426 Havpon—The Actiniaria of Torres Straits. 
noted in their variations. Gonads (testes) appeared to be present on only one 
mesentery, and that was on one of the central pair of the group of five. 
Specimen D.—This male specimen has three pairs of directives and ten pairs 
of non-directives. ‘The mesenterial formula is 
D3 - D2 D+) = lo. 
The arrangement of the gonads is so peculiar that it is illustrated by the 
accompanying figure, which will give a better idea than a long verbal descrip- 
tion. The figure is diagrammatised, in order to indicate the main points 
D 
dD 
more clearly. It will be seen that only one pair of directives is fertile; if we 
assume that this and one of the other pairs are the original axial directives, and 
that the fertile pair is the sulcular pair, then the fertile non-directive mesenteries, 
can, toa certain extent, be brought into relation with those in Edwardsia; if we also 
assume that pairs of mesenteries may develop somewhat irregularly in various 
exocels. The arrangement of the mesenteries on each side of the sterile directives 
in specimen A is somewhat analogous. ‘There may not be anything in this com- 
parison ; but, on the other hand, we can only get a true conception of mesenterial 
arrangement by bearing in mind the order of their appearance. 
Actinioides Papuensis, n. sp. 
(Pl, XXIL, fig: 7; El XXVILY fies. 3-7.) 
Form.—Column with verrucee arranged in vertical rows; the acrorhagi are 
prominent, and appear to be alternately slightly larger and smaller. Sphincter 
very feeble diffuse, 
Dimensions.—Of spirit specimen about six-sevenths of an inch in diameter. 
Habitat.—On the shore near a mangrove swamp, Mabuiag. 
Unfortunately there is not among my notes a description of the animal when 
alive, nor any figure of it. The contracted spirit specimens show nothing which 
is at all distinctive in character, and they resembled, on the whole, Actinioides 
Dizoniana. Reliance must therefore be placed on the character of the sphincter 
muscle for specific diagnosis. 
