50 MCMURRICH. [Vot. III: 
that it is not of such importance. It is produced by the non- 
completion of the process of division, and the forms might be 
compared to such corals as Fungia or Mantcina, which, though 
individual polyps, still possess several mouths. The remarkable 
thing about it is its general occurrence, since Duchassaing and 
Michelotti seemed to have found it almost universal, while it 
was present in several of my specimens. 
Although the facts made out concerning the histology of R/o- 
dactis and Heteranthus are so meagre, yet sufficient has been 
ascertained to confirm the conclusion as to the similarity of these 
two forms, which was arrived at from the study of their external 
characters. Thus they have in common the absence of a circular 
muscle, the weak musculature of mesenteries, disc, and ten- 
tacles, the elevation of the cesophagus wall into a number of 
very pronounced folds, the excessive proportion of glandular 
cells in the endoderm, and the very slight development of nema- 
tocysts. Taking these points in conjunction with the similarity 
in the form of the tentacles, the propriety of associating these 
two genera in the same family is, I think, established. 
Family Phymanthidz, Andres. 
Synon. — Phyllactinize (pars) — Klunzinger, 1877. 
Phymanthide — Andres, 1883. 
Stichodactylinz provided with two kinds of tentacles, mar- 
ginal ones large, tuberculiferous or pinnate, and discal ones small 
and papilliform. 
It seems a question whether this family should not be fused 
with that of the Phyllactide. Tuberculiferous and foliose 
tentacles are merely different degrees of the same kind of 
specialization, and the papilliform discal tentacles are simply 
very much shortened conical ones. It seems well, however, to 
leave them separate just now. 
Genus PHymMantTuus, M.-Edw. 
Synon. — Actinia (pars) — Lesueur, 1817. 
Actinodendron (pars) — Ehrenberg, 1834. 
Phymanthus — Milne-Edwards, 1857. 
Phymanthide with the column provided with longitudinal 
rows of verrucz in its upper part. No sphincter muscle. 
