116 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



1850. Costa, Oronz. Gabriel. Storia eel Anatomia dell' ADguilla e 

 Monografia della nostrali Specie di questo Genere. Kaples, 

 1850. 40, with 9 plates. 



1859. VoGT, Carl. " Kunstliche Fisclizuclit." Leii)zig, 1859. 

 [Refers to the inouutiug of the young eels in France, p. 52.] 



1861. CosTE, p. Voyage d'Exploration sur le Littoral de la France et 

 de ritalie. Paris, 18G1. 



[On p. 49 Coste discusses the peculiar supjjoaed sterile forms, known 

 in Comacchio by the name " Pascente."'} 



1863. SiEBOLD, Carl Theodor Ernst von. Die Siisswasserfische 

 Mitteleuropas. Leipzig, 1863. 



[In this work, pp. 348-352, von Siebold suggests the idea that the seden- 

 tary eels of the inland waters were permanently sterile individuals. He ad- 

 mits that the eels may reproduce either by parthenogenesis, by copulation, 

 or that they may even be hermaphrodites. ] 



1866. Desmarest, M. <Eevue et Magazin de Zoologie, 1866, pp. 161- 



165. 



[ Observations on an eel kept in a tank of water for the last thirty-seven 

 years. ] 



1867. Jacoby, L. Ueber deu Kuocheubau der Oberkinnlade bei den 



Aalen. < Inaugural dissertation of L. Jacoby, witb 8 plates. 

 Eepriuted in Giebel & Sieweit's Wissenscliaftliche Zeitschrift, 

 Sept. and Oct., 1867. Halle, 1867. 



[CoucerniDg the bony structure of the upper jaw of the eel.] 



1872. Ercolani, Giovanni Battisto. Del Perfetto Ermafroditismo 

 delle Anguille. < Mem. dell' Academia delle Scienze di Bo- 

 logna, 1872, p. 529. ■* 



[In this paper "Upon the perfect hermaphroditism of eels," Ercolani 

 maintained that the snaky-like folds of fat formerly noticed near the ovary 

 were nothing else than the true sperraaries of the eel, and that upon the left 

 side of the animal the spermary developed into a true testicle, while the one 

 upon the right side shrunk up and became functiouless. The spermatozoa 

 (supposed) observed by him have been pronounced by Syrski and others 

 to have been founded on a false interpretation of the molecular movement 

 of the fat particles. ] 



1872. Baird, Spencer F. Generation of Eels. < Annual Record of 

 Science and Industry, 1872 (1873), p. 299. 

 [A review of Ercolani's paper. ] 



1872. Crivelli, Balsamo, and Maggi, L. Intorno agli Organi Essen- 

 ziali della Eeproduzione delle Anguille. < Mem. del Instituto 

 Lombardo di Scienze e lettere a Milano, xii, 1872, pp. 229-240, 

 with plate; Wiegmanns Archiv fiir Naturgeschichte, 1, 1872, 

 p. 59 (German translation). Review by Canestrini, Atti Soc. 

 Padua, i, 1872, pp. 70-74. 



[In this paper, read fourteen days later than that of Ercolani, the authors, 

 like Ercolani, considered the folds of fat nest to the ovary to be the male 

 organs. While they, too, advocated the hermaphroditism of the eel, they 

 maintained that the active male organ was located upon the right side of 

 the animal. They described spermatozoa (supposed) found by them in this 

 organ.] 



