14 



Belemnites. (Sp. iindt.) 



Besides the three specimens described tibove, a tolerably complete 

 phrai*'mocone and a poi-tion of anotber were collected, whicb must bave 

 belonged to Belemnites of considerable size. Mr. Billings describes the 

 most perfect of tbe two as follows : — " It consists of a portion of a large 

 ])hragmocone, two and a half inches ni length, one and a half inches 

 iicro.ss the larger extremity, and thirteen lines across the smaller. The 

 se])ta are modei-atel}' convex, and there are twelve chambers ia the 

 specimen." Little can be added to this description; the measurements 

 have been tested and found essentially correct, though the diameter of 

 the smaller end seems nearer to twelve than to thirteen lines. These 

 fragments may indicate the existence of a second species at this localit}-, 

 or they may represent merely the adult stage of the one first descril)ed. 

 The evidence is altogether insufficient to show which of these views is 

 the correct one, though tlie latter is, perhaps, the most .probable 

 supposition. 



Nautilus. (Sp. undt.) 



Perliaps N. e-legans, D'Orbigny,* but not of Sowerby. 

 Or, possibly, N. psciuio-elegans, D'Orbigny.f 



Shell (or rathei- cast) inflated, globose ; maximum thickness not much 

 less than the entii-e diameter, the proportions being nearh' as five to 

 seven; umbilicus either very small or entirely closed, most probably 

 the latter. Most of the inner septa are crushed out of shape, but 

 the outline of the outer one is concave and simple ; the position 

 of the siphuncle is unknown. Apertui-e transvei'sely reniform or 

 sublunate, rather deeply emarginate by the preceding volution. Mea- 

 suring from the periphery to the centi-e of the margin of the next 

 whorl, where the emarginatiouis greatest, the height of the aperture is 

 much less than its width. The surface of the cast is ornamented with 

 transverse radiating ribs, which at first curve convexlj^ forwards across 

 the sides, and then backwards, so that each one forms a shallow, but 

 rather angular sinus on the periphery. The ribs appear to run exactly 

 parallel with the ti-ue outer lip of the shell, and their forward curve is 



* " Palfeontologio FiaiiQaise. Terrains Cr^taees." Vol. I., page 87. Atlas, Plate XIX. 



t " •' " " Vol. I., page 70, Atlas, Plates VIII. and IX. 



