CLASSIFICATION OF ACTINIARIA yo 
The presence of ectodermal muscele-fibres in the body-wall 
of Corallimorphus, &c., is doubtless a survival. Whether 
the weak general musculature is primitive in this case it 
would not be safe to say; there is much to suggest that it 
is a well-established thing here. Some of the other characters 
TEXT-FIG. 6. 
Sting-cells. All are drawn to same scale, as seen with 4 objective 
and no. 3 ocular. a (Actinotryx) and B (Paradiscosoma) 
show the size characteristic of many ‘soft coral’ sting-cells. 
cis an unusually large Actinian cell from acontium of Artemi- 
dactis, and D (acrorhagi of Bunodactis alfordi) and 
E (Hale ampa aspera, body-wall) show a more average 
Actinian size. 
suggest advancement—the tentacles and their specialization 
of form and arrangement, the big sting-cells, numerous perfect 
mesenteries, and the sometimes thick and rigid bodies. The 
condition of mesenterial filaments they share with all corals. 
Taking them all in all suggestion of primitiveness here would 
