Nuculidae. 95 



inflata ; superticies laevis, lineis incrementi paucis signata; latus anticura breve, 

 rotundatum, acutissimum ; lunula nulla ; latus posticum longum acutissimum ; um- 

 bones prominentes, intlati, recurvi ; margo apico-posticus arcuatus, pallialis con- 

 vexus. — Long. 3,1, alt. '2,H, crass. 1,4 mm. 



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

 Habit. : Nizza (Locard) ; prof. 1521 — 153() ora,-. inter Sardiniam et Nea- 

 polim („Wasliington", Giglioli). 



DviiiiKmL Niiculam tcnueniM.TQ., speciem regionis septemtrionalis aut celticae, 

 ad litora Galliae („fort Brescou") reperisse dicit ; au A'. (Ledarn) tenuem Phil. dicitV 



2. Subfam. Ledinae Fischer. Margines pallii po.stice. siphones duos breves 

 partim aut omnino connatos formantes; linea pallialis sinuosa, fovea ligamen- 

 talis interna. 



Leda Schum. (incl. Nnculana Link, Lemhulns Leach, Jimonia Seg., Yoldia 

 M{>LL. p. p.). Siphones parvi , conjiwcti ; marffo paUii postice lohos duos siphonem 

 tertium simidantes fcrens; palpi magni post appendicidati; hranchiae anf/ustae; ^jes 

 magnus, antice lanceolatus, discum margine sulcato formans, hi/ssus nudus; testa soUda, 

 transvcrse ovata, aequivaJms, inaequilatera , postice producta; umhoncs approximati, 

 ptatdlum retro versi; superficies carina postica decurrcnte signata ; margo cardinalis 

 leviter angidatus; dentes cardinis numerosi; fovea ligamentaris interna; linea pal- 

 lialis sinuosa. 



1. L. commutata Phil. {Xucida striata Phil. , Arca minuta Costa, N. 

 minuta Scacchi, Lcda minuta Wkff. , Arca fragilis Chemn. , L. fragilis Jeffr., 

 ?LemIndus deltoides Risso). Testa ovata, gibba, tumida, antice rotundata, postice 

 in rostrum acutissinium producta, paullo inaequilatera, concentrice rugoso-striata, 

 ante rostrum plerumque leviter sinuata, utrinque carinata, carinis posticis ex um- 

 bonibus usque iii rostrum productis et aream ovatam includentibus, anticis spatium 

 quam area multo raajus ; striae ad carinas squaniosae ; color sub epiderniide pallide 

 cornea albidus. — Long. 10, alt. 6 rara. 



Distrib. : Mare lusitanicum, litora Hispaniae. — Fossilis in stratis tertiariis. 



Habit. : 20 — 185 org. prof. ; Gibraltar, Cartagena (McAndbew); Alger 

 (Weinkauff), Benzert, Rasel Amush (Jeffreys); litora Galliae (Petit, Dubreiil), 

 Marseille, Ratonneau, cap Pinede, Mejean, Maire, Riou, Garlaban (Marion), Tou- 

 lon, PorqueroIIes (Locard) ; Nizza (Risso, V]5rany); litora pederaontana (Jeff- 

 KEYs); Livorno, Elba (Appelius); Civitavecchia (Monterosato) ; Napoli (Costa, 

 ScACCHi); Sicilia (Philippi, Arapas et Bknoit), prora. S. Vi'o, Palermo, Sciac a 

 (M(^nterosato) ; „Adventure Bank" ( Jeffreys) ; Pantellaria, ]\lalta (^^Ic Andhkw, 

 Aradas) ; litora Tunetana (McAndkew;; Adria : Trieste (Stossich), Capodisiria, 

 Clierso, Zara (Sandki, Brusina); mare Aegeura (Jeffreys), Morea, Asia rainor, 

 frequ. (Fokhes). 



2. L. pella Sow. {Arca pella L. , A. /nterrupta Poli, Nucuta emarginata 

 Lam. . N. falnda Sow. , Lemhulus llosseanus Risso [Subgen. Lemhulus: rostruni 

 bicarinaturaj). Testa ovato-ol^longa, aequilatera, supia postice abbnviate cunei- 

 formis, ventiicosa, j^olita, alba, striis arcuato-obliquis et antice divaricatis undique 

 sculpta; regio postica superior angusta, subito excavata, angulo infra circum- 

 scripta, supra costa imbricato-squaraosa sculpta; margo dor-alis utrinque sub- 

 declivi^, autice rectiusculus, postice i-ubretusus demumque emarginatus; area sulco 

 profundo detinita , tjansversira lirato-corrugata ; lunula improssa , lanceolata. — 

 Diara. 12, alt. 7 nim 



Distiib. : ]\[are lusitanicuni, Japonicum ; Proi ontis. — Fossilis in stratis 

 tertiariis. 



