250 PROFESSOR TURNER'S ACCOUNT OF THE GREAT FINNER WHALE 



Figure 10. Dorsum of the beak of the foetus. The curved outline of the beak; the dorsal median 

 ridge ; the form and direction of the blow-holes, which are partially open, and the inter- 

 mediate groove are all represented. 



Figure 11. A portion of the mammary gland to show the rugose character of the mucous lining of the 

 duct, one-half the size of nature. 



Figure 12. One of the large, irregularly quadrilateral, labial, baleen plates, much reduced in size. 



Figure 13. A vertical section through the intermediate substance of the baleen, displaying its laminated 

 appearance. The subsidiary blades are shown, two of which have been cut short. On 

 the upper or palatal surface, the clefts between the lamina? of the plates, into which the 

 palatal folds of mucous membrane fit, may be seen. 



Figure 14. The baleen plates and intermediate substance of the foetus, the size of nature. One of the 

 plates, with the thin layer of intermediate substance on each side, has been partially sepa- 

 rated from the others. 



Figure 1 5. Portion of the palatal mucous membrane of the foetus. At the upper end of the figure is 

 the lip ; lower down the elongated folds for the larger labial baleen plates, and at the lower 

 end the subconical papillae from which the bristle-like subsidiary plates arise. The tubular 

 papillae are not represented in the drawing, as they had all been broken off before the 

 drawing was made. 



Figure 16. Palatal surface of a part of the foetal baleen wreath, with a side view of one of the plates. 

 The elongated clefts between the laminae of the labial plates and the polygonal pits for the 

 sub-conical papillae are shown ; as the tubular papillae are still within the blades, their 

 broken ends may be seen in part occupying the clefts and pits. 



Plate VII. 



Figure 17. Portion of the foetal membranes ; a, the non- villous surface of the chorion ; b, villous sur- 

 face. Between a and b the elongated marginal folds of the chorion may be seen. 

 e, Divided end of one of the arteries of the chorion. 



Figure 18. A large triangular fold of the chorion, displaying the reticulated arrangement of the villi on 

 its surface. 



Figure 19. Vertical section through a portion of a baleen plate to show the tubes, with the lamella- 

 and black pigment granules. x 40 diam. 



Figure 20. Transverse section through a portion of a baleen plate. The entire antero-posterior diameter 

 is represented. The tubes are divided transversely. Some are empty, others contain the 

 tubular papillae, and in some of these the transversely divided ends of the contained blood- 

 vessels may be seen. Both the tubular and cortical lamellae, with numerous black pig- 

 ment granules, are represented in the drawing. x 40 diam. 



Figure 21. Epithelial cells from the outer layers of two adjacent tubular systems. At the lower part 

 of the drawing some interstitial cells are represented. x 200 diam. 



Figure 22. Transverse section through one of the setae of a baleen plate. The shaded central portion 

 represents the soft papilla, in which a transversely divided blood-vessel is represented, 

 x 40 diam. 



Figure 2 3. Vertical section through a portion of the intermediate substance ; the clefts extending into 

 its substance, in which the intermediate papillae are lodged, are seen at the upper part of 

 the section. x 40 diam. 



Figure 24. Epithelial cells from the intermediate substance. x 200 diam. 



Figure 25. Red blood corpuscles from the blood in the vessels of the baleen plate of the B. rostrata. 

 x 1200 diam. 



Figure 26. Portion of one of the elongated folds (pulp-blades) of the- palatal mucous membrane. The 

 tubular papillae are dependent from the lower edge of the fold. Size of nature. 



Figure 27. Vertical transverse section through the pulp-blades, intermediate substance, and imbedded 

 parts of the baleen plates of B. rostrata, the blood-vessels of which have been injected ; i, 

 the vessels of the intermediate papillae; c, the vessels of the cortical papilla; t, the elongated 

 vessels of the tubular papillae. 

 Figure 28. Arch of the aorta and great vessels of the foetus, x, the ductus arteriosus ; a, right 

 coronary artery; b, brachio-cephalic ; c, left carotid; d, left subclavian; e, right carotid ;/, 

 right subclavian ; g, right posterior thoracic ; h, right axillary; i, right internal mammary ; 

 k, right cervico-facial ; and I, right internal carotid ; m, left cervico-facial ; and n, left in- 

 ternal carotid ; o, left posterior thoracic ; p and q, left axillary and internal mammary 

 arteries. 



