16 BULLETIN : MUSEUM OF COMPAriATIVE ZOOLOGY. 



ment deorite vers la fin de 1831 et pendant les huit premiers mois de 

 I'annee 1832, et j'ai iuscrit mes determinations sur le revei's de toutes 

 les plaques." ^ 



The total number of species recognized by Agassiz as the result of his 

 investigations of the Gazola Collection and other Bolca material that 

 came under his observation was 127, and the total number of genera 77. 

 Many of Volta's types were refigured by liim, but in several cases 

 descriptions were given without fresh illustration, and in others Yolta's 

 figures were merely renamed without further description. Some con- 

 fusion in the nomenclature was occasioned by reason of other names 

 being applied to species which had been duly established both by Volta 

 and by de Blainville, and in about a dozen instances ]\IS. names were 

 proposed for cei'tain forms which up to the present time have remained 

 undescribed. These tyi)es inedits, designated as such in Agassiz's hand- 

 writing, have recentl}'' been investigated by the present writer, and their 

 publication undertaken by the French Geological Society. It must not 

 be supposed, however, that all of Volta's types which originally formed 

 part of the Gazola Collection are now preserved in the Paris ^Museum, 

 nor was it possible even in Agassiz's time to account for the specimens 

 which were then missing.^ Owing to the historic and scientific interest 

 attaching to these originals, it is to be hoped that all such as are still in 

 existence and have escaped notice amongst other collections may again 

 come to light. Lists are given below of all the types and hypotypes 

 belonging to the Gazola Collection in Paris. 



It will be sufficient to pass over the poat-Agassizian literature of 

 the Bolca fish-fauna very briefly, merely indicating the names of the 

 principal contributors. These are, in clironological ordei', Jacob Meckel, 

 Rudolf Kner, Franz Steindachner, Ratfaele Molin, Abramo Massalongo, 

 Paolo Lioy, Achille de Zigno, Francesco Bassani, Wladislaw Szajuocha, 



1 Agassiz, L., Poissons Fossiles, L p. 5. Neuchatel, 1833. 



2 The Library of the Museum of Comparative Zoology possesses the identical 

 copy of Volta's work employed by Professor Agassiz in his determinations of the 

 types in the Gazola Collection at Paris. Eacli figure of the plates is marked with 

 Agassiz's revised designation, and in cases where the originals were wanting, the 

 fact is so indicated. His private cop}' of de Blainville's Poissons Fossiles, in 

 the same library, likewise contains valuable corrections and annotations. The 

 Museum has received tlirough Prof. K. T. Jackson, who obtained it from Prof. 

 J. E. Wolff, a specimen which formerly belonged to the Gazola Collection at Paris, 

 but which disappeared from it probably during some of the early vicissitudes through 

 which the collection passed. Several interesting notices of the latter are to be found 

 in the papers of Faujas-St.-Fond, de Jussieu, Cuvier, and others, published in the 

 early volumes of the Annales and of the Me'moires du Museum d'Hisioire Naturelle. 



