106 Pelecypoda. — Erycinacea. 



Distrib. : Atlanticum. — Fossilis in stratis tertiariis. 



Habit. : 1 — 250 org. prof. ; Mahon (Hidalgo); litora Galliae (Dubbeuil), 

 Antibes (id., forma, typ. et ? 31. semirubra) ; sinus leonis, Nizza (RfiCLuz, Vebany, 

 MacS) ; Napoli (Sars) ; Sicilia (Caron , ex Weinkauef) , Messina (Seguenza) ; 

 „Adventure Bank" (Jeffkets) ; Malta (McAndrew). 



3. Montacuta Voeringii Friele. Testa alba, ovata, convexiuscula , in- 

 aequilatera , umbonibus anticis prominulis ; laevis , hic illic vestigiis incrementi 

 sculpta, plerumque limo crasso fusco vestita; cardo fortis dentibus prominentibus.. 

 — Long. 3, alt. 2,6 mm. 



Distrib. : Atlanticam, in abyssis. 



Habit. : Palermo, 87 org. prof. (Monterosato). 



m 4. M. pellucida Jeffr. Testa ovata, convexa, tenuis, pellucida, nitens, 

 concentrice distincte striata , albida , parte postica breviore subtruncata , antica 

 elongata subexpansa, margine dorsali utrinque declivi ; umbones prominuli calyci- 

 formes submediani; fovea cartilaginis parva subumbonalis, marginibus incrassatis, 

 dentes in unica valva extante lamelliformes, anterior duplo major. — Long. 3 mm. 



Habit. : „Adventure Bank" (Jeffreys). 



5. M. ovata Jeffr. Testa rotundato-trigona, convexiuscula, modice solida, 

 haud nitens, laevis, albida; parte postica subito truncata, antica elevata rotun- 

 data; umbones parvi inflexi, ad '/5 long. aut. siti; dentes valvae dextrae breves, 

 V-formes, sinistrae lamelliformes. — Long. 2 mm. 



Distrib. : Atlanticum, in abyssis. 

 Habit. : Alger (Joly, ex Jeffreys). 



6. M. ferruginosa TuRT. (3I'i/a ferriKjinosaMTG., Tcllifm/a ferrtiginosa 8a^s, 

 M. oUonga Turt. , T. elliptica, gJabra Brown, 31. tenella Lov.). Testa sat con- 

 vexa, oblonga aut elliptica, parte antica rotundato-producta , postica brevissima, 

 oblique subtruncata , supra fere angulata , infra magis prominente et rotundata, 

 margine ventrali paullo arcuato, dorsali antico fere librato et ventrali subparallelo, 

 postico brevissimo abrupte termiuato ; umbones obtusi tumidi in ^/4 poster. siti; 

 valvae subtenues , cinereo-albae opacae , irregulariter concentrice striatae , epi- 

 dermide fuscata saepius ferrugineo incrustata tectae; cardo medio profundius in- 

 cisus, utrinque dente laterali. — Long. 8 mm. 



Distrib. : Atlanticum arcticiim. — Fossilis in stratis tertiariis Magnae 

 Britanniae. 



Habit. : 3 — 733 org. prof. ; Algesiras (Jeffreys) ; Alger, rar. (Wein- 

 KAUFF, Monterosato) ; litora Galliae (Petit), Palavas (Dollfus) ; Napoli (Tiberi) ; 

 „Adventure Bank" (Jeffreys); Sicilia: Aci-Trezza (Aradas et Benoit); Adria 

 (Brusina, teste Jeffreys). 



7. M. donacina S. Wood. Testa minuta, transversa, donaciformis , com- 

 pressa, valde inaequilatera, laevigata, postice brevissima, margine dorsali rectius- 

 culo, ventrali convexiusculo ; cardo in valva dextra dente ininuto pone foveolam 

 cartilaginis profundam obliquam; cartilago externa. — Long. 6 mm. 



Distrib. : Atlanticum. — Fossilis in stratis tertiariis. 



Habit. : Alger (Joly, ex Jeffkeys). 



Scacchia Phil. Fallium lobis magna cx parte separatis, orificio siphonali 

 singulo srssi/i ; pes linguiformis, tnagnus, compressus, txtsi constrictus; palpi modice 

 longi; brancliiae utrinque binae; testa ovata, transversa, tenuis, laevis, inaequilatera, 

 anticc longior ; cardo dentibus 1 — 2 primariis parvis ct lateralibus obsolctis plici- 

 formibus; ligamentum cxtermm parvum fibrosum , intenmm cartiJaginosum in fovea 

 oblonga. 



