2G4 PROCEEDINGS OF THE ACADEMY OF 



Globiconcha? sp. indet. 

 Pleurotoma Pedernalis ? Roem. sp. 

 (Fusus id. Roem.) 



A shell agreeing perfectly with Roemer's figure in Kreid. Texas, 

 in size, form, and sculpture; but on which the lines of growth 

 distinctly indicate the sinus of Pleurotoma. 



Ammonites Guadalupre, Roem. 



Ammonites Ouadalupce, Roem., pi. 9. fig. 1, and pi. 10, figs. 1, la. 

 Kreidebildungen von Texas, p. 32, pi. 2, fig. 1, la, lb. 



Roemer's figure represents a larger speeimen than the one be- 

 fore me, and one which exhibits only the more mature form of the 

 shell. The present fine example is 4.*! inches in its greater dia- 

 meter, and gives us some additional characters. It wants almost 

 entirely the dorsal ornamentation figured in Kreid. Texas ; the 

 dorsum being broad, nearly flat, and rounded on the margin. The 

 umbilical row of nodes is well developed, but the outer lateral row 

 is barely discernible ; their place being occupied, on the older 

 parts or the shell by faint undulations, which show a tendency to 

 form a series of bifurcate ribs extending outward from the above- 

 mentioned nodes. In the still younger stage, as exhibited by the 

 inner whorls, the shell is flattened discoiclal, very similar to A. 

 placenta or A. Pedernalis, without tubercles, or with no more 

 than are often shown by these species. The dorsum is then very 

 compressed laterally, and is truncated and bi-carinate, so that 

 young specimens of this shell, except for the wider umbilicus, 

 could readily be mistaken for either of the above, but more espe- 

 cially the latter species, which also occurs in the same rocks. 1 



Roemer's figure of the septum seems to have been drawn from 

 a weathered specimen. The differences between the details of his 

 lobes and mine are not more than I have frequently observed in 

 individuals of other species. 



Lima Kimballi, Gabb, n. s., pi. 11, fig. 1. 



This fine large species is represented by but a single mutilated 

 specimen, of which, while much of the outline is destroyed, the 

 surface is pretty well preserved, and is so characteristic that I 

 have ventured to name it. 



It is equivalve, compressed, very oblique, elongated, posterior 



See Pal. California, vol. ii. p. 258, pi. 35, figs. 1, la. 



