2P8 DR. J. MUEIE ON' THE OEGANIZATION OF THE CAAING "WHAXE. 



Fig. 46. Piece of the colon, displaying a pouched character : S.f/l, some of the solitary 

 glands. 



Fig. 47. A segment of the unopened bowel, intended to display the comparative narrow 

 diameter of the gut as it approaches the rectum, and the appearance of the 

 mucous folds and surrounding intestinal wall. 



Fig. 48. A portion of the rectum, cut open, showing the rugse, the narrow anal aper- 

 ture and thick sphincter ani muscle (SjpJi) in transverse section. 



PLATE XXXV. 



Fig. 49. Heart and commencement of great vessels, partially enveloped by the inflated 

 lungs. A bridge of fibrous membrane, conjoined to the diaphragm {I)), 

 unites the rear sternal angles of the lungs, and it encloses a pair of glands 

 (ffl): a small strip of the pericardium (pe) is seen above, ^a, pulmonary 

 artery ; ao, arch of aorta ; i, i*, right and left innominate trunks ; m, mammary 

 artery ; I, pulmonary lobule. 



Fig. 50. Superficial view. Segment of stemo-ventral comer of left lung, and special 

 gland, &c. i, lung covered by (jp) the pleura, which has been removed from 

 the semilunar line towards (ffl) gland, and exposing a series of convergent 

 vessels (these, a-{-v, are partly serpentine in course); phv^ phrenic vein; 

 sph, superior phrenic vessels; ph, phrenic nerve ; ])e, portion of pericardium 

 attached to (B) diaphragm. 



Fig. 51. Deep or posterior view of the parts figured in fig. 50; the internal mammary 

 vessels, however, are not shown, b, bronchus. Other letters as in the pre- 

 ceding figure. 



Fig. 52. Upper view of the septal segment of the bicuspid valve of the heart of the 

 female GloMceps, exhibiting an auxiliary valve: s, septal valve; * and the 

 arrow point to the abnormal perforation. 



Fig. 53. Interior view of the same, auriculo-ventricular opening, the under surface of 

 the septal valve, and its fleshy cords ; also the supplementary orifice and its 

 tendinous cords. One arrow denotes the blood's usual flow towards the 

 right ventricle. The second starred (*) arrow passes through the orifice in 

 the septal segment {S). cc, columna carnea ; ct, chorda tendinea, and ct*, 

 supplementary chorda tendinea belonging to the secondary valve. 



Fi^. 54. A lumbar vertebra of the Pilot Whale, to show {Sp.px) Section of the spinal 

 plexus of vessels ; the large orifice is a vein, the smaller chiefly arteries, 

 sp.c, spinal cord ; L.px, lumbar arterial plexus or rete mirabile ; c, centrum 

 of the vertebra ; t, transverse, and s, spinous process ; z, zygapophysis. 



Fig. 55. Section of intercommunicating venous network. 



Fig. 56. A transverse section of the penis of the Eazorback Whale (Physahcs anfi- 

 qiiorum, Gray, =:.Balcenoptera musculus). 



