NATURAL SCIENCES OP PHILADELPHIA. 19 



T. Choctawensis, Shumard, Marcy's Report, p. 195, pi. 2, f. 3. 



From the description given of this species, it would appear to be distinct 

 from T. Wacoensis, but I have specimens in my collection intermediate in form 

 between the two. The figure given is almost useless for the purpose of 

 Identification, but seems to me to be nothing but a young specimen of Roemer's 

 species, a little more gibbous than usual. The slight difference of outline i. c 

 not of enough importance to warrant their separation. 



T. Guadalupse, Roera. Kreide. von Texas, p. 82, pi. 6, f. 3. 



Resembles a terebratulina, especially in the hinge margin of the ventral 

 valve ; but if the figure is correct, in regard to the form of the area of the 

 dorsal valve, it is a true Terebratula. 



Terebrateiaa, d'Orb. 



T. plicata, d'Orb. Prod. Pal., v. 2, p. 259. 



T. Sayi, Gabb, 1859. Cat. Cret., p. 17, Proc. Acad. Nat. Sci. 1859. 

 Terebratala plicata, Say. Silliman's Jour. v. 2, p. 43. 

 Terebratula Sayi, Morton. Synopsis, p. 71, pi. 3, f. 3, 4. 

 Common in New Jersey. 



T. Vanuxemiana, d'Orb. Prod. Pal., v. 2, p. 259. 



Terebratula, id., Lyell and Forbes. Quart. Jour. Geol. So., London, v. 1, p. 62 

 Resembles the preceding species, but is undoubtedly distinct. It is found 



in New Jersey, but is rare. 



Terebratulina, d'Orb. 



T. Floridina, d'Orb. Prod. Pal., v. 2, p. 258. 



Terebratula, id., Morton. Synopsis, p. 72, pi. 16, f. 7. 

 From the Cretaceous limestone of Alabama. 



T. lachryma, d'Orb. Prod. Pal., 396. 



Terebratula, id., Morton. Synopsis, p. 72, pi. 10, f. 11, and pi. 16, f. 6. 



Said by Dr. Morton to occur in South Carolina, and in Alabama, in beds, 

 since referred to the Eocene. M. d'Orbigny places it in the lower Eocene. 

 This is incorrect, since I have it from the Cretaceous marls of New Jersey. 



T. Hal liana, n. s. 



Suborbicular, flattened, most convex near the upper portion. The sides 

 slope towards the beak for about a third of the length of the shell. The 

 lower portion of the shell is rounded, presenting a very obscure angulation 

 where the lateral margins unite with the basal ; basal margin faintly sinuous. 

 Lower valves regularly but moderately convex, with the sinus only visible on 

 the lower fourth ; foramen moderately large, area high. Upper valve convex 

 for half its length, but in old specimens flat or concave for the remainder ; 

 hinge margin of the upper valve sloping distinctly from the beak, laterally. 

 Surface marked by numerous rounded dichotomous ribs, crossed by very fine 

 concentric lines. 



This species differs from T. lachryma in form, so that a glance will serve to 

 distinguish it. It resembles T. Floridana in shape, but the outline is somewhat 

 more rounded than the specimen figured in " Synopsis." It differs, however, 

 in having a more distinct sinus, in being less gibbous, and in the ribs being 

 more prominent, larger and not so numerous. It gives me great pleasure to 

 dedicate this beautiful species to the most able student of American Brachiopoda. 

 Prof. Jas. Hall, of Albany, N. Y. 



Locality. New Jersey. 



The only species of the family Lingulidaz yet known, is 



Lingula su bspatu lata, Hall and Meek, 1855. Mem. Am. Acad., Boston, 

 2s.,v. 5, p. 380, pi. 1. 



1861.] 



