12 
external to the ray-like projections of the opercular cartilage of 
Husrecut’s (1876/7) descriptions of Chimaera monstrosa. The ceratohyal 
rays, it is to be noted, are simply attached to the ceratohyal and 
do not form a part of that element, as shown in HUBRECHT’s figure. 
In the first, second and third branchial arches there are both 
anterior and posterior efferent arteries, and these arteries retain, in 
the adult, their dorsal commissural connection with each other. In 
the hyoidean arch there is a posterior artery, alone, and in the 
fourth branchial arch an anterior artery, alone, there being but 
a single hemibranch in each of these two arches. The efferent 
acer BERNIC, (ce Ida da 






‘ 
H ; ‘ 
ta elh cor 
Fig. 2. Diagrammatic representation of the arteries in Chimaera colliei. 
hyoidean artery lies internal (posterior) to both the ceratohyal and 
opercular cartilaginous rays. 
The posterior efferent artery in each arch is connected with the 
anterior artery in the next following arch by both dorsal and ventral 
commissures, and the anterior and posterior arteries in each of the 
first three branchial arches are connected by several intermediate 
commissures; all of these several commissures lying internal to the 
related afferent arteries. There is, accordingly, in Chimaera, an 
efferent loop around the ventral end of each of the first four gill 
clefts, and along the dorsal edge of these clefts there is a continuous 
longitudinal commissure, as in Chlamydoselachus (ALLIS, 1911). 
