82 
Proceedings of the Royal Society 
Culeolus , n. gen. 
Body more or less ovate, stalked. 
Branchial aperture three-lobed. 
Atrial aperture bi-lobed. 
Branchial sac longitudinally folded, consisting of longitudinal 
and transverse bars. No stigmata, the fine longitudinal vessels 
being absent. 
Tentacles compound. 
This genus is formed for the reception of a remarkable little 
group of six deep-sea species of stalked Simple Ascidians, which 
were at the first glance referred to Boltenia. They must still be 
considered as near allies of that genus but they differ from it in 
several important details of structure. 
In addition to the characters in the above description, mention 
must be made of a system of branched calcareous spicules found 
Branchial sac in Culeolus. 
tr., Large transverse vesssel small transverse vessel; il., internal 
longitudinal bar ; mh., mesh ; sp., spicula. 
in the vessels of the branchial sac, &c., and more or less developed 
in all the species (see woodcut). 
