DE. J. IVrmUE ON THE ORGANIZATION OF THE CAAING WHALE. 295 



Fig. 13. A deep dissection of the hyo-laryngeal region seen laterally. On the left 

 moiety, that towards the observer, the mucous and subjacent tissues have 

 been cut away, bringing several of the small muscles into sight. 

 An arrow, partly in dotted line, denotes the floor of the pharynx, leading to the oeso- 

 phagus, m; two other short arrows indicate the canal of the glottis to the trachea, 

 cut short ; A, arytenoid cartilage ; ep, epiglottis ; phv, pharyngeal valley and ridge ; 

 E.e, hyo-epiglottio muscle ; Sqs, squamo-styloid ; Ar, arytenoideus ; Cap, crico-aryte- 

 noideus posticus ; Cal, crico-arytenoideus lateralis ; Tar, thyro-arytenoideus ; ic, 

 inferior comu of thyi-oid cartilage ; I, thyro-hyoid ligament ; Ih, interhyoideus ; sh, 

 stylo-hyal bone. 

 Fig. 14. Semidiagrammatic and much reduced sketch of the hyoidean arch, and the 



larynx from below, of the Pilot Whale. 

 sh, stylohyal ; ch, ceratohyal ; bh, basihyal ; th, thyrohyal ; I, the thyro-hyoid liga- 

 ment, anterior et lateralis; T, thyroid cartilage: the latter is placed between the 

 body and right ala ; i.c, its inferior comu ; C'*, cricoid comu ; tr, trachea. 

 Fig. 15. Upper or pharyngeal surface of the same, and showing the oblique inclination 

 of [ep and A) the aryteno-epiglottid projection ; c, broad portion of cricoid 

 cartilage ; I <& ic, as in fig. 14. 

 Fig. 16. An outline of the thyroid bones in profile. Letters as in fig. 14. 



PLATE XXXII. 



Figures 17-24 inclusive are a series of perpendicular sections of the dorsal fin, cut at 



points corresponding to the dotted lines, nos. 1—8, in fig. 25. 

 Fig. 17. Perpendicular and transverse section of the anterior portion of the dorsal fin, 



viz. 19 inches distant from its tip. 

 Fig. 18. Another segment, nearer middle, 13 inches fi-om point. 

 Fig. 19. Another segment, 7*5 inches from tip: a, artery. 

 Fig. 20. Another segment, 6'2 inches from tip. 

 Fig. 21. Perpendicular section of the same fin, close to the posterior concavity, and 



4'5 inches in front of the hinder point of fin. 

 Fig. 22. Section, free part of fin, 4 inches in advance of tip. 

 Fig. 23. Another slice, 3'2 inches in advance of tip. 

 Fig. 24. Another slice, 1'25 inch in advance of tip. 

 Fig. 25. Miniature outline of the fin of the back, representing by numerals (1-8) and 



dotted lines the positions where the slices, figs. 17-24, have been cut from. 

 Fig. 26. Skull of Glohiocephalus melas, mandible attached. Also the right half of the 



great nasal protuberance, exhibiting its structure in mesial section and part 



of the narial passage and lower pouch. 

 Bl, blubber ; fa, fibro-areolar glistening tissue ; p, right premaxillary sinus, partially 

 hidden by the fatty mass ; arrow directed into blow-hole. 



