EEPOET ON THE AMPHIPODA. . 99 



2mlex, as Latreille supposed. In full accordance witli Boeck's account of this paper, Liitkcn 

 says that the figure and description given of the exterior of the animal are good, the account 

 of the mouth-organs very incomplete, and the contributions to the knowledge of the internal 

 structure, if on the whole correct, not very far-reaching. 



1817. Latreille, P. A. 



Le Efegne animal, distiibue d'apres sou organisation, pour servir de base h 

 I'histoire uaturelle et d'iutroduction a I'auatomie comparee. Par M. le Ch'"'. 

 Cuvier. Avec Figures, dessinees d'apres nature. Tome III. contenant les Crustaces, 

 les Arachnides et les Insectes, Par M. Latreille, de I'Academie des Sciences, &c. A 

 Paris, 1817. (pp. 44-53.) 



Latreille here divides the class of Crustacea into five orders — Decapods, Stomapods, Amphipods, 

 Isopods, and Branchiopods. In regard to his order of Amphipods, after giving a general 

 description of the structure and habits, he says we might embrace this order under the 

 generic name of Gammarus. He then proceeds to distinguish Les Phronimes [Phronima, 

 Latr.), les Chevrettes {Gammarus, Lat.), which include, with various characteristics, les 

 Leucotlioes and les Dexamine of Leach, les Melite, les Mserza, the Chevrettes, properly so- 

 called, or Gammarus, les Phernsa and les Ampliitoe, all of Leach, and la Cheireffe des 

 ruisseaux of Geofiroi. These are followed by les Talitres (Talitrus, Latr.), which, he says, 

 Leach subdivides into his Afyles, Talitres, and Orchesties. Finally, les Coropldes 

 (Corophium, Lat.) are mentioned, with Cancer grossipes of Linnseus for the type, and to this 

 group he refers "les Podocera et les Jassa de M. Leach." 



The Isopods he divides into three sections, according to the form and position of the branchiae. 

 The first section, les Cystibranches (compare page 95), contains the genera Leptoinera, 

 Latr., and Proto, Leach, wliich are in fact identical, CapreUa, Lam., and Cyamus, Lat., with 

 Larunda, Leach, given apparently as an alternative name. In the second section, the 

 Phytibranches, Ty pin's, Eisso, is included with other genera usually reckoned as Isopods. 

 The third section, the Pterygibranches, contains only Isopods. In a note on page 7, he 

 recognizes that the branchiae in Cyamus, CapreUa, and Proto were not thoroughly under- 

 stood, but makes a good guess as to their true position. 



1817. Rafinesque-Schmaltz, C. S. 



Synopsis of four New Genera and ten new Species of Crustacea, found in the 

 United States. The American Monthly Magazine and Critical Review. Vol. ii. 

 New York, 1817, pp. 40-43. 



The portion of this paper apparently referring to the Amphipoda is as follows : — 

 " III. PsAMiiYLLA. (N. Order Branchypia, N. Family Gammaria.) The two upper antens, 

 with two long segments at the base, and many small articles at the top ; lower antens very 

 short ; all the feet with one nail, the last pair much longer and larger : each segment of the 

 body with a lateral appendage, tail with four bifid unequal filaments. — Obs. The name is 

 abbreviated from Psammopsylla, which means sand-flea. The family Gammaria is the 

 fifteenth in my natural classification, and is distinguished by fourteen feet, four antens, body 

 not depressed, etc. 



