260 W. HAROLD LEIGH-SHARPE 
RAIA 
TYPE: RAIA CIRCULARIS 
The painted, ocellated or cuckoo-ray 
In the skates the most striking divergences from the condi- 
tions that obtain in Scyllium are observed (fig. 9). The claspers 
and the ventral surface of the pelvic fins are almost devoid of 
cm. 
Fig.9 Raia circularis. A., apopyle; H., hypopyle; S.S., siphon (sac); 
Cl.Gl., clasper gland; S.7., siphon tube; S.Ap., aperture of siphon tube; B., 
basipterygium. 
dermal denticles. The apopyle exists rather in name for the 
purposes of comparison than in fact and is removed a consider- 
able distance posterior to the cloaca. In the somewhat small 
specimen of Raia circularis taken at Plymouth in April, 1918, 
upon which these observations were made, this distance was as 
much as 1 inch. 
