138 J. E. Durerpen—Jamaican Actiniaria : 
several of the forms to follow. From his paper just received, I find that Professor 
Haddon and myself have independently come to the same conclusion with regard 
to the degree of importance to be attached to these histological details. In the 
same contribution Haddon discusses at some length the points at issue between 
Carlgren’s tribe ProrantHEe& and the Proractrinra of M*Murrich. 
Regarding it as a relic from the ancestral Scyphistoma, Haddon (p. 411) 
considers that the ectodermal columnar and stomodeeal musculature may persist 
amongst the lowest, ze. the least specialized, members of various groups. This 
view of its significance is further supported by the fact that it is often associated 
with a practically homogeneous mesogloea, and sometimes with the absence of the 
‘‘ Wlimmerstreifen ” of the mesenterial filaments. Such is the case in Corynactis 
and Ricordea, and partly so in Cerianthus, in each of which an ectodermal muscu- 
lature occurs; but in Phymanthus, and one or two others where the same struc- 
ture is also developed, the mesoglcea is fibrous and includes numerous cells. 
In a recent paper (1898), I have endeavoured to show that the combination of 
external and anatomical features met with in several of the Stichodactyline here 
described, are such as are also characteristic of the Madreporaria. 
Sub-order.—HETERODACTYLINA, N. S.-0. 
Family.—Puymantuip#, Andres. 
Thalassianthine, . . (pars), M. Edwards, 1857. 
Phyllactinie, ; . (pars), Klunzinger, 1877. 
Phymanthide,  . . Andres, 1883; MMurrich, 1889 ; Kwietniewski, 
1898; Haddon, 1898. 
Stichodactyline, in which the tentacles are of two kinds: marginal tentacles 
arranged in several alternating entacmzeous cycles, laterally tuberculiferous, or 
frondose; inner tentacles radially or irregularly arranged, very small, tubercular 
or papilliform. 
Genus.—_PHYMANTHUS, Milne Edwards.* 
Actinia, . : . (pars), Lesueur, 1817. 
Actinodendron, . . (pars), Ehrenberg, 1884. 
Phymanthus, . . Milne Edwards, 1857; Klunzinger, 1877; Andres, 
1883 ; MMurrich, 1889 ; Kwietniewski, 1898 ; 
Haddon, 1898. 
* While this contribution was going through the press I received from Prof. A. E. Verrill a copy of 
his paper: ‘‘ Descriptions of new American Actinians, with critical notes on other species, I.” Amer. 
Journ. Science, vol. vi., 1898, pp. 493-498. In connexion with the genus of the species here referred 
