670 
THE VOYAGE OF H.M.S. CHALLENGED. 
The Polyzoa . — “ About three hundred to three hundred and twenty species of 
Marine Polyzoa were collected during the Challenger Expedition, of which by far the 
largest proportion, or not less than two hundred and eighty, belong to the suborder 
Fig. 223 . — Farciminaria hexagona, Busk, a, natural size ; 
b, magnified ; c, orifice, more highly magnified. 
Cheilostomata, of which about one hundred and seventy appear to have been previously 
undescribecl. 
“ Belonging to the suborder Cyclostomata the number of species is about thirty, 
including perhaps ten new forms ; whilst the Ctenostomata afford not more than seven 
of which two are probably as yet undescribed. 
