Parker and Davis. — Heart blood vessels in fishes. 
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PLATE 1. 
Eig. 1. Ventral view of the blood vessels in the region of the heart and bran¬ 
chial clefts of Carcharias littoralis. The insertions of the coraco- 
hyoid and coracobranchial muscles are indicated on the left side only. 
3 and 5 third and fifth insertions of the coracobranchial muscle. 
Fig. 2. Ventral view of the blood vessels in the region of the heart and bran¬ 
chial clefts of Raja erinacea. 
