84 Pelecypoda. — Mytilacea. 



Habit.: Benicarlo, ad Valenciam, Vinaroz (Hidalgo); Alger, 152 org'. 

 prof. (JEFrEEYs). — ? Fossilis in stratis tertiariis Siciliae. 



Lithodomus Cuv. {Lithopliagus Mgle. v. Mhlp.). Animal mytUinum, pede 

 brevi hyssifero ; testa aequlvalvis, transversa, ohlonga, snbcylindrica, antice rotundata, 

 postice rostrata aut cunciformis, epidermide tecta, valde inaequilatera ; umbones antici, 

 paullum prominentes; margo cardinalis linearis, non dentatus, ligamentum marginale 

 internum,; stratum tenue internuni margaritaceum. 



1. L. lithophagus Payk. {Mytilus lithophagus L., Modiola lithophaga Lam., 

 L. dactylus Cuv., CaUitriche Uthodoma Poli, L. infiatus Requ.). Testa valde in- 

 flata , solida , subcylindrica , utrinque rotundata , postice latior ; striis incrementi 

 concentricis subtilibus , partem posticam versus fortioribus instructa ; basis fere 

 rectilinea ; dorsum medium paullulum fornicatum et carinatum ; umbones ab ex- 

 tremitate antica remotiunculi ; epidermis castanea, parte antica et dorso exceptis 

 striis directis insignita. — Long. 60 — 100 mm. 



Distrib. : Mare rubrum. — Fossilis in stratis tertiariis. 



Habit. : Litora Hispaniae: Cartagena, Santa Pola, Benicarlo, Barcelona 

 (HiDALGo); ins. balear. : Mahon (Paesons, McAndeew, Hidalgo), S. Antonio de 

 Iviza, Porto Pi, Fornells, Adaya (Hidalgo) ; Alger (Weinkauff) ; litora Galliae 

 (Petit , Dubkeuil) , Mole de Frontignan (Geangek) , Aigues-Mortes (Cl^ment), 

 Marseille, Morgillet, Ratonneau, Montredon, Pomegue (Maeion), Toulon, St. Ra- 

 phael (DouBLiEE, Gay); Mzza (Risso, V^^eany); Corsica (Payeaudeau, Requien); 

 Sardinia (Maktens) , Bonifacio (Rolle) ; Spezia (Tappaeone-Canefki) ; Livorno 

 (Appelius) ; Napoli (Scacchi), Pozzuoli (Poli) ; Sicilia (Philippi), Palermo, Sira- 

 cusa , Malta (Aeadas et Benoit) ; Taranto (Salis) ; Adria : Ancona , Venezia 

 (G. V. Maetens), Trieste, Lussin piccolo, Neresine (Geube), Lesina, Lissa, Cur- 

 zola (Hellee), Zara (Sandri) ; Morea (Deshayes) ; mare Aegeum (Foebes) ; litora 

 Syriae (Eheenbeeg) ; Aegyptus : Ramleh (Schneidee), 



. 2. L. aristatus Wkff. (Mytilus aristatus [Sol. Ms.] Dillw., Modiola caudi- 

 gera Lam., L. caudigerus Sow.). Testa subcylindrica, tenuis, antice tumida, rotun- 

 data, postice producta, attenuata et compressiuscula; umbones parvuli lateri antico 

 approximati; epidermis luteo-fusca, crusta calcarea obducta, postice appendicibus 

 rostriformibus obliquis terminata [Sectio Myoforceps Fischee]. — Long. 25 mm. 



D i s t r ib. : Atlanticum, Indicum. 



Habit. : Cap Matifou, Algeria (Weinkauff, Fischee) ; Palavas (Cette) 

 (Dubeeuil) ; Malta (Aeadas et Benoit), 



Crenella Beown. Testa ovata aut rhomboidea, cancellata aid decussata, umbo- 

 nibus anticis rectis ; ligamentum parvuni ; cardo intus utrinque dente cremdato munitus; 

 linea cardinalis cremdata. 



1. Cr. rhombea Fokb. etHLY. {Modiola rhombea Beek., Bhomboidella rhombea 

 Montee., Modiola Prideauxiana Beown, M. asperula S. Wood; juv. Cr. pellucida 

 MoNTEK. [Limopsis peUucida ^^^'F-Si.'^). Testa oblique rhomboidea, gibbosa, solidula,. 

 leviter iridescens, costulis radiantibus 60 — 70 lirisque concentricis 12 — 15 sculpta, 

 sub epidermide tenui decidua lutescente margaritaceo-alba ; margo anterior obtuse 

 truncato-rotundatus, ventralis leviter arcuatus, posterior productus, dorsalis postice 

 alatus; umbones valde antici, globosi, prominuli; cardo dente magno cuneiformi 

 serrato in utraque valva; ligamentum angustum, sed crassunh — Long. 2 — 8 mm. 



Distrib. : Atlanticum. 



Habit. : Gibraltar (McAndrew); litora Algeriae (Monteeosato) ; litora 

 Galliae (Petit) , Martigues (Dubreuil) , litora Provinciae , sin. Leonis (Martin,, 



