142 A EEVISION OF THE ASTACUXE. 



The best illustrations of this species are Lereboullet's (under the name 

 Astuctis loiifficornis*). 



Klunzinger's memoir clearly brings out the specific characters of this 

 species and A. paliipes. 



Although a faint median rostral carina may exist in A. torrentium, it never 

 rises into a prominent sharp crest near the tip, as in A. paliipes. Commonly 

 there is no spine on the lower side of the first antennulary segment, but in a 

 specimen in the Museum of Comparative Zoology, without locality, I find it 

 quite well developed, as it always is in A. paliipes. 



I have examined the gills of this species in a specimen from Bohemia in 

 the U. S. National Museum, and find them to agree in number and disposi- 

 tion with those of A. paliipes. See page 140. 



J}iafri/Jiif/nii. Astucus torrcnlhun is found in the central part of Europe, 

 especially in Germany ; but as it has been confounded generally by authors 

 with A. paliipes and A. fluvialills, the data are insufficient to determine the 

 limits of its distribution. It is not found to the eastward withm the territory 

 of Russia (Kessler). I have seen a specimen (in U. S. National Museum) 

 from Bohemia. It is widely spread through Bavaria and Wurtemberg in the 

 mountain lakes, and in the brooks and rivers of the Danube and Neckar 

 river systems. Particular localities recorded in Bavaria are Wiirm-See 

 (Schrank, op. cit., p. 247 ; Wolf, op. cif., p. 42 ; A. flnriatiUs also inhabits the 

 same Like) ; mountainous parts of Oberpfalz ; near Bodensteiu ; also in the 

 Danube (Koch) and Kochel-See (Klunzinger). In Wurtemberg it has been 

 found in the Neckar, the Nagold, and various small streams of the Neckar 

 and Danube basins (Klunzinger). It is also found in Alsace in the rivers 111 

 and Bruche, near Strasburg (Lereboullet). How far to the northward it ex- 

 tends in Germany, and whether it passes to the west into France, I cannot 

 determine. All the French specimens which I have seen are A. paliipes and 

 A.fliiviatili*. On the whole, it would seem that A. torrent t'um is a form chiefly 

 found in the mountainous and upland regions of Central Europe. 



7. Astacus paliipes. 



2 AS/HCIIS (isfacim, PENNANT, British Zoology, IV. IS, PI. XV. %. 27, 1777- 



? Asta<'/is jlnriii/ilis, LEACH, Trans. Linn. Soc. London, Vol. XI. Pt. II. p. :>ll, 1M5. (No description.) 



Axhi,-H-<jl/ii-iii/ili.i (in part), MILNE EDWARDS, Hist. Nat. Crust., II. 330, 1837. (First "variety" noted on 



p. 331.) Cuvier's Hi'giic Animal, Disciples' ed., Cnistaccs, PI. XLIX. fig. 2. 

 Duhlenkrelis, LKKEBODLLET, Comptes Rcudus Acad. Sci. Paris, XXXIII. 376, 1S51. (Treated as a variety 



of A.ftiviafilis.) 

 Astacus jluviatilis, BELL, Hist. British Stalk-eyed Crustacea, p. 237, with cut, 1853. 



