21M5 REFERENCE TO PLATES. 



Plate 4. 



1. Digestive system of Octopus octopodia. Keferstein, t. 116, f. 2.. 29 



in b. Buccal mass, g b. Lower buccal ganglion, s'. Pos- 

 terior salivary glands. 7i. Liver. o e. Alimentary canal. 

 d h. Biliary duct. i. Intestine. a. Anus, b i. Ink-bag. 

 g s p. Splanchnic ganglion, v. Stomach, v'. Blindsack. 



2. Medial section of the buccal mass of Sepia officinalis. Kefer- 



stein, Klassen und Ordiiungen, t. 116, f. 4 29 



m b c. Buccal membrane, m I. Lip. m x s. Upper jaw. 

 m x i. Under jaw. x. So-called organ of taste, o e. Opening 

 of alimentary canal, rd. Radula. z. Tongue sheath, s'. Sali- 

 vary gland, g I. Superior buccal ganglion, g b. Lower buccal 

 ganglion. 



3. Tongue of Argonauta Argo, enlarged. Fer. and Orb., Ceph. 



Arg., t. 1, 4 ter., f . 8 29 



B. The tongue, viewed dorsally. a. The teeth in seven 

 rows. b. The outer rows of plates. 



4. Beaks of Sepia officinalis surrounded by the lip 29 



5. 6. Octopus octopodia. Tongue, profile (5) and face (6) view. 



d'Orbigny, Moll. Viv., t. 1. f. 8, 9 29 



7. Section through the radula of Nautilus Pompilius 29 



8, 9. Tongue and dentition of Argonauta Argo, dorsal and profile 



views. Fer. and Orb., Ceph. Arg., t. 1, f. 3, a, & 29 



Plate 5. 

 Lingual Dentition 29 



1. Octopus punctatus, Gabb. Dall. Proc. Calif. Acad., iii, 243, f. 27. 



2. Octopus macropus, Targioni. Bull. Mai. Ital., ii, t. vi, f. 5. 



3. Parasira catenulata, Targioni. 1. c., t. 6, f. 4. 



4. Octopus vulgaris, Troschel. Archiv fur Naturg., t. 1, f. 2, 1853. 



5. Loligo Mediterranea, Targioni. 1. c., t. 7, f. 3. 



6. Argonauta Argo, Troschel. Ibid., f. 4. 



7. Onychoteuthis Bergii, Troschel. Ibid., f. 6. 



8. Tremoctopus Carense, Troschel. Ibid., fig. 3. 



9. Onychoteuthis Owenii, Targioni. 1. c., t. 7, f. 4. 



10. Eledone cirrosa. Kongl. Vetensk. Foreh., t. 3, 1847. 



11. Loligo marmorse, Targioni. 1. c., t. 7, f. (I. 



12. Eledone moschata, Troschel. Ibid., fig. 1. 



13. Loligo Hartingii, Verrill. Am. Jour. Sci. N. S., ix, t. 4, f. 8, 



1875. 



Plate 6. 

 Lingual Dentition 29 



1. Loligo vulgaris, Kongl. Vetensk. Foreh., t. 3, 1847. 



2. Ommastrephes sagittatus, Troschel. Ibid., t. 1, f. 5. 

 :>. Sepiola Rondeletti, Targioni. 1. c., t. 7, f. 8. 



4. Loligo pallida, Verrill. Am. Jour. Sci. N. S., ix, t. 4, f. 7, 1875. 



5. Nautilus pompilius, Keferstein. T. 1.15, f. 3. 



('.. A rchiteuthis monachus, Verrill. Am. Jour Sci. N. S., ix, t. 4, f. 

 6, 1875. 



In A. J. Sc., xii, 236, Mr. Verrill says that this is not an 

 odontophore, but a specialized chitinous lining of the mouth or 

 pharynx, covered with sharp teeth and granules. The true 

 odontophore is about 70 mill, long and 1 V 3 mill, wide, has seven 



