Fic. 
Gane 
Fie. 
Fie. 
Fie. 
nie? 
5 Se 
6. 
8. 
(J) 
MEMOIRS OF THE CARNEGIE MUSEUM 
Burrow of Cambarus diogenes Girard. Located in stiff blue clay, in a ditch on a road- 
side, Nine-Mile Run, Pittsburgh, Allegheny County. Opened by the writer, Nov. 
5, 1904. The season had been very dry, and not much water was in the hole. 
Pebbles were lying on the bottom of the hole. a, old chimney, leveled down by rain, 
probably built in spring; 6, fresh mud, brought up recently (beginning of fall 
activity) ; wl, water level ; x, place where the specimen (female, 77 mm. long) was 
taken. 
Burrow of Cambarus diogenes Girard. Located in yellow clay and humus, at a springy 
and swampy place in woods on the side of a wagon road, upon which water was 
standing (after a heavy thunder-shower on the previous day), at Squaw Run, Alle- 
gheny County. Dug out by the writer, May 27, 1904. a, chimney, consisting of 
’ in the mouth of the chimney, distinctly differing from the 
yellow clay ; 6, “stopper ’ 
chimney, the material being yellow clay mixed with blackish mud and leaf-mould ; 
wl, water level ; 7, road, with mud-puddle upon it ; w, place where the crawfish (male, 
first form, 76 mm. long) was found. 
Burrow of Cambarus diogenes Girard. Located in yellow and blue clay, on the border 
of a swampy place, Schenley Farm, Pittsburgh, Allegheny County. After a sketch 
furnished by Mr. F. E. Kelly, Nov. 14, 1904. sw, swamp; be, blue clay ; ye, yel- 
low clay ; a, one-sided chimney, consisting of yellow clay (probably made in spring 
and summer) ; 6, new chimney, consisting of blue clay (fall activity, reclaiming of 
old burrow at ¢) ; ¢, old burrow, filled in (during summer) with blue clay, taken or 
washed in from near the mouth of the lower entrance (a) of burrow ; w/, water level ; 
x, place where the crawfish was taken. 
Burrow of Cambarus diogenes Girard. Located in blue and yellow clay on the bank 
of a small stream, Schenley Farm, Pittsburg, Allegheny County. After a sketch 
drawn by Mr. F. E. Kelly, Nov. 15, 1904. s, stream ; bc, blue clay ; yc, yellow 
clay ; a, new chimney, consisting of yellow clay, evidently coming from the newly dug 
shaft going down vertically ; 6, upper end of ascending branch of hole, without open- 
ing (possibly originally open, but sealed up, and the pile of mud overgrown and 
obliterated by vegetation) ; wl, water level ; x, place where the crawfish was taken. 
The chimney at @ shows fall activity, and the vertical shaft is being built by the 
crawfish in order to get deeper down into the ground. 
PuatE XLII. 
Preglacial Monongahela River, after Leverett (1902, p. 89, fig. 1). 
Present range of Cambarus obscurus Hagen and C. propinguus Girard. (Including 
variety sanborni (Faxon)). 
Distribution of Cambarus propinquus Girard, propinquus sanborni (Faxon), and C. 
obscurus Hagen. 
(For further explanation, see legend on map, and text, p. 433-446). 
