CLASSIFICATION OF ACTINIARIA 509 
and mesenteries. Dactylanthus has a good actinopharynx 
but has tentaculiform outgrowths of the body, curious actino- 
pharyngeal pouches, and a fusion of the lower ends of the 
mesenteries into a columella-like network. Further, both 
genera are unique in two ways: firstly, the upper extremities 
of the filaments of the imperfect mesenteries are modified into 
curious structures like bisected funnels, the analogy of which 
TEXT-FIG. 3. 
One-half of a specimen of Paradiscosoma. Note the cup- 
shaped form, mcuth on a cone at the bottom of the cup, tentacles 
reduced to knobs lining the cup. Mesogloea, &c., black. The base 
was injured, and is not fully shown. The tentacles have narrow 
“stems ” running through the thick mesogloea of the disc. 
among other forms it would be difficult to suggest ; and, 
secondly, the gonads and filaments are confined to different 
parts of each mesentery, the free border of the latter (or what 
corresponds to it in Dactylanthus) being occupied by 
filament above and gonad below, quite an unusual state of 
affairs. 
From this one would judge that the Ptychodactids are 
a collection of curiosities which have diverged along a little 
NQ, 260 Mm 
