114 INVERTEBRATA. 



NUCULA SUBTRIANGULA, Koch and Dunker. 



? Nucula subtrigona, Roemer, 1836. Nordd. Ool. pi. vi., f. 6. 

 Nucula subtriangula, Koch and Dunker, 1837, Beitr. Nordd. 

 Ool, p. 50, pi. vi., f. 1. 



Localities. Upware, Shanklin. 



N. Europe. Hils Thon, Elligsevbrink. 



ARCA MARULLENSIS, D'Orbigny. 



Area Marullensis, D'Orb., Pal Fr. Terr. Orel, in., p. 205, pi. 



cccx., f. 35. 



Pictet and Campiche, Pal Suisse, Terr. 



Cret., St Croix, p. 432, pi. cxxx., f. 14. 



The ligament area is deeply retreating. 



Localities. Upware, Farringdon. 



8. Europe. Morteau (Doubs), Urgonien infr. 



. ARCA CARTERONI, D'Orbigny. 

 (Plate v., fig. 7, a, b.) 



Area Carteroni, D'Orb., Pal Fr. Terr. Cret, ill., pi. cccix., 



f. 48. 



Pictet and Campiche, Pal Suisse Terr. Cret., 



St Croix, p. 436, pi. cxxx., f. 9. 



A rare shell, belonging to the sub-genus Byssoarca. The 

 lozenge-shaped ligament area is even more developed in our speci- 

 mens than in the figures of French shells ; it is crossed by as many 

 as eight pairs of the angular ligament grooves. 



Localities. Upware, Atherfield, Peasmarsh, I.W. 



S. Europe. St Croix. Landeron. 

 Range. Mid. Neocomian, Urgonieu. 



