FISHES OF THE CHALK. 
139 
of teeth, and the obtuse form of the liead, separate 
it, however, from all the recent species. 
SALMO ? LEWESIENSIS. 
ay a detached scale. 
In a remarkable specimen, the back of the ani- 
mal is imbedded in the chalk, but the abdomen, 
head, &c. are distinctly exposed. This fish lies four 
inches in relief, is nine inches long, 2v5 inches wide 
between the pectoral fins, and one inch between the 
ventral ; the latter being placed three inches below 
the former. The relative situation of these parts may 
probably have been altered, but the specimen is so 
little distorted, that the difference cannot be mate- 
rial. The head is considerably mutilated ; it exhibits 
])ortions of the jaws, temporal bones, the plates of 
the opercula, and ten or eleven branchiostegous 
rays on each side ; the latter are spread out from 
beneath the opercula, and meet under the lower 
jaw. Both the pectoral fins are preserved ; the 
riii’ht one remains in its natural situation ; the other 
is displaced and partly covered by the gills ; each 
is composed of seven or eight rays. The ventral 
fins consist of six or seven rays, and are partially 
separated from the body of the fisli. A dorsal fin 
