314 THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



PLATE 18. 



FIGURE 1. Balcenoptera musculus (L.). No. 5 $ . Ventral view, showing small amount of light color on the 

 abdominal ridges. 



FIGURE 2. The same species. No. 21 S . Ventral view, showing large area of whitish color on the abdominal 

 ridges. 



FIGURE 3. The same species. No. 9 9 . Ventral view, showing large amount of light color on the abdomi- 

 nal ridges. 



FIGURE 4. The same species. No. 9 . Showing the profuse light spots on the belly. 



All specimens from Balena Station, Hermitage Bay, Newfoundland. 



PLATE 19. 



FIGURE 1. Balcenoptera musculus (L.). No. 7 $ . Ventral view, showing small amount of light color on the 



abdominal ridges. 



FIGURE 2. The same species. No. 8 S . Navel region. 

 FIGURE 3. The same species. No. 23 ? . Lateral view of the mammary fossae and pudendum, showing the 



slight projection of these parts. 



FIGURE 4. The same species. Piece of skin from the flanks, showing mottled coloration. 

 All specimens from Balena Station, Hermitage Bay, Newfoundland. 



PLATE 20. 



FIGURE 1. Balcenoptera musculus (L.). No. 8 $ . Pudendum, mammary fossae, and anus. (The mammae are 

 in the furrows which are intermediate between the median line and the external furrows.) 



FIGURE 2. The same species. No. 21 ? . Pudendum, mammary fossae, and anus ; for comparison with pre- 

 ceding figure. (The mammae are in the long furrow nearest the median line on each side) : a. clitoris ; 

 b. mammary fossa ; c. orifice of vagina ; d. anus. 



FIGURE 3. The same species. No. 11 S . Orifice of penis sheath and mammary fossae containing rudimentary 

 mammae : a. orifice of penis sheath ; b. mammary fossae. 



FIGURE 4. The same species. No. 15 $ . Ventral view, showing (a) penis sheath ; (b) mammary fossae, and 

 (c) anus. 



All specimens from Balena Station, Hermitage Bay, Newfoundland. 



PLATE 21. 



FIGURE 1. Balcenoptera musculus (L.). No. 8 $ . Pectoral fin, showing abnormal extremity. Dorsal view. 



FIGURE 2. The same. Ventral view. 



FIGURE 3. The same species. No. 21 $ . Left pectoral. 



FIGURE 4. The same species. No. 7 S . Left pectoral, showing incised extremity. 



FIGURE 5. The same species. No. 4 S . Left pectoral. 



All specimens from Balena Station, Hermitage Bay, Newfoundland. 



PLATE 22. 



FIGURE 1. Balcenoptera acuto-rostrata Lacepede. No. 20931, U. S. National Museum. Off Monomoy 



Point, Harwichport, Mass. Young. Dorsal view. 

 FIGURE 2. The same species. No. 13877, U. S. National Museum. Coast of Norway. Adult. Dorsal view. 



PLATE 23. 



FIGURE 1. Balcenoptera davidsoni Scammon. Type-skull. No. 12177, U. S. National Museum. Admiralty 



Inlet, Puget Sound, Washington. Dorsal view. 

 FIGURE 2. The same species. No. 61715, U. S. National Museum. St. Paul Island, Pribilof Group, Bering 



Sea. Dorsal view. 



PLATE 24. 



FIGURE 1. Balcenoptera acuto-rostrata Lacepede. No. 20931, U. S. National Museum. Off Monomoy 



Point, Harwichport, Mass. Young. Ventral view. 

 FIGURE 2. The same species. No. 13877, U. S. National Museum. Coast of Norway. Adult. Ventral view. 



PLATE 25. 



FIGURE 1. Balcenoptera davidsoni Scammon. Type-skull. No. 12177, U. S. National Museum. Admiralty 



Inlet, Puget Sound, Washington. Ventral view. 

 FIGURE 2. The same species. No. 61715, U. S. National Museum. St. Paul Island, Pribilof Group, Bering 



Sea. Ventral view. 



