152 GEOLOGY AND PALJ<:ONTOLOGY. 



INOCERAMUS MYTILOPSIS. 



Plate V, Fig. 6, a, b. 



Inoceramus mytiloides, Eoemer, (not Mantell,) Kreide. von Texas, p. 60, PL VII, fig. 5. 



Oblique, elongate-ovate, inflated, concentrically plicated and striated ; umbo very oblique, 

 summit acute, prominent ; buccal side sbort, extremity obtusely rounded, and the margin above 

 and below subtruncated, the latter parallel with the anal margin, which is oblique and sub- 

 truncated ; anal side somewhat compressed. 



This species is more oblique than /. mytiloides, with a longer cardinal line ; is proportionally 

 less elevated, with the margins subangulated, while in the /. mytiloides, they are regularly or 

 obtusely rounded. 



INOCERAMUS TEXANUS. 



Plate V, Fig. 7. 



Elevated, suboval, compressed, equilateral ; hinge, and lateral, and basal margins regularly 

 rounded ; folds robust, prominent, unequal ; summit not prominent. 

 Locality. — Western Texas. 



INOCERAMUS CRISPII. 



Plate V, Fig. 8. 



Inoceramus Crispii, Mantell, Foss. of South Downs, p. 133, PI. XXVII, fig. 11. 



Equivalve, elongate-ovate, transverse, inflated, concentrically undulato-plicate, elegantly and 

 finely striated ; anal side subdepressed, produced ; buccal side short, obliquely subtruncated ; 

 cardinal margin long and straight. 



This appears to be the same species that Dr. Morton described as I. Bardbini, but his speci- 

 mens were very imperfect. 



Localities, — San Antonio, Texas ; Green county, Alabama. 



PHOLADOMYA, Sowerby. 



pholadomya texana. 



Plate XIX, Fig. 3. 



A fragment of a cast, with 13-14 distant, prominent, narrow, somewhat undulated or irregular 

 ribs ; intervening spaces concave ; concentric lines coarse, but not very prominent. 

 Locality. — Turkey creek, Leon and Eagle Pass roads. 



ASTARTE, Sowerby. 



ASTAETE TEX ANA. 



Plate V, Fig. 9. 



Triangular, convex-depressed ; buccal extremity subangulated, and much above the line of 

 the base, which is regularly rounded. A cast representing both valves. 

 The locality is unknown to me ; it is from western Texas. 



