Happon—The Actiniaria of Torres Straits. 413 
As there is a considerable resemblance in the general appearance of the various 
members of this group, it is possible that the form I have identified from Malahide, 
Co. Dublin, as H. ehrysanthellum (Proc. R. D. 5. (N.S.), v. 1886, p. 1; Trans. 
R. D. 8., 1889, p. 355), may not be that species, though I believe it is. If the 
type species from Cornwall be found to agree with the foregoing, then it would be 
well to adopt Kwietniewski’s sub-family. Should it, however, be shown that it 
has a mesogleeal sphincter, then Carlgren’s sub-family stands, and 2. purpurea, 
Stud., H. clavus, Hertw., H. arenarea, Hadd., and H. abyssorum, Dan., must be 
placed under the genus Halcampomorphe, Carlgren (1893, p. 38), and in the sub- 
family Haleampomorphine. Carlgren suggests H. clavus, Hertw., as the type 
species ; it was certainly the first of this group to be anatomically investigated. 
I would, however, again point out that we have no proof that this form is the 
same species as H. clavus, Quoy et Gaim. 
PEACHIA, Gosse, 1855 (Siphonactinia, Dan. and Kor., 1856). 
A history of this genus was given by G. Y. Dixon and myself (Proc. R. D. S., 
1885, p. 399), and, later (Trans. R. D. 8., 1889, p. 338), L alluded again to it. 1 
have nothing more to add at present, except that it falls under the definition of 
this sub-family, as there is a feeble diffuse endodermal sphincter. 
ILYANTHUS, Forbes. 
This genus requires investigation. Simon* has recently described what he 
identified from spirit specimens as J. partenopeus, Andr. (Andres, 1883, p. 242). 
He finds it has forty-eight tentacles (6 + 6 + 12 + 24), which decrease in size from 
within outwards, and twenty-four pairs of mesenteries (6 + 6+ 12) ; all of which, 
more or less, reach the cesophagus, and are fertile, with the exception of the two 
pairs of directives. There is a very small, circumscribed endodermal sphincter. 
Two gonidial grooves. No acontia. Andres says there may be ninety-six ten- 
tacles and five cycles. 
Carlgren informs me that he thinks Eloactis will also be placed here, the type 
species of which, #. Mazeli (Jourd.), has recently been in English waters (W. 
Garstang: ‘‘On some new or rare marine animals recently discovered on the 
coast of Devonshire.” Trans. Devon. Assoc. xxtv., 1892, p. 380). 
Sub-fam.—Hatianruina, Kwietn., 1896 (=Haleampine, Carlgren, 1893). 
Ilyanthide with few perfect mesenteries; imperfect mesenteries present or 
absent ; mesoglceal sphincter; acontia and cinclides wanting. Twelve or more 
tentacles. 
*J. A. Simon. Ein Beitrag zur Anatomie und Systematik der Hexactinien —Jnaugural- Dissertation. 
Miinchen, 1892. 
