Havpon—The Actiniaria of Torres Straits. 407 
Palythoa coesia, Dana. ( ?) 
Palythoa ccesia, Dana.(?) Hadd. and Shackl., 1891; Trans. R. D. S. (2) 1v.; 
Pl. uxr. fig. 14; fig. 2, p. 696; Saville-Kent, 
“The Great Barrier Reef of Australia,” 1893, 
p. 152, chromo pl. iii., fig. 1. 
Form.—Polyps slightly projecting above the surface of the ccenosare when 
contracted; ccenosare incrusting, of moderate thickness; polyps large, not 
crowded, of rounded contour; about twenty capitular ridges. 
Colour.—Greyish white in spirit specimens. (Varying shades of rich creamy 
yellow, the minute tentacles being a ‘‘ more distinct brown,” S.-K.) 
Dimensions.—Diameter of polyps about 9 mm. 
Locality Reefs, Torres Straits. 
SPHENOPUS, Steenstrup, 1856. 
Free, solitary, brachyenemic Zoanthez, with a single, very long, mesoglceal 
sphincter muscle. The body-wall is incrusted. Cell-islets present in the meso- 
gvloea. 
Sphenopus arenaceus, Hertw. 
Sphenopus arenaceus, Hertw., 1882. Voy. H. M.S. “Challenger,” Zoology ; Rep. on 
Actiniaria, p. 120; PL w., fig. 10; Pl. xiv., fig. 8; and 
Supplement, p. 52; Hadd. and Shackl. 1891. Trans. 
Rh. D:S:, p.697. 
Form.—Pyriform, non-pedunculate ; tentacles small, pointed, about sixty in 
number, in two cycles; thirty perfect and thirty imperfect mesenteries, 
Colour.—Brown-red (in spirit). 
Dimensions.—Length, 45 mm. ; breadth, 28 mm. 
Locality.— Prince of Wales Channel, 6 faths. (‘ Challenger,” Station 187.) 
No characters are given, except the colour, by which this species can be dis- 
tinguished from 8. marsupialis, Steenstr. 
Sub-family I1.—Macrocneminm, Hadd. and Shackl., 1891. 
Zoanthez in which the sulcar element of the primitive sulco-lateral pair of 
mesenteries (cnemes) is perfect. 
PARAZOANTHUS, Hadd. and Shackl., 1891, p. 653. 
Macrocnemic Zoanthez with a diffuse endodermal sphincter muscle. The 
body-wall is inerusted. The ectoderm is continuous. The mesogloea contains 
ectodermal canals, an encircling sinus, lacunz, and cell-islets. Dicecious, Polyps 
connected by their ccenosare. 
