162 NOTES ON SALMO SALAR SPECIMEN—MORROW, 
Art. VII—Nores oN THE BONES OF SALMO SALAR SPECIMEN 
FROM Laprapor. By R. Morrow. 
Read April 19th and May 10th, 1830, 
Spinous Rays, §c. BEGINNING at the junction of the dorsal 
ridge with the occiput there is a bony process in advance of the 
first spinous ray} flattened vertically, scmewhat broader above, 
but stouter below, it is attached to the dorsal region by stout 
fibrous tissue, its ventral extremity at about midway to the Ist 
spinous ray, and it is the first interspinous bone ;* it is entirely 
different in form, from its representative in the ubiquitous perch, 
and were it cut out and looked at merely as a fish bone, few 
would recognize it as an interspinous bone, from the deseription 
of such bones as usually given. 
2&0. The 2nd & 3rd spinous rays have each a short interspin- 
ous bone attached to their extremities, overlapping posteriorly. 
4, This ray is without the intersp. bone.t 
5, ‘The 5th spinous ray has its interspinous bone overlapping in 
front, and rather longer than those belonging to 2 & 3. 
6—15, All these sp. rays have their intersp. bones overlapping 
anteriorly, but the 15th spinous ray curves posteriorly rather 
more than Nos. 12,13 & 14, and at the 15th sp. ray there is an 
extra interspinous bone % (making 2 bones, 4%) which does not 
reach, but its end is opposite the front of the 15th spinous ray, 
distant about one-quarter of an inch from it; it does not rise so 
high in the dorsal region as the other interspinous bones, say 4 
of an inch less than 1 (1%; lies immediately behind 4, from which 
it is distant about } an inch); 4 and the preceding intersp. bones 
are nearly equidistant from each other; 4 is very nearly a 
straight bone, tapering slightly from its dorsal to its ventral ex- 
tremity. The dorsal ends of the 14 interspinous bones have 
somewhat broad heads; for the attachment of the muscular tissue, 
and all are curved anteriorly. 
16. This spinous ray is without an intersp. bone, but the 
4th intersp. fin bone of the dorsal is slightly in front of it. 
*1n younger specimens this Ist intersp. bone has almost always its ventral extremity lying be- 
tween the superior extremities of the lst spinous ray; as this ray becomes more solid, the intersp. 
bone seems to be pushed out. 
tIn a fish from Cape Breton the 4th has an interspinous bone, but the 6th is without, 
More perceptible in smaller specimens, 
