72 



morata; auriculae magnae aequales obsolete striatae; 

 pagina interna alba rufo marginata. — Lat. 33^ alt. 

 30 mill. 



19. Pecten trifidus Dkr. 

 Testa solid ula inaequivalvis tumida subaequilatera 

 paullulum obliqua, costis 18 regulariter tricarinatis 

 oblique striatis instructa; interstitia costis angustiora, 

 transversim subtiliterque striata; umbones tumidi inae- 

 quales; umbo valvae dextrae prominulus; color fuscus 

 albo marmoratus et variegatus. — Alt. 27 mill. 



20. Pecten vesiculosus Dkr. 

 Testa solidula ])aullum obliqua inaequivalvis, costis 

 radiantibus 15 aeqaalibus rotundatis obsolete striatis 

 paene laevibus, utrinque lamellatis, interstitiis tonerrime 

 ßtriatis transversimque cancellatis instructa; auricidae 

 impares acute costatae^ ad marginem cardinis utrinque 

 plicati subserratae; color externus rubescens vel albus 

 rubroque variegatus, internus albus et roseus. — Alt. 

 epec. maximi 27 mill. 



21. Pectunculus fulguratus Dkr. 

 Testa aequilatera suborbicularis crassa, alba, strigis 

 fuscis angulatis et fulguratis vivide picta, striis incre- 

 men ti obsoletis cincta; umbones tumiduli approximati 

 subacuti; ligamenti area parva angusta; cardo dentibus 

 validis munitus; pagina interna alba marginem versus 

 posticum fusco tincta. — Long. 34 mill. Long. alt. 

 crass. ratio numeris 100, 95, 55 respondet. 



22. Pectunculus vestitus Dkr. 

 Testa transversa suborbicularis, compressa, tenuicula, 

 striis radiantibus minimis sulcisque levibus subdistantibus 

 nee non lineis incrementi tenerrimis decussata; color 

 fundi albus, zonis maculisque angulatis et undatis ferru- 

 gineis varie pictus; umbones parvuli subacuti approximati 

 medium testarum tenentes; area ligamenti parva et an- 



