280 



DR. J. MUBIE ON THE OEaANIZAI ION OF THE CAAING WHALE. 



pubo-coccygeus goes to the chewon bones as far as the sixtieth vertebra. Sacro- 

 coccygeus, muscular to forty-fifth, tendons to sixtieth ; between these points the secon- 

 dary tendons which form the sheath, emerge. Supracaudal from fortieth to sixty-sixth 

 vertebra ; the infi-acaudal is from two to three vertebrae shorter. Longissimus dorsi &c. 

 narrows at sixtieth ; two oblique tendons given off at thirty-seventh ; the others behind, 

 ere producing aponeurotic sheath. The spinalis dorsi &c., its final tendons inserted 

 from the sixty-fourth to the seventieth vertebral diapophyses. 



Fig. 6. 



Manner in which the fleshy imbedded inner deep tendons of the longissimus, &c., are distrilmted to the spine 



in Cetatea. 



SpJ-^Lci, conjoined spinalis dorsi and levator caudre internus, hooked upwards just posterior to the oblique bridging tendons 

 from {Ld+Lce) the longissimus dorsi and levator caudie estemus ; Sr, sacro-coccjgeus, part of its constituent subsheathing 

 tendon also dragged apart. Sketched from a dissection of PIioc(??ia communis. 



A series of levatores costarum, of moderate stiength, and passing from the transverse 

 processes to the ribs, exists in all the species of Whales 1 have dissected'. 



In the lumbar region of G. melas the intertransversales" are powerful ; they diminish 

 in strength forwards, and can barely be detected in the most anterior dorsals and 

 cerncals. In L. albirostris, whilst fleshy, they are shorter, owing to the close approxi- 

 mation of the very numerous and long divergent transverse processes. In P. communis 

 caudally they are tendinous ; in the lumbar region, semitendinous and fleshy, a superior 

 and inferior division is noticeable. 



According to the development of the neural spines, cervical, dorsal, lumbar, and 

 caudal, so are the interspinales^ strong or weak. But as a series of muscular bundles 

 they are, I believe, present in every Cetacean. They have been met with by me in 

 five genera. 



Both Rapp^ and Stannius' have described in the Porpoise a set of muscles linking 

 together the chevron bones. They name these M. interspinales inferiores. They are 



' Described also by the oft-quoted German authorities. 

 * The m. interspinales superiores of the preceding writers. 



The intertransversarii of the foregoing. 

 * Op. cit. p. 83. ' L. c. p. 40. 



