Neomeniidae. — Cliitonidae. 179 



B. Ischnoidea Carp. {Ckiton Fischer p.). Lamiiiae insertionis acutae, 

 laeves, lissuratae, subgrundis [prolongationibus strati superficialis valvarum], 

 manitae ; zona sine poris. 



Chiton (L.) FiscH. Tcsta plcrumque ovalis; lamiuac iuscrtionis vaJvac ccpha- 

 licae ct cnudulis similes, certo numcro fissurarum munitac. 



Subgen. Chiton (L., Fisch. p.) Moxter. {Ctathroplcura Tin., Lopht/rus Poli). 

 Zona tessellata, squamulis tecta ; valvae terminales dentatae, marginibus pectinatis, 

 intermediae fissura laterali. 



1. Ch. olivaceus Spglr. {Ch. squamosus Poli, Payr., al., Ch. siculus Gray, 

 Ch. sulcatus Risso , Cli. Polii Desh. , nec Phil. , Ch. zibinicus Doderl.). Testa 

 ovato-oblonga, dorso carinata, laevigata, coloribus variis picta; valvae terminales 

 radiatim sulcatae ; valvae intermediae areis mediis plerumque longitudinaliter (aut 

 arcuatim) sulcatis, areis lateralibus angustis, trausversim snlcatis; zona squamulosa.^ 



Distrib. : Atlanticum. — ■ Fossilis tertiaria species. 



H a b i t. : — 1 m prof. ; litora Hispaniae : Gibraltar, Cartagena (Mc Andrew), 

 Mataro (Hidalgo) ; ins. balear. : Pahna de Mallorca , Mahon (Hidalgo) ; Alger 

 (Weixkauff); litora Galliae (Pexit), Roussillon (Locard, Bucquoy, Dautzbnberg); 

 Palavas (Dollfus), Marseille (Ancey, Mariox), Toulon, St. Tropez (Doublier), 

 €annes (Monterosato) ; Nizza (Eisso) ; litora pedemontana (Jeffreys); Corsica 

 (Payraudeau, RfiQUiEx) ; Sardinia : Bonifacio (Rolle) ; Spezia (Tapparoxe-Canefri) ; 

 Livorno, Castiglioncello, Gigho (Appelius) ; Civitavecchia (Monterosato) ; NapoU 

 (ScAccHi); Sicilia (Philippi, Aradas et Benoit); PanteUaria (McAndrew); Adria: 

 Yenezia (G. v. Martens, Weinkauff), Trieste, Cherso, Neresine (Grube), Lesina, 

 Lissa, Curzola, Ragusa, Lagosta (Heller), Zara (Sandri); Morea (Deshayes) ; 

 mare Aegeum (Forbes) ; Aegyptus (Savigny). 



m 2. Ch. corallinus Risso {Gh. ruhicundus 0. G. Costa, Ch. scytodcrma 

 ScAccHi, Ch. pndchellus Phil., Ch. PhilippH Issel, ? Ch. rubcUus Nardo, ? Ch. ruber 

 Olivi, ex opin. Monteros., Ch. Freclandi Forb., ex opin. ejusd.). Testa valvis 

 carinatis, tenuissime lepidotis, areis mediis sulcis aliquot longitudinalibus grossis 

 exsculptis; zona squamulis majusculis horizontalibus. — Long. 10 — 15 mm, lat. 

 6 — 8 mm. 



Habit. : Mahou (Hidalgo); Morgillet, cap Cavaux, 35 m (Marion); Nizza 

 (Risso); Civitavecchia (Monterosato) ; Napoli (0. G. Costa, Philippi), Salerno 

 (Tiberi); Sicilia: prom. 8. Vito, Palermo (Monterosato) ; Adria: Dalmatia (Klecak). 



m 3. Ch. phaseolinus Monter. {Ch. coraUinus var. Monter. , antea). 

 Testa angusta, valvis obtusis, non carinatis, areis lateralibus et valvis extremis 

 non striatis sed concentrice rugosis, areis mediis longitudinaliter obsolete 2 — 3- 

 striatis; zona squamulis minutissimis snbimbricatis. — Long. 15 mm, lat. 7,5 mm. 



Habit. : Napoli (A. Costa); Palermo (Monterosato). 



Subgen. Lepidopleurus Risso {Trachydcrmon Carp., Craspedochilus G. 0. 

 Sabs, Ischnochiton Gray p., Holochifon Fischeb p.). Zona granulosa aut squamu- 

 losa; valvae marginibus non pectinatis. 



m 4. Ch. furtivus Monter. {Ch. riiber L., Tib., var. Monter. antea). Testa 

 ininuta, plana, hita, laevigata, areis lateralibus concentrice et subquadrate sculptis, 

 paulhim elevatis; zona tenui scabritie obtecta. • — ■ Long. 7,5 mm, lat. 4,5 mm. 



Habit. : Palermo, 20 — 30 m prof. (Monterosato). 



5. Ch. marginatus Penn. {Ch. cincrcus Forb. et H., Ch. variegatus Phil.). 

 Testa carinata, valvis sub lente minute granulosis; zona mediocri, tenuissime 

 granulata. 



D i s t r i b. : Atlanticum. 



12* 



