MUSEUM OF COMPARATIVE ZOOLOGY. 113 



butious to the literature of the subject. In the main, his conclusions 

 agree with those of Balfour. 



Though the distinctions between the canals, the ducts, and the folli- 

 cles had by a number of writers been kept prominently in sight for many 

 years, Professor Agassiz was the first to attempt the use of the canal 

 system as a basis for homologies, as an aid in classification, or as a means 

 of tracing affinities, purposes for which it is admirably adapted. 



LITERATURE. 



N. Stenonis. 



De Musculis et Glandulis observationum specimen cum duabus epistolis 



quarum una ad Guil. Pisonum de anatome Rajae, etc. Amst., 1664. 

 Elementorum Myologiee specimen ; accedit Canis Carchariae caput dissectum, 

 et dissectus piscis e Canum genere. Amst., 1669. 

 S. Lorenzini. 



Osservazioni intorno alle Torpedini. Firenze, 1678; Lond., 1705, Angl. 

 Miscellanea curiosa s. Ephemeridum medico-pliysicorum, Ann. IX. et X., 



p. 389; in Miscell. Acad. Nat. Cur., Dec. Ami. IX. et X., obs. 17. 

 Schneider's Sammlung von anatom. Aufsatzen und Bemerkungen zur Auf- 

 klarung der Fischkunde, Tb. I. p. 93, fig. 

 G. Blasius. 



Anatome Animalium. 1681. De Cane Carcharia, p. 264, from Stenonis. 

 M. B. Valentini. 



Ampbitbeatrum Zootomicum. 1720. 

 Perrault. 



(Euvres diverses de Physique et Mechanique. 1721. Vol. II. 

 A. Monro. 



The Structure and Physiology of Fishes. 1785. 



Vergleichung des Baues und der Physiologie der Fiscbe. 1787. Schneider's 

 Translation. 

 P. Camper. 



In Schneider's Translation of Monro's work, pp. 16-19. 1787. 

 E. Geoffroy St. Hilaire. 



" Sur l'anatomie comparee des organes electriques de la raie torpille, du 

 gymnote engourdissant, et du silure trembleur." In Ann. du Mus., I. 

 p" 392. 1801. 

 L. Jacobson. 



"Extrait d'un Memoire sur un organe particulier des sens dans les raies et 

 les squales." In Nouv. Bull, des Sciences, par la Societe Pbilomatique de 

 Paris, 1813, VI. p. 332. 



VOL. XVII. — NO. 2. 8 



