MUSEUM OF COMPARATIVE ZOOLOGY. 113 



butions 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. 



Be Musculis et Glaudulis observationum specimen cum duabus epistolis 



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

 Elementorura Myologiae specimen ; accedit Canis Carcharise caput dissectum, 

 et dissectus piscis e Cauum genere. Amst., 1G69. 

 S. Lorenzini. 



Osservazioni intomo alle Torpediui. Pirenze, 1G7S; Loud., 1705, Angl. 

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



p. 3S9; in Miscall. Acad. Nat. Cur., Dec. Ann. IX. et X., obs. 17. 

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

 klarung der Pisclikuude, Th. I. p. 93, fig. 

 G. Blasius. 



Anatome Animalium. 1G81. De Cane Carcharia, p. 264, from Stenonis. 

 M. B. Valentini. 



Ampliitlieatrum Zootomicum. 1720. 

 Perrault. 



CEuvres diverses de Physique et Mechanique. 1721. Vol. II. 

 A. Monro. 



The Structure and Physiology of Fishes. 1785. 



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

 Translation. 

 P. Camper. 



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

 E. Geoffroy St. Hilaire. 



" Sur ranatomie comparee dcs organes e!ectriq\ies de la raie torpille, du 

 gymnote engourdissaut, 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 Philomatique de 

 Paris, 1813, VI. p. 332. 



VOL. XVII. — NO. 2. 8 



