336 Miller—The Anatomy of the Heart of Cambarus. 
placed almost central, while in Cambarus they are placed some 
distance anterior to the center. 
(2) The hepatic arteries arise much nearer to each other in 
Cambarus than they do in Astacus. 
(3) In Astacus the heart is attached to the pericardial cham¬ 
ber by ligaments extending from the anterior and posterior 
cornua, while in Cambarus not only are ligaments found attached 
at these points, but there is also present on each side a strong 
lateral ligament extending along the entire ventral border. 
(4) In shape the two differ widely from each other. The 
heart of Cambarus is longer, narrower and less rounded pos¬ 
teriorly than is that of Astacus. 
Madison , Wis. 
Note. —The species of Camberus for this locality have not 
been determined. Probably there are three species found in our 
waters. The foregoing description of the heart holds good for 
all the species. 
