' 415 - 



Arca Weiukauffi Crosse J. C. X p. 325. - Weinkauff Mittelm. 

 p. 201. 

 Hab. ad Algeriam ? — Species valde dubia. 



2. Genus Pectunculus Lamarck. 



T. suborbicularis , aequivalvis, aequilatera, solidissima, 

 epidermide velutina tecta; umbones paruni intorti; ligamentum 

 externum; area distincta, sulcata; margo cardinalis regulariter 

 arcuatus, dentibus numerosis brevibus fortibus, medio in adultis 

 obsoletis, armatus ; margo crenulatus. 



1. Pectunculus glycimeris Linne. T. suborbicu- 

 laris, leviter compressa, solidissima, striis radiantibus subtilissi- 

 mis lineisque compressis concentricis sculpta, sub epidermide 

 crassa fusca in junioribus ciliosa lutescenti-albida, purpureo- 

 fusco maculata et fulgurata; umbonibus jiarvis, prominulis; 

 ligamentum fuscum, fasciculis 8—9; cardo crassissimus, 2].^ am- 

 bitus occupans, dentibus antice et postice 6- 7 majoribus; latus 

 internum lutescens interdum purpureo diffuse tinctum. — Diam. 

 60—80 Mm. 



Arca glycimeris Linne ed. 12 p. 1143 (nec Lam.) — (Pect.) Forbes 

 et Hauley II p. 245 T. 46, F. 4-7. — Sow. 111. Ind. T. 8, 

 F. 13. - Jeffreys Br. Conch. II p. 166 T. 30, F. 2. - Hidalgo 

 Esp. T. 72, F. 8. - Weinkauff Mittelm. I p. 183 II p. 436. — 

 Locard Cat. p. 476. — Reeve Couch. icon. sp. 12. 



Arca pilosa Linne ed. 12 p. 1143. — (Pect.) Lamarck VI p. 485.— 

 Philippi En. I p. 65. — Eeeve Conch. icon. sp. 13. — Hidalgo 

 Esp. T. 72, F. 7, T. 73, F. 6. — Monterosato Enum. e Sin. p. 7. 



Pectunculus marmoratus Lam. VI p. 485. 



Pectunculus stellatus Philippi Euum. I p. 61. — Reeve Conch. icon. 

 sp. 5. — Nec Lam. 



Glycimeris orbiculata da Costa, Arca uudata Chemuitz, A. marmo- 

 rata Chemu., A. flammulata Eenier, Pect. decussatus et numma- 

 rius Turton, P. variahilis Sow. (foss.). 

 Hab. e mediterraneo usque ad Britanniam. 



2. Pectunculus bimaculatus Poli. T. orbiculata, 

 transversa, subaequilatera , in adultis turgida, crassissima, 

 radiatim distincte striata, sub epidermide irregulariter pilosa 

 unicolor rufa, zonis obscurioribus tantum picta, intus alba, ma- 

 cula magna castanea signata; margo dentibus ultra 60utrinque 

 evanescentibus ; cardo dentibus antice 13, postice 10. — Diam. 

 ad 125, alt. 120 Mm. 



Arca bimaculata Poli Test. Sicil. T. 25, F. 17, 18. — AYeiukauff 

 Mittelm. II p. 437. — Eisso Eur. mer. IV p. 316. — Hidalgo 

 Esp. T. 73, F. 5. 6. — Locard Cat. p. 477. — aionterosato Enum. 

 e Sin. p. 7. 



Pectunculus glycimeris Lamarck VI p. 485 uec L. — Phil. En, I 

 p. 60. 



Pectunculus siculus Eeeve Couch. icou. sp. 11. 



Pectunculus pilosus Weinkauff Mittelm. I p. 186. 



