — Long. 27 mm. 



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



Habit. : 2 — 162 org. prof. ; (L. norvegica saepe cnm L. corruscante con- 

 funditur; loci omnes certo indicari nequeunt). Barcelona, Mahon (Hidakgo); 

 Alger: Benzert, Bona, Rasel Amush (Jkffreys) ; litora Galliae (Di-brei:il), j^Iar- 

 seille: Ratonneau, Maire, Couronne, Garlaban, Riou, Montredon (Mariox), Por- 

 querolles (Locard). 



2. L. argentea Jkffk. Testa ovato-triquetra, solidula, opaca, lutescenti- 

 •albida, tuberculis subtilissimis ubique ornata , in valva dextra lineis nonnullis 

 radiantibus, in parte posteriore sinistrae costa radiante sculpta : uiargines ante 

 leviter curvati, ad oras tibrosi; umbones trianguli, leviter incurvati : lamina cardi- 

 nalis crassa; facies interna argentea. — Long. circ. 16 mm. 



