298 DESCRIPTION OF A COLLECTION OF FOSSILS, 



E. PARASITICA, Gabb? PL 42, fig. 8, 8a. 



E. parasitica, Gabb, Pal. California, vol. 1, p. 205, PL 26, f. 192, and PI. 31, f. 2t3. 



Attached to the large Cucullcea Orhignyana is a group of little parasitic Exo- 

 gyras, all of the same size, and one of which is figured, showing the upper valve 

 and a side view of the lower. In an object possessing so few specific characters I 

 can find none by which to separate this shell from that described by me under the 

 above name from the Cretaceous formation of California. 



GRYPHJEA, Lam. 



G. RivoTii, Bayle and Coquand (sp.). 



Oiitrea, id., B. & C, Mem. GeoL Soc. Fr., 2 s., v. 4, p. 24, PL 1, fig. 7, 8. 



0. cymbium, B. & C, pais, (not Desh.), loc. cit., PL 5, f. &-1. 



From the silver mines of Huantajaya. From the figures they give, I strongly 

 suspect that these authors have also included other specimens (PI, 4, f. 1, 2, 4) in 

 "O. cymhium^' that belong to this species. 



GRYPH^A, Lam. 

 G., sj3.? PL 1, fig. 13, 13a. 



Five specimens, all lower valves, exactly alike, from the Cretaceous of the 

 Hacienda of Macango, Prov. of Pataz, look like miniature examples of G. vesicu- 

 laris. In all details of shape and proportions they agree so exactly that, were it 

 not for the marked difl'erence in size I should not hesitate in referring them to that 

 species. But their uniformity of size seems to point to a good specific diff"erence. 

 I therefore propose the provisional name of G. vesiculoides, in case they may event- 

 ually prove distinct. - 



Figures. Natural size. 



TEREBRATULA, Brag.* 

 T. Raimondiana, n. s., PL 42, fig. 9, 9a, 9b. 



Shell ovate ; beak prominent, overhanging ; foramen large, sides most promi- 

 nent in the middle, below sloping nearly straight to the base, which is subtruncate; 

 small valve with two large plications, which begin about the middle and run to the 

 outer sides of the basal margin ; between and on each side of these is a broad, 

 shallow depression, making the edges of the shell sinuous and emarginating the 

 base of the larger valve. On the large valve there is barely a trace of the plica- 

 tions seen on the smaller valve, the surface being almost evenly convex. Surface 

 marked by lines of growth and a few very obscure radiating lines. 



* I liave attributed the genus Terehratula to Brugiere on the ground that, although the name was used for 

 nearly a century before, by various pre-Linnsean authors, Brugiere was the first to restrict it to near its present 

 limits. Even Linnajus confounded it with Anomia, and the author of the Encyclopedic Methodique was the 

 first to make a truly scientific use of the name. 



