NOTES ON THE SALMO SALAR SPECIMEN—MORROW. 179 
¥-5. The Ist, 2nd, 3rd, 4th and 5th fin-rays are slightly sepa- 
rated from each other. 
5 &6. Between 5 and 6 there is nearly § inch of space. 
6&7. Between 6 and 7 a little more, say s inch of space. 
7&8. Between 7 and 8 a little more than ; inch of space. 
&&9. Between 8 and 9 a full -of an inch of space, just below 
their articulation. 
9& 10. Between 9 and 10 not quite ; of an inch of space. 
10 & 11. Between 10 and 11 just perceptibly more than between 
nine and ten. 
11 &12. touch but are not united, and are therefore separate 
rays. 
Ventral Fins. 
These fins are attached to two bones which are imbedded in. 
the strong fatty muscular tissue in the belly of the fish. They ap- 
pear on its surface opposite at right angles to the 12th dorsal ray, 
and are attached to the two bones already referred to, commonly 
ealled the pelvic bones, which in this specimen are 31 inches in 
Jength, measured from the centre of the left bone to its point or 
termination of its junction with the bone of the right side to 
which it is united* by, cartilage, forming a somewhat rounded 
termination. For convenience I will take one, the left of these 
bones. You will notice at once its peculiar shape, its posterior end 
has a stout transverse ridge; extending and springing from this 
laterally on its outer edge isa ridge increasing a little in size 
until it is about 3 of an inch in thickness, rounded on its dorsal 
aspect and projecting rather more than j, of an inch above a thin 
bony plate ; of an inch in breadth at its posterior extremity; de- 
creasing anteriorly to a point which is united to the transverse 
ridge as far as its inner end, and extending along the lateral 
ridge two inches, this lateral ridge being prolonged anteri- 
orly { of an inch beyond the thin plate or blade. On the 
ventral aspect the plate or blade rises, following the curve of 
the lateral ridge which in consequence does not show any 
abrupt projection. The posterior end of the bone or transverse 
ridge is, in this specimen, one inch in breadth, and to it the 
*In young specimens they can scarcely be said $0 be united. 
