CAMBAKUS. 65 



" A. fluviatili minor. Thorax laevis, punctatus, lateribus antice parum 

 scabris. Rostrum breve, plan urn, apice acuminatum. Clielte sex, anticis 

 majoribus, bracbiis serratis, carpis dentatis, manibus ovatis, kevibus, punc- 

 tatis, reliquiis quatuor filiformibus." 



As Dr. Barton lived in Philadelphia, the specimen sent by him to 

 Fabrieius was. probably the species now commonly known as C. Bartonii. 



Bosc's type probably came from South Carolina, as Desrnarest asserts, 

 and may have been some other species. His figure is too defective for 

 identification. 



Rafmesque's A. ciliaris, from Fishkill, Newburg, etc., N. Y., is without 

 doubt this species, and his description of A. jntsillus is probably based on 

 small specimens of the same species. It runs thus: "Antens length of the 

 thorax, rostrum oval acute, a thorn and a longitudinal angle behind each 

 eye ; three pairs of pinciferous feet, hands of the first oblong dotted, wrist 

 smooth. Obs. A very small species, living in the brooks near Saratoga, Lake 

 George, Lake Champlain, Utica, Oswego, etc. Length one or two inches ; 

 vulgar name, brook prawn, shrimp, or lobster ; entirely fulvous brown." 



Say's description was evidently drawn up from this species, although his 

 supplemental remarks on page 443, where he says it is extremely common 

 in the pine-barren marshes of the Southern States, particularly Georgia and 

 Florida, probably relate to some other species. 



Milne Edwards, misled by the transposition of the numbers of Harlan's 

 figures, has described C. ciffinis under the name of A. Bartonii ; C. Bartonii 

 (or a closely related species), under the name of A. affinis. 



The Museum of Comparative Zoology contains specimens of G. latimanus 

 from South Carolina, labelled A. Bartonii by Dr. Lewis R. Gibbes, and in the 

 collections of the Academy of Natural Sciences of Philadelphia are speci- 

 mens of C. rusticits, var. placida, also labelled A. Bartonii by the same writer. 

 The localities given by Gibbes for A. Bartonii, therefore, cannot be taken 

 as belonging to this species. 



Eriehson's types of C. Bartonii in the Berlin Museum were examined by 

 Dr. Hagen in 1870. They are a male, form II., and a young female, and 

 according to Dr. Hagen both are C. latimanus. They were collected by Caba- 

 nis in upper South Carolina. Eriehson's type of C. Carotimis, also from South 

 Carolina, appeared to Dr. Hagen to be C. Bartonii, but the description of 

 Erichson agrees much better with the species formerly referred to C. Caro- 

 linus by Hagen. 



