Pectinidae. 77 



confertim radiata; pallide coccinea aut purpurea. albo-submaculata, aut miniacea 

 obsonrius sparsim tincta; auriculae valde inaequales, posticae vix conspicuae. — 

 Alt. i20 — 2;'), lon}^. 18 — '22 mm. — Status aftixus irre^ularis, sinuosus, distortus. 



Distril). : Atlanticum usque ad Norvej^iam. — Fossilis in stratis pliocenicis. 



Habit. : 30 — 100 ped. prof. ; litora Hispaniae: Gibraltar (McANnRKw), 

 Valencia, Mataro, Harcelona (Hidalgo), cabo de Gata (Jeffreys) ; ins. balear. : 

 Malion, Alcudia, Cabo Bajole (Hidalgo); litora Galliae (DirnnEuiL), Provinciae 

 (Petit), Roussillon (Locard) , Agde (Petit), Palavas (Dollfi;s), Aignes-Mortes 

 (CLftMENT), Marseille (Ancey), la Joliette, Mourepiano, St. Henri , Roucas-Blanc, 

 Morgillet, Cap Pinede, Mejean (Marion), Toulon (Petit, D(»i:rlier), St. Tropez 

 (Doublier), St. Nazaire, ins. Hyeres, Porquerolles (Locabd), Cannes (Doublier, 

 DArTZENBERo) ; Nizza (Risso, VftRANY); Corsica (Payraudeau, Re^uien); Sar- 

 dinia: Bonifacio (Rolle) ; Spezia (Tappabone-Canefri) ; Napoli (Poli, Scacchi); 

 Sicilia (Philippi), prom. S. Vito, Palermo (Montekosato) , Catania (Aradas et 

 Benoit); Malta (Aradas); litora Tunetana (]\I(Andre\v, Monterosato) ; Adria: 

 in salo ante Venetiam (G. v. Mabtens), Lussin piccolo (Grube), Lesina, Lissa, 

 Curzola , Ragusa (Heller) , Zara (Sandri) ; mare Aegeum : sinus Cervi , Morea, 

 Paros, prom. Crio, Asia minor (Forbes). 



Subgen. Amussium Jeffr. {Pleuronccfia Swains). Testa inaequivalvis, 

 suborbicularis , compressa , extra laevis aut varie sculpta , iiitus liris acutis ra- 

 diantibus munita. 



21. P. fenestratus Forb. (P. inaequiscnJpfKS Tib. , P. PhiVqjpii Acton, 

 nec RficL., P. Actoni Mart.). Testa minima, inaequivalvis , suborbiculata, valva 

 dextra concentrice striata, lamellis paullo elevatis, longitudinaliter sub lente costis 

 inaequalibus striata, valva sinistra tenuissime concentrice striata, versus marginem 

 valvae dextrae appressa ; auriculae subaequales , apicibus acutis. — Long. H, 

 lat. (j mm. 



Distrib. : Atlanticum. 



Habit. : 50 — 250 org. prof. ; Cartagena (Jeffbeys); Marseille, Peyssonel, 

 Riou, la Cassidagne, Marsilli (Marion), cap Sicie (Marion) ; Sicilia : prom. S. Vito, 

 Palermo (Monterosato), Messina, Aci Trezza (Aradas et Benoit), Messina (Se- 

 (iUENZA); .,AdventureBank" (Jeffrey's); mareAegeum (Jeffrfys), saxum „Ananas", 

 Amorgo (Forbes). 



22. P. Hoskynsi Forb. (P. imhrifcr Lov. , Anmssium Hoski/nsi Jeffr., 

 P. Jimfjriafus Phil. , P. antiquafus Phil. , P. concenfricus Forb.). Testa parva, 

 compressa, irregulariter suborbicularis, inaequivalvis, valva dextra minor, paullo 

 convexa , lineis concentricis regulariter arata , sinistra major , nodulis bulbosis 

 radiatim dispositis , plerumque detritis obducta ; auriculae inaequales minutae ; 

 facies interna liris radiantibus 12 — 14 plus minusve distinctis munita. — Diam. 

 8 — 10 mm. 



Distrib. : Mare Insitanicum, norvegicum. 



Habit. : Marseille, in abysso, Peyssonel (Makion) ; inter Sardiniam et Nea- 

 polim (^Washington", Gkilioli) ; Palermo , rariss. (Monterosato) ; .,Adventure 

 liank", in salo, 1456 org. prof. (Jeffreys); mare Aegeum: Serpho Pulo, saxum 

 ..Ananas", Milo, sinus Macri, Asia minor (Fobbes). 



3. Subordo. Mytilacea (Stol.) Fischer {Heteromyaria Bronn). 



Pallium marginibus liberis, sub ano tantum connatis, rarins in antica parte, 

 ita ut rima analis et branchialis aut siphones adsint ; pes parvus , plerumque 

 glandula magna byssifera ; musculi duo byssum adducentes, anterior et posterior ; 



