230 ON THE GENERAL MORPHOLOGY OF THE MYXINOID FISHES. 
Fig. 3. Transverse section of an uninjected afferent branchial artery with a vascular papille having only — 
one opening (very unusual). x50. he tubule leading to the surface and the opening itself are Selle 
larger than is customary. For description see fig. 2. 
Fig. 4. Transverse section of the common carotid artery in the region of the gills showing two vascular 
papilla. x50, The figure is slightly diagrammatic in so far as though both vascular papilla appear in the — 
same sections, the openings of the lower papilla, as figured, were in the next section but one to that drawn. 
The upper papilla had two openings, and two tubules which ended blindly. The lower papilla had two 
openings. The specimen had been injected with soluble Prussian blue. Cp. the description of fig. 2. oF 
Fig. 5. Portion of an afferent branchial artery with one vascular papilla mounted entire and examined 
as a transparent object. x 100. Injected with carmine gelatine. Only a very small portion of the wall of 
the artery is shown. Cp, the description of fig. 2. 
REFERENCE LErrErs. 
af. br. Afferent branchial artery. d. oes. ct, Ductus cesophago-cutaneus, 
a.g.d. Afferent gill duct. ef. br. Efferent branchial artery. 
a. s. ao, Anterior or pre-branchial portion of the e. y. d. Efferent gill duct. 
dorsal or systemic aorta. oes. (Ksophagus—branchial portion. 
au. Auricle of the heart. s. ao. Dorsal or systemic aorta. 
br. cl. Branchial cloaca. s. v. Sinus venosus. 
c. ao. Ventral or cardiac aorta. vent, Ventricle of the heart. 
c. car, Common carotid artery. 
