828 PROCEEDINGS OF THE ACADEMY OF [May, 



made collections principally in California, Dr. Hammond in Kan- 

 sas and Mr. Powel in Rhode Island. In the West Indies Dr. Van 

 Rijgersma collected at St. Martins, Dr. Griffith in St. Croix and 

 Dr. H. C. Wood in New Providence. Dr. Hering collected fishes 

 in Surinam and Dr. Ruschenberger at Rio Janeiro and various 

 other localities. Many of the most valuable additions were pre- 

 sented by the Smithsonian Institution, among which are a series 

 of typical examples, mostly Catostomidse and Cyprinidae. The 

 explorations in the west and southwestern regions of tlie United 

 States secured many novelties described by Dr. Charles Girard and 

 Prof. S. F. Baird. 



The most extensive and numerous contributions are due to the 

 exertions of Prof. E. D. Cope. Collections from the Kanawha, 

 Holston and Roanoke rivers included large series of species with 

 many types. His entire alcoholic collection was bequeathed to the 

 Academy, including many fresh -water fishes from the upper 

 Amazons, made by Prof. James Orton and John Hauxwell. 



The fishes obtained in the province of Rio Grande do Sul, Brazil, 

 should be mentioned, as they are the basis of Cope's last im- 

 portant contribution to South American ichthyology. His other 

 noteworthy collections are from Pennsylvania, North Carolina, 

 Texas and Florida. 



In the present paper it is intended only to treat of the Marsi- 

 pobranchii, Selachii and Ganoidei, and it is believed that refer- 

 ences to all the typical representatives of these groups that are pre- 

 served in the collections are included. 



I have appended rather rough descriptions of the alimentary or 

 enteric canal to most of the species fit for dissection, which are 

 represented by duplicates. 



To the authorities of the Academy I am much indebted for per- 

 mission to make these dissections from duplicate specimens. 



PETROMYZONID^. 



1. lohthyomyzon concolor (KirUund). 



Ammoc(£tes concolor Kirtland, Bost. Journ. Nat. Hist., Ill, 1841, p. 

 473, PI. XXVII, %. 1. 



No. 354. Type of Ammoaeies mpytera Abbott, Proc. Acad. 

 Nat. Sci. Fhila., 1660, p. 327. Ohio river. Dr. Hildreth. 



As I am unable to determine this larval specimen satisfactorily, 

 I have followed Profs. Jordan and Evermann in provisionally 



