Explanation of Plates . 
387 
EXPLANATION OP PLATE V. 
Fig. 1. Dorsal view of the heart of Cambarus as shown by 
reconstruction. The prominent ridge in the center, the open¬ 
ings of the two dorsal valvular apertures, the common origin 
of the antennary and ophthalmic arteries and the round shoulder¬ 
like projections at the anterior and posterior angles are well 
shown. 
Fig. 2. Same heart viewed laterally. The two lateral 
valvular apertures, the right dorsal aperture and the funnel- 
shaped origin of the superior abdominal artery are to be espe¬ 
cially noted. 
Fig. 3. Ventral view. Note the absence of valvular 
apertures; the common origin of the antennary and ophthalmic 
arteries; the hepatic arteries and the superior abdominal artery. 
The concave surface and the border along which the band-like 
ligament is attached are also shown. 
Fig. 4. View of anterior end of heart, showing the relative 
position of the five arteries which arise from this portion of 
the heart. 
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