94 Pelecypoda. — Arcacea. 



quam altior, margine antico oblique truncato et cum ventrali sat arcuato angulum 

 fere formante, dorsali postice leviter arcuato, non vero expanso, umbonibus pro- 

 minulis , lunula distincta , cordata ; valvae solidulae , lineis concentricis crebris 

 distinctissimis et radiantibus minus conspicuis sculptae, epidermide pallide vires- 

 cente vix nitida, intus margaritacea radiatim striatae ; margine distincte crenulato ; 

 linea cardinali sat arcuata, denticulis anticis circ. 8, posticis 16. — Long. 6 mm. 



D i s t r i b. : Atlanticum boreale. 



Habit. : Marseille, Peyssonel (Makion). 



5. Nucula nitida Sow. Testa acute trigona, ad umbones convexa, mar- 

 ginem versus compressa, solidula , nitens , striis concentricis distinctis , ad latera 

 ad intersectionem striarum longitudinalium subnodulosis, lactea, epidermide laevis- 

 sima nitente, lutescenti-fusca ; umbones prorainuli; lunula sulco cincta, medio minus 

 elevata; cardo dentibus circ. 12 anticis, 20 posticis; facies interna margaritacea, 

 marginibus antico et ventrali distincte crenatis. — Diam. 9 mm. 



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

 tertiariis. 



Habit. : — 120 org. ; Gibraltar, Cartagena (McAndrew), Valencia (Hi- 

 DALGo); Alger (Weinkauff), Bona, Benzert (Jeffreys); litora Galliae (Dubreuil), 

 Marseille , locis perraultis (Marion) , Toulon (Locard) ; Nizza (V^rany) ; litora 

 pederaontana (Jeffreys) ; Spezia (Tapparone-Canepri) ; Napoli, Palermo (Aradas 

 et Benoit); „Adventure Bank" (Jepfreys); sinus Tunetanus (Jefpreys) ; Adria 

 (Weinkauff) ; Smyrna (Jeffreys). 



6. N. striatissima Seg. Testa parva, trigona, inflata, solida, laevis, 

 transverse vix rugosa, radiatim tenuissime striata, pauUo obliqua ; latus anticum 

 breve, subtruncatum ; lunula ovata, laevis, ad latera paullo excavata, medio in- 

 flata ; latus posticum curviusculum ; umbones inflati, valde prominentes, conspicue 

 recurvi; margo pallialis paullo convexus. — Long. 5 mra, alt. 4 nira, crass. 2,2 ram. 



Distrib. : Atlauticum, in abj^ssis. — Fossilis in stratis tertiariis Italiae. 

 Habit. : Nizza (Locaed). 



7. N. tenuis Mtg. {X. decipiens Phil.). Testa compressa, oblique ovato- 

 triangula , extremitate antica brevissiraa , subtruncata , posttca infra rotundato- 

 producta, raargine ventrali leviter arcuato, dorsali postico medio leviter expanso 

 et compresso, umbonibus parvis, lunula angusta lanceolata; valvae tenues, laeves 

 epidermide luteo-virescente nitidissima tectae, marginibus intus laevibus ; denticulis 

 cardinalibus anticis circ. 10, posticis circ. 18. — Long. 11 mra. 



D i s t r i b. : Circumpolaris ; mare Atlanticura boreale. 



Habit. : GO — 250 ped. prof. ; Mediterraneura, Aegeum (Naees, Jeppreys); 

 Sicilia: prom. S. Vito (Monterosato). 



8. N. aegeensis Forb. {N. MacAndrci Hanl.; juv.?: N. perminima Monter., 

 ex opin. Jeffe.). Testa ovata, subdepressa, ad umbones inflata, laevis, inaequi- 

 latera, epiderraide polita lutescente, antice rotundata, postice angulata, raargine 

 ventrali valde arcuato intus laevi, area et lunula laevibus, lunula concave de- 

 finita; umbones valde prominuli. — Diam. 4 mra. 



D i s t r i b. : Sinus bisca^^ensis. — Fossilis in stratis tertiariis Siciliae 

 (Ficarazzi). 



Habit. : GO — 250 org. prof. ; Alger: Jijeli, Benzert ; „Adventure Bank" 

 (Jeffreys); 1521 — 1536 org. prof. inter Sardiniam et Neapolim („Washington", 

 GiGLioLi); litora Tunetana (McAndrew); Adria (Jeffreys, sed ex opin. Bru- 

 siNAE in Adriatico adhuc non reperta species). 



9. N. corbuloides Seg. Testa parvula, tenuis, rotundato-ovata, obliqua, 



