83 



Out of about twenty s}3ecimens of this little Pecten, only one shows 

 the peciiliiu' nodosely-cancellate sculpture which forms one of the best 

 distinctive characters of the species ; the rest are all exfoliated. 



At first sight S. Meekiana might easily be confmmded with the Pecten 

 Rogoznicensis of Zittel,* but a closer comparison will show important 

 dilt'erences in the sculpture of the two shells. In P. Rogoznicen&is the 

 relatively coarse radiating ribs cut through the finer and more delicate 

 concentric costoe, and accordingly there are no tubercles or swellings 

 at the point of contact. 



The surface markings of Pecten nodo&o-cancellata EichwaUl, f as the 

 name suggests, are still more like those of <S. Meekiana, but the narrowly 

 spathulate shape of the Eussian shell will at once enable it to be 

 recognized. 



The species is dedicated to Mi*. F. B. Meek, of Washington, one of the 

 most industrious and accurate of American pateontologists, and the 

 author of the sub-genus to which it belongs. 



OsTRiEA. (Sp. undt.) 



Three single valves of a species of Ostrcea, two of which are so much 

 exfoliated that they only show the general outline of the shell, which is 

 what would generally be called long and narrow, but the elongation is 

 in the direction of the height, which is nearl}^ twice the length. Their 

 contour, too, is irregular, being somewhat dilated below the middle. 

 The third specimen is broadly sub-triangular, the narrowest part being 

 near the beaks ; the test is very thick. The characters of the three 

 collectively, are rather like those of the Ostrcea Leymerii of Deshayes, a 

 French Upper Xeocomian fossil. 



BEACHIOPODA. 



Terebratula (?) (Sp. undt.) 



Shell subovate or suborbicular, usually a little pointed both above and 

 below. In the adult the length is greater than the width, but in half- 

 grown individuals the opposite is the case Pedicelled or neural valve 

 without Viwy definite umbonal ridge, but convex in the middle, and 



* " Die Fauna der Aelteren Cephalopoden Fuehrenden Tithonbildungen," page 241, Plate XXXVI., 

 figs. 23, a, b. 



t " Lethea Rossica," Vol. II., page 445. Atlas, flate XX., figs. 11, a, b 



