682 APP EN DIXTL 
strongly fluted-excavate. Plate 1, fig. 1, natural size, 1 a, part of two rays of the dorsal 
fin, enlarged. 
The specimen of this remarkable fossil fish was wanting in its head, together with the 
anterior part of the body and pectoral fin. The part remaining has the following dimen- 
sions :— 
Length of body 12 inches ; of which 22 inches are anterior to the ventral fin, 35 inches 
from the anterior part of ventral fin to anterior part of anal fin; 3g inches from the ante- 
rior part of anal fin to the anterior part of caudal, or the length of anal fin along the 
body ; 3 inches or more, length of caudal fin. 
Breadth of the body from the anterior part of specimen nearly to anal fin, 24 inches ; 
at posterior part of anal fin 1 inch. 
Ventral fin inch broad at base; 2 inches or more long. 
Dorsal fin, 1z inch broad at base ; 24 inches long, on its anterior margin. Articula- 
tions of anterior rays near base, about a line long, and 8 or 4 times as long as broad. 
Free spines anterior to rays 3 to Z of an inch long. 
Scales 4 inch broad over middle of body ; posteriorly, breadth diminishing and height 
half the breadth or less. 
This specimen is from the B Coal Pit, Newcastle, and was taken out by Mr. James 
Steel, as already stated on page 482, 
2, MOLLUSCA. 
a. Mollusca Brachiopoda. 
1. TerepratuLa amyepata (Dana).—Regularly oblong ovate, and regularly and 
nearly equally convex on the two surfaces ; thickest at middle; lower margin arcuate. 
Surface smooth, with usually a few obsolescent concentric folds and some faint radia- 
tions. Smaller valve neatly ovate, with the cardinal margin very nearly straight. Beak 
reflexed close to apex of smaller valve, and having the aperture rather small. No car- 
dinal area. Cardinal angle 82°. Height 13 inches ;* length 72, H.; thickness #5 
H. Plate 1, figure 2 ; a, b,c, d, different views, natural size ; e, from another specimen ; 
f, internal structure magnified 40 diameters. 
Black Head, District of Illawarra. 
This species resembles some specimens of the T. hastata. It is more regularly ovate 
in outline, and more attenuate than that species, and either surface is quite evenly con- 
vex. In an end view, the anterior and posterior margins are nearly straight and ver- 
tical, as in fig. d; in this respect it differs from the following species. In this same view 
the outline of the larger valve appears a little flattened along the middle, or less convex 
than that of the smaller. The punctations in the internal texture are minute, and partly 
in linear series (fig. 2) They are 7}5 to gt5 of an inch apart. 
T. amygdala, Exped. Foss., Amer. Jour. Sci. il. Ser., iv. 152. 
2. TEREBRATULA ELONGATA.—Plate 1, figure 3 a, 6, different views, natural size ; 
c, d, internal structure, magnified forty diameters, natural size. District of Illawarra. 
* The shell is here supposed to be in its natural position,—the beak up, and that edge in front which 
will make the larger valve the right valve, and the smaller the left. 
