NOTES ON THE SALMO SALAR SPECIMEN — MORROW. 179 



1-5. The 1st, 2nd, 3rd, 4th and oth fin rays are slightly sepa- 

 rated from each other. 



5 <fb 0. Between 5 and 6 there is nearly £ inch of space. 



6 £• 7. Between 6 and 7 a little more, say \ inch of space. 



7 & 8. Between 7 and 8 a little more than \ inch of space. 



8 & 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 <L- 12. Touch but are not united, and are therefore separate 

 rays. 



Ventral Fins. 

 These fins are attached to two bones which are embedded 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 

 called the pelvic bones, which in this specimen are 3^ inches in 

 length, 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 is a ridge increasing a little in size 

 until it is about £ of an inch in thickness, rounded on its dorsal 

 aspect and projecting rather more than ^ 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 f 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 to be united. 



6 



