180 NOTES ON THE SALMO SALAR SPECIMEN — MORROW 



fin-rays are attached. The outer head of the transverse ridge 

 projects a little beyond the lateral ridge, the space so formed 

 being filled with cartilaginous matter from which springs 

 ligamentous attachment running some distance along and tying 

 this bone with the muscles of the belly. On the inner edge 

 of the bony blade and attached to the cartilage on its anterior 

 edge, strong fibrous tissue passes enveloping the blade as well as 

 the anterior ends of the lateral ridge, from thence passing to the 

 general muscular tissue. A similar attachment passes posteriorly 

 from the cartilage between the pelvic bones, having attachment 

 to the inner ends of their transverse ridges, with divergent- 

 connection to the integument covering the rays immediately 

 under the point where the inner fin-rays appear upon the surface 

 of the fish, from thence continuing some distance as a strong 

 band down the centre of the belly. The pelvic bones are not 

 always parallel with a line drawn through the centre of the belly. 

 but are occassionally somewhat distorted, that is each forming a 

 different angle with such central line. 



The ribs from and including No. 15 & 22 are shorter in pro- 

 portion than the others ; this is in order to allow for the insertion 

 of the pelvic bones, thus preserving the line of beauty. The space 

 so afforded by the shortening of these ribs is 4 inches in length ; 

 (that is from the end 14 to 22,) the length of the pelvic bones 

 being 3| inches, and from them to the extreme posterior end of 

 the long fin-ray is 3f inches, making a total length of the fins 

 and their attachments 6§ inches average, allowing for the over- 

 lapping of the fin-rays upon the pelvic bones. It must however be 

 borne in mind that the fin-rays owing to their curves; are of 

 eccentric lengths, there being a difference in the measurements 

 as they are taken from the dorsal or ventral aspects ; in the 

 lengths above I have taken the dorsal aspect in a straight line (not 

 round the curve of the ray), the measurement of the ventral 

 aspect of the same ray is 3| inches. 



The ventral fins each contain 9 rays and each fin has a ven- 

 tral appendage, in this case they are 1| inches in length. 

 1st. The first or outer ray divides at 1\ inches from its attachment 

 to the pelvic bones (that is visibly) ; on its central aspect it is at- 



