182 NOTES ON THE SALMO SALAR SPECIMEN — MORROW. 



also close to the heel of No. 7 giving a crowded appearance to 

 the last three rays, which are attached by strong fibrous tissue 

 to the dorsal side of the inner ventral heel or broad plate of No. 

 9, which is turned inwards towards the outer side of the fin in op- 

 position to the heels of the other rays (it being the only ray having 

 this peculiar form) ; this broad plate is in its turn attached to the 

 stout transverse process of the pelvic bone upon which its ventral 

 surface moves ; in addition to this broad plate it has upon the 

 ventral side the usual termination. The rays No. 2. to and in- 

 cluding 8 are nearly of the same shape. 



Ventral aspect, Ventral Jin. 



Here the rays, may, at their anterior ends be said all to curve 

 towards the centre of the fish. 



1st ray. The curve of the first ray fits upon the ventral aspect 

 of the enlargement or head of the outer edge of the pelvic bone 

 having very strong ligamentous attachment. 

 2nd. The second has the same attachment, its curved end ter- 

 minating on the inner edge of the ventral aspect of the outer 

 head of the pelvic bone. 



3-9. The remaining rays have all a similar attachment, their 

 anterior curves becoming less, until No. 9 is almost straight, and 

 the ends of all gradually receding. 



The dorsal heel of the 2nd ray is opposite to its ventral ex- 

 tremity, but the other rays gradually recede on the dorsal side 

 until the anterior extremity of the 9th ray ventral aspect is one 

 quarter of an inch in advance of the dorsal side of the same ray. 



When the ventral fins are in motion or extended, all the an- 

 terior ends of the fin- rays appear closely crowded together, more 

 so on the ventral than upon the dorsal aspect. 



You may perhaps remember that in describing to you the dor- 

 sal aspect of the spinal column, your attention was drawn to two 

 bones lying above the 57th centrum, covering it together with 

 the 58th and 59th and partially that which may be called the 60th 

 centrum, leaving on the dorsal aspect three centra unprovided 

 with spinous processes ; on the ventral aspect your attention was 

 also directed to a conical process different from all the other 

 spinous processes which I said together represent in my view the 



