CAMKARUS. 87 



vania: Brandywme Creek (Coll. Acad. Nat. Sci. Phila.); Schuylkill (Coll. 

 Acad. Nat. Sci. Phila.); Reading (Girard) ; Philadelphia (Coll. Acad. Nat. Sci. 

 Phila.); Bristol; Susquehanna River (Coll. U. S. Nat. Mus.) ; Bainbridge 

 (Coll. U. S. Nat. Mus.); Carlisle. Maryland: Cecil Co.; Havre de Grace, 

 Harford Co. ; Guynn's Falls, Druid Hill, etc., Baltimore Co. (Coll. P. R. 

 Uliler ) ; Anne Arundel Co. (Coll. P. R. Uhler) ; Montgomery Co. ; Charles 

 Co., Potomac River (Coll. P. R. Uhler); Williamsport, Washington Co. 

 (Coll. P. R. Uhler); Cumberland, Alleghany Co. District of Columbia: 

 Washington, Potomac River (Coll. U. S. Nat. Mus.). Virginia: Cunston, 

 Potomac River, Fairfax Co. (Coll. U. S. Nat. Mus.). Lake Erie (Coll. Pea- 

 body Acad. Sci.). Lake Superior (Coll. Bost. Soc. Nat. Hist.). 



Rafinesque's description of Astacus limosus is as follows : - 



" N. Sp. Astacus limosus. Antens length of the thorax, rostrum equal 

 to their peduncle, one-toothed on each side, canaliculated at its base ; a 

 thorn above the eyes, another on each flank, three pairs of pinciferous feet, 

 bearded at their articulations, hands short, smooth, unarmed. Obs. I dis- 

 covered this species in 1803, and observed it again in 1816, in the muddy 

 banks of the Delaware, near Philadelphia ; vulgar name, mud lobster ; length 

 from three to nine inches ; good to eat ; commonly brown, with an oliva- 

 ceous tinge." 



From the habitat it is probable that this imperfect description refers to 

 the species well described in the following month by Say under the name of 

 A. affinis, as assumed by Girard and Hageu. 



A dry male specimen in the Academy of Natural Sciences of Philadelphia, 

 No. 127 b , "Schuylkill. Dr. Harlan," is probably Harlan's type. 



Milne Edwards, apparently misled by the transposition of the numbers 

 of Fig. 2 and Fig. 3 on Harlan's plate, has described this species as Astacus 

 Bartonii ; A. Bartonii as A. affinis. 



Erichson's type, a female, in the Berlin Museum, was examined by 

 Hagen in September, 1870. The specimen is stated by Erichson to have 

 been collected in Carolina by Cabanis. The label only gives America lorcnlis. 

 Dr. Cabanis assured Dr. Hagen that he collected all his Astacidoe in a rivulet 

 near Greenville, in the northwestern part of South Carolina. No other speci- 

 men of C. affinis has been reported from that State, and I suspect that Erich- 

 son's type belongs to the closely allied C. spinosus Bundy, which has been 

 found in the Saluda River, S. C., by Prof. D. S. Jordan. In the museum of 

 the Academy of Natural Sciences is a specimen of this species (No. 127) 



