142 A REVISION OF THE ASTACIDA. 
The best illustrations of this species are Lereboullet’s (under the name 
Astucus lougicoriis ). 
Klunzinger’s memoir clearly brings out the specific characters of this 
species and A. padlipes. 
Although a faint median rostral carina may exist in A, forrentiwm, it never 
rises into a prominent sharp crest near the tip, as in A. pallipes. Commonly 
there is no spine on the lower side of the first antennulary segment, but in a 
specimen in the Museum of Comparative Zodlogy, without locality, I find it 
quite well developed, as it always is in A. padlipes. 
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. pallipes. See page 140. 
Distribution. 
especially in Germany; but as it has been confounded generally by authors 
Astacus torventium is found in the central part of Europe, 
with A. pullipes and A. flurialilis, the data are insufficient to determine the 
limits of its distribution. It is not found to the eastward within the territory 
of Russia (Kessler). I have seen a specimen (in U. 8. National Museum) 
from Bohemia. It is widely spread through Bavaria and Wiirtemberg 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. ci/., p. 247; Wolf, op. ecit., p. 42; A. fluviatilis also inhabits the 
same lake); mountainous parts of Oberpfalz; near Bodenstein; also in the 
Danube (Koch) and Kochel-See (Klunzinger), In Wiirtemberg 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 III 
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. padlipes and 
A. fluviatilis. On the whole, it would seem that A. forrentium is a form chiefly 
found in the mountainous and upland regions of Central Europe. 
7. Astacus pallipes. 
? Astacus astacus, Pennant, British Zodlogy, IV. 18, Pl. XV. fig. 27, 1777. 
? Astacus fluviatilis, Leacn, Trans. Linn. Soc. London, Vol. XI. Pt. IL. p. 344, 1815. (No deseription.) 
Astacus fluviatilis (in part), Minne Epwarps, Hist. Nat. Crust., IT. 830, 1837. (First “variety ” noted on 
p. 331.) — Cuvier’s Regne Animal, Disciples’ ed., Crustacés, Pl. XLIX. fig. 2. 
Duhlenkrebs, LUREBOULLET, Comptes Rendus Acad. Sci. Paris, XX XIII. 376, 1851. (Treated as a variety 
of A. fluviatilis.) 
Astacus fluviatilis, Bett, Hist. British Stalk-eyed Crustacea, p. 237, with cut, 1853. 
