238 Proceedings of the Royal Physical Society. 
transference of the second afferent vessel from the anterior to the posterior 
innominate, or by the independent origin of the same second afferent vessel 
from the ventral aorta. In no case has a transference been observed of one 
of the three posterior afferents to the anterior innominate. 
Fie, 2, Rava circularis, 6. Fic. 3. Raia circularis. 
Fig. 1 represents a condition which exhibits least departure from the 
normal. The right anterior innominate is very short and gives rise to two 
long afferent vessels, thus presenting a slight want of symmetry between the 
two sides. 
In Fig. 2 a case is represented in which the abnormality affects both sides 
and is all but symmetrical. Each anterior innominate passes, without 
branching, into a single afferent branchial vessel, while each posterior 
innominate gives rise to four, that is, to one in excess of the normal number. 
Fie. 4. Rava. Fie. 5. Raia, 
Species and sex not recorded. Species and sex not recorded, 
Figs. 3, 4 and 5 are sketches of three closely similar cases in each 
of which the second afferent vessel has, so to speak, been transferred from 
the anterior to the posterior innominate, but on one side only. 
