Description of the Fossils in the older Deposits of the Rhenish Provinces. 375 



turn is also found at Adorf in the Duchy of Nassau and in Westphalia, in the limestone of Schubelham- 

 mer, in the Fichtelgebirge, and in New Holland. 



This shell had been long since called Venericardia retrostriata by De Buch ; we know not why Gold- 

 fuss should have given it another name without referring to it, and without explaining his motive. 



3. Cardium Lyellii, nob., Tab. nost., XXXVI. f. 8, 8 a, 8 b. 



Shell subtrigonal, elevated, very narrow at its summit, concave anteriorly, angular behind and fur- 

 nished on each valve with a sharp-edged keel, which sets off from the beaks and runs down to the 

 lower anterior angle. Beaks large, very much turned forward and contiguous. The anterior part of 

 the valves is covered with oblique and sinuous striae of growth, and the posterior part is ornamented 

 with nine or ten longitudinal ribs, separated by deep striae. Length, 9 millim. ; thickness, 7. 

 The concavity of the anterior part of this little shell, the size and the curvature of its beaks, the dis- 

 position of its posterior ribs, and its general form, distinguish it neatly from C. mytiloides, C. gracile, 

 and C.tripartitum of Miinster (see Goldf. Petref. Tab. CXLII.figs.5, 6, and 10), as well as from the C. 

 decussatum and C. bicarinatum of Count Munster (Beitriige, Heft iii. PI. XII. f. 6 and 7). 

 Villmar; rare. 



4. Cardium Villmarense, nob.. Tab. nost., XXXVI. f. 9, 9 a, 9 b. Var. a, f. 10, 10 a. 



Shell cordiform, winged, subequilateral, inflated in the middle, prolonged by two appendages, one an- 

 terior, broad and thick, the other posterior, short and spine-like. Beaks contiguous, from which set 

 off radiating ribs, which are flattened, alternately salient and depressed, traversed by indistinct but 

 regularly separated concentric striae. Both the ribs and the striae are continued, only more atte- 

 nuated, over the appendages of the valves. Length, 8 millim. ; thickness, 7. 



Var. a. fig. 10, 10 a. This lenticular variety is distinguished from the preceding, by its more circular, 

 less ventricose form, and by its constantly much smaller stature. 



Villmar ; very rare. 



5. Cardium pectunculoides, nob.. Tab. nost., XXXVI. f. 12, 12 a. 



Shell equilateral, circular, moderately ventricose. Beaks small and nearly contiguous. Wide and 

 slightly elevated concentric folds, which are pretty regular, cover nearly the whole of each valve, 

 and become changed near the edges into rather lamellar and striated folds. On both sides of the 

 beaks near the upper edge are seen some longitudinal, sharp, pretty distinct folds. Hinge unknown. 



Oberscheld, Waldeck ; common. 



1. Lucina proa%na, Goldf. Petrefacta Germaniae, PI. CXLVI. f. 6. Tab. nost., XXXVII. f. 1, 1 a. 



We have given a new representation of this species, so abundant in the ancient beds of the banks of 

 the Rhine, because the shell figured by Goldfuss is either a variety or a young individual, which will be 

 easily seen upon comparing the two figures. Length, 64 millim. ; width, 64 ; thickness, 28. 



Eifel, Lustheide ; common. 



2. Ludna antiqua, Goldf., he. cit., PI. CXLVI. f. 7. 



A careful examination is requisite to avoid confounding this species with the L. gibberula of the lower 

 tertiary beds. 



3. Lucina Dufrenoyi, nob.. Tab. nost., XXXVII. f. 2, 2 a. 



Shell transverse, subquadrilateral, rounded, subequilateral, regularly ventricose, covered with concen- 

 tric, unequal and pretty distinct lines of growth. Beaks small, contiguous, inclined forward. 

 Corselet and lunule slightly apparent. Shell thin. Hinge unknown. Length, 40 millim. ; width, 

 53 ; thickness, 25- 



3 c2 



