79 



the shape of the present shell is not so oblique, and its valves are not so 

 decidedly unequal in convexity as in typical examples of that sub-genns. 

 M. amygdaloidea\ seems congeaerie with a fossil from the Cretaceous 

 rocks of Yaneouver Island, described by Mr. Gabb * as Meleayrina 

 antiqua. The differences between the two species are, however, tolerably 

 clear. In M. antiqua, the height is not much greater than the length, 

 the beaks are terminal, and the hinge line is straight and almost 

 horizontal. In M. nrnygdrdoidea, the height greatly exceeds the length, 

 the beaks are sub-central, and the hinge margin is convex and very 

 obliijuo. 



Inoceramus concentricus, Parkfxson. 



Inoccramuts concentricus, Sowerby. "Mineral Concliology," Vol. III., page 183, 

 Plate CCCV. 



Inoceraiuus concentricus, Goldfuss. " Petrefacta^ Germaniciv," Vol. II., Plate CIX. 

 figs. 8a — c, but not d and e. 



Inoceramus concentricus, D'Orbigny. " Paleoutologie Francaise, Terrains Cretaces," 

 Vol. III., page 506, Plate CCCCIV. 



Inoceramus concentricus, Pictet. " Traite de Paleontologie," Atlas, Plate LXXXII., 

 fig. 18. 



Twenty- five S2)ecimens of an Inoceramus, apparently refei'able to a 

 single species, were collected by Mr. Eichardson at three localities. 

 Twelve are from the lower sihales of Maud and Lina I^slands ; live from 

 rocks of the same horizon on the shores of a small bay south of Christie 

 Bay; and eight from the upper shales on Cxraham Island, about three 

 miles to the north-east of the village of Cowgitz. They are the only 

 fossils procured from the two last-mentioned localities, which are indi- 

 cated on the map by the letter F. 



Eight of the examples from Maud and Lina Islands are sufficiently 

 perfect and undistorted to enable them to be identified with some 

 certainty as the Inoceramus concentricus of Em-opean authors. Although 

 nothing more than tolerably perfect casts, the obovate outline, the con- 

 vexity of the left valve, with its prominent and .semi-si)iral beak, and 

 the flatter and smaller right valve, so characteristic of I. concentricus, 

 are very clearly shown. These undistorted fossils vary both in shape 

 and sculpture ; oblique specimens, which are regularly costate, might 

 have served for the originals of Groldfuss' figures; while others, again, 

 with a more nearly equilateral contour and irregular concentric stria- 

 tion, correspond better with the illustrations of D'Orbigny and Pictet. 



* " Palaeontology of California." Vol. II., page 192, Plate XXXI., fig. 89. 



