96 Pelecypoda. — Arcacea. 



Habit. : 4 — 100 org. prof. ; litora Hispaniae: Gibraltar, Malaga, Carta- 

 gena (Mc Andkew), Valencia, Mataro (Hidalgo); ins. balear. : Mahon (McAndkew), 

 Cala Moli, Mahon (Hidalgo) ; Alger (Weinkauff, Monterosato), Bona, Benzert 

 (Jeffeeys); litora Galliae (Petit, Dubeeuil), Ag^de (Petit), Palavas (Dollfus), 

 Aigues-Mortes (Clement) , Marseille , Maire , Garlaban (Marion) , Toulon (Gay), 

 Porquerolles (Locaed) ; Nizza (Risso, V^ieany); litora pedemontana (Jepfeeys) ; 

 Spezia (Tappaeone-Canefri) ; Livorno , Castiglioncello (Appelius) ; Civitavecchia 

 (MoNTEEOSATo) ; Napoli (Poli, ScAccnr); Sicilia (Philippi, Aeadas et Benoit); 

 „Adventure Bank" (Jeffeeys); Pantellaria, Malta (McAndeew); litora Tunetana 

 (McAndeew, Jeffeeys); Adria: Venezia (G. v. Maetens), Trieste (Saes), Lesina 

 (RoEMEE, Hellee), Curzola (Heller), Capodistria. Cherso, Zara (Sandei, Bru- 

 sina); mare Aegeuin : sinus Cervi, Morea, Amorgo, Sumboli, Lj^cia, Smyrna (Forbes). 



3. Leda messanensis Seg. [Subgen. Junonia Seg. : Carina antica nuUa, 

 pars postica sinuosa, rostrata]. Siphones separati; testa subinaequilatera, postice 

 longior, margine postico utrinque declivi, convexiusculo, haud tenuis, semipellucida, 

 nitens, concentrice striata, angulo subliriformi ex umbone decurrente sculpta ; inter- 

 dum laevior; margo anticus rotundatus, posticus in rostrum acuminatum attenuatus 

 quasi compressus, ventralis fere semicircularis ; umbones minimi; cardo utrinque 

 dentibus 10 — 12 mimitus; facies interna polita, margine simplici, impressionibus 

 distinctis. — Long. 3,5, alt. 2,25 mm. 



Distrib. : Atlanticum, in abyssis. — Fossilis in stratis tertiariis 

 Habit. : 100 — 1750 org. prof. ; Marseille, Peyssonel (Marion); „Adventure 



Bank" (Jeffeeys); prof. 217 — 544 org. inter Sardiniam et Neapolim („Was- 



hington " , Giglioli) . 



4. L. frigida Jeffr. {Yoldia frigida Torell, Y. ruuia M. Saes) [Subgen. 

 Portlandia Mollee: Testa trapezoidea, truncata, postice latior, clausa]. Testa 

 breviter ovata, fere aequilatera, subcompressa, tenuis, sublaevis, epidermide luteo- 

 virescente nitida tecta, antice oblique rotundata, postice leviter producta, apice 

 obtuso, margine ventrali sat arcuato postice ascendente, distincte impresso, dor- 

 sali utrinque paullo expanso et compresso paullo declivi ; umbones parvi , paullo 

 prominuli, submediani; cardo utrinque dentibus 8 — 9. — Long. 5 mm. 



Distrib. : Arcticum; abyssi Atlaiitici. — Fossilis in stratis tertiariis et 

 posttertiariis. 



Habit. : Palermo, 210 org. (Monterosato). 



5. L. tenuis Jeffr. {Nucida tenuis Phil., N. pi/gmaea Phil., L. piigmaea 

 F. et H. , Jeffk. antea, N. nitida Scacchi, nec Brocchi) [Subgen. FortJnndia]. 

 Testa ovato-trigona, modice convexa, utrinque producta, tenuis, laevissima, epi- 

 dermide luteo-virescente tenuissima obtecta ; margo anterior brevis, posterior ob- 

 tuse acurainatus, ventralis sat arcuatus, dorsalis utrinque declivis ; umbones pro- 

 minuli, antemediani; cardo dentibus utrinque 14. — Long. 5 mm. 



Distrib. : Atlanticum usque ad Norvegiam. — Fossilis in stratis tertiariis 

 et posttertiariis. 



Habit. : 10 — 650 org. prof.; Cartagena, Benzert, „Adyenture Bank" (Jeff- 

 reys) ; litora Galliae : fort Brescou (Dubreuil) ; Napoli (Scacchi) ; Sicilia : prora. 

 S. Vito (Monterosato) ; mare Aegeum (Speatt, Jeffeeys). 



6. L. striolata Brugn. {Yoldia aI>//ssicola Seg. , nec Toe., Y. producta 

 Montee.) [Subgen. Portlandia]. Diftert a L. lcnticida Mollee (specie arctica: 

 testa oblongo-ovata, valde inflata, tenui, laevissiraa) testa magis planata, antice 

 cuneiformiter attenuata, concentrice striata, striis regularibus interdum nuraerosis, 

 interdum distantibus; epidermis luteo-virescens. — Magnitudo? 



