— 416 — 



Pectunculus sulcatus Calcara Foss. Altavilla p. 31 T. 1, F. 8. 

 Juv. = Pect. punctatus Calc lide Munteros. 

 Hab. Mare meiliterraneum. 



H. Pectunculus insubricus Brocchi. T. orbiculato- 

 cordata, semper latior quam altior, plus minusve obliqua, margine 

 dorsali recto utrinque subauriculato. solida, tumida, lineis radi- 

 antibus albis distantibus vix impressis et concentricis undulatis 

 sculpta, violascescens, lineis albis tlannnulatis variegata; umbones 

 mediani, approximati, non inHexi; margo denticulatus , dentibus 

 interdum medio sulcatis. — Diam. 50 Mm 



Arca insubrica Brocclii Conch foss p. 492 T. 11, F. 10 — (Pect.) 



Weinkauff Mittelm. p. 187 (negante Monterosato). 

 Pectunculus violascescens Lam. VI p. 492, — Philippi Enura. I 

 p. 61. — Reeve Conch. icou. sp. 9. — Payraudeau Corse T. 2, 

 F. 1. 

 Pectunculus gaditanus Hidalgo Esp. T. 73, F. 2. 3. — Locard Cat. 

 p. 478. 

 Var. = Pect. zonalis Laui. YI p. 492. - Reeve Conch. icon. F. 9a. 

 Var. = Pect. stellatus Lam. VI p. 491. 

 Juv. = Arca nummaria L., P. liueatus Phil. 



Pectunculns transversus Lani. VI p. 500, P. uudicardo Lam. VI 

 p. 498, Arca romulea Brocchi T. 11, F. 11, fossiles, P. pilosellus 

 et reticulatus Risso. 

 Hab. mare mediterraneum et lusitanicum. 



3. Genus Glomus Jeffreys. 



T. globosa, cartilagine interno, elongato, dentibus cardinis 

 minutis oblique dispositis. 



Glomus nitens Jeffreys. T. globulosa, tenuis, semi- 

 pellucida, nitens, lineis concentricis umbones versus evanescen- 

 tibus sculpta, sub epidermide pallide lutescenti-fusca albida; 

 marginibus rotundatis; uyibones parvi sed prominuli, calyci- 

 formes; lunulaindistincta; ligamentuni nullum; cartilago angustus, 

 lanceolatus, corneo-fuscus ; cardo brevis, obtusangulus, dilatatus, 

 denticulis antice 4 — 5, postice 8—10 longioribus, subtilibus. — 

 Diam. 2,25 Mm. Jeffreys angl. 



Glomus nitens Jeffreys Ann. Mag. Nov. 1876 p. 433. Pr. Z. S. 1879 



p. 573 T. 45, F. 5. 



Hab. in abyssis oceani atlantici. 



4. Genus Silicula Jeffreys. 



(Phaseolus Jeffr. ohm). 



T. ovata vel oblonga, antice hians, cartilagine interno, 

 minuto; dentibus laminaribus, linea cardinali paralleli, nec 

 angulatim dispositis ut in ceteris Arcidarum generibus. 



Silicula fragilis Jeffreys. T. ensiformis velobhque 

 oblonga, inaequilateralis, compressa, tenuis, vitrea, margaritacea, 

 semipellucida, striis numerosis subtilissimis concentricis subirre- 



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