NEW SPECIES OF PALHOZOIC FOSSILS. 583 
BRACHIOPODA. 
LINGULA PINNAFORMIS. (N. 8.) 
(Tab. I. n, figs. 4, 6, 8.) 
Specific character.—Shell shaped much like a Pinna; moderately convex ; expanded, and running 
to a point at the beak, which in the dorsal valve is long, conical, and slender, curved towards the beak 
of the ventral valve, which it overhangs and embraces as with a deltidium. Surface marked with fine 
concentric striz ; when exfoliated, longitudinal striae can also be detected towards the circumference of 
the shell. Length, § of an inch; greatest width, 7's of an inch. 
This fossil is abundant in the siliceo-ealcareous layers near the base of member b of F. 1, at the Falls 
of the St. Croix, Minnesota. 
LINGULA AMPLA. (N. 8.) 
(Tab. I. 3, fig. 5.) 
Specific character—This species has a greater circumference and superficial area than any of the 
others hitherto discovered in F. 1. Shell nearly oval, rather flat ; beak blunt, and not projecting beyond 
the general contour of the shell, and formed more after the manner of the beaks of Terebratule. A few 
faint concentric stri. Length, 1} of an inch; width, ,8, of an inch. 
This species occurs in the Lingula and Obolus grits, member c, near Mountain Island, at the Dalles of 
the St. Croix, and elsewhere in Wisconsin. 
ORBICULA PRIMA. (N. 8.) 
(Tab. I. 8, figs. 17 and 19, and top figures on Tab. 4.) 
Specific character.—Shell obliquely depressed, conical ; circumference nearly circular or slightly quad- 
rangular ; concentric and somewhat subquadrangular stric. 4, to 5, of an inch in diameter. 
Associated with the preceding species at the Falls of St. Croix, Minnesota. 
ATRYPA COMIS. (N. 8.) 
(Tab. III. a, fig. 4.) 
Specific character.—One of the valves of this Atrypa being broken and distorted, it only admits of a 
partial description. Shell subspheroidal; umbos but slightly prominent; surface smooth. Diameter 
about one inch. From the Davenport Limestone of the Upper Rapids of the Mississippi of Devonian 
date. | 
CHONETES GRANULIFERA. (N. 8.) 
(Tab. V., fig. 12.) 
cific character.—When first obtained, this Chonctes was referred to the species C. variolata; a 
closer inspection, however, induces the belief that it is a new species, since it differs from that species in 
the following characters : ols 
The ribs, or rather striae, are finer, and are not separated by other finer striz, visible to a moderate 
magnifying power, nor are there any pits (“fossettes’”) to be observed on them. The surface of the 
concave, ventral valve is provided, like the C. variolata, with pustules, but they are fewer in number - 
less regularly disposed than shown on Pl. XX., fig. 2. a, of De Komich’s work on We Productus and Chonetes. 
The form of the medial tooth of the ventral valve, and the anatomy of its visceral portion, are diffe- 
rent, as may be seen by reference to Tab. V., fig. 12 b. 
From the carboniferous limestone, near the mouth of Keg Creek. 
