408 Happon—The Actiniaria of Torres Straits. 
Parazoanthus dichroicus, H. & S. 
Parazoanthus dichroicus, add. and Shackl., 1891; Trans. R. D.S. (2) 1v., p. 698 ; 
Pl. cx1., fig. 15; Pl. uxi., fig.5; Kwietniewski, 1897, 
Abhandl. Senckenberg. Naturf. Gesellsch. xxut., 
p. 341. (Ternate. ) 
Form.—Body short, incrusted with sand and spicules; capitulum with 
about eighteen distinct ridges ; ccenosare incrusting a specimen of Plumularia 
Ramsay. 
Colour.—Body and ccenenchyme grey ; capitulum pale yellow. 
Dimensions. —2—2'5 mm. high; 1°25-1°5 mm. in diameter. 
Locality.—Channel between Mer and Dauar, about 20 faths. 
Parazoanthus Douglasi, H. & S. 
Parazoanthus Douglas’, Hadd. and Shackl., 1891; Trans. R. D.S., (2) 1Vv., p. 700 ; 
Pl. ix1., figs. 16-22; Pl. uxir., fig. 6. 
Form.—Body when growing on Hydroids often somewhat long, and relatively 
narrow, but when growing on a flat surface usually short and thick; capitular 
ridges not well marked ; texture gritty ; ccenosare incrusting. 
Colour.—Sand colour. 
Dimensions —Largest specimens, 8—9 mm. in height; 2-25 mm. in diameter ; 
the shorter specimens growing on flat surfaces, 8-5 mm. and 2mm. respectively. 
Locality Albany Pass, 10 faths. 
GERARDIA, Lac.-Duth. 
Macrocnemic Zoantheze with a diffuse endodermal sphincter muscle. The 
body-wall is incrusted. The ectoderm is continuous. The mesogloea contains 
ectodermal canals, an encircling sinus, and cell islets. The ccenosare secretes a 
well-developed, much branched, horny skeleton. 
G. Savalia. 
The Zoanthean affinities of this interesting form, which was usually regarded 
as allied to the Antipatharia, were first demonstrated by Carlgren (‘‘ Ueber die 
Gattung Gerardia, Lac.-Duth.” Ofvers. Kongl. Vet. Akad. Férhandl., Stockholm, 
1895, p. 319). He pointed out that the only distinction between this genus and 
Parazoanthus was in the secretion of a black, branched, horny, ccenenchyme. 
From some slides that were prepared by the late Dr. George Brook, I have been 
able to confirm Carlgren’s statements. The only doubt in my own mind is 
whether the ccenenchyme is really secreted by the polyps, or whether they 
merely utilise the skeleton of a dead Gorgonian. 
