9 
XENUS СүтлоїА, Milne Edwards and Haime. 
Cylicia rubeola, Quoy and Gaim., sp. 
Dendrophyllia rubeola, Quoy and Gaim., Voy. de I Astrolabe. 
Zooph., р.,97, РІ. xv., fig. 12-15. 
Angia rubeola, Edwards and Haime, Ann. Sei. Nat., 3rd ser., v. x, 
Plavir, 56,00. xij p 176, 
Cylicia rubeola, Tenison Woods, Linn. Soc. N.S.W., Vol. 11., pp. 324-5. 
This coral is largely represented in Dr. Verco's dredgings and 
it is abundant also in Port Philiip Bay. Asa fossil species it 
has been recorded by Professor Tate from the Older Pliocene 
of South Australia.* 
GzNvus PLESIASTRÆA, Milne Edwards and Haime. 
Plesiastræa proximans, spec. nov. Pl. ii., figs. 3a, b. 
The corallum is convex and longer than broad ; both its upper 
surface and sides are covered by crateriform calices, which are so 
closely packed that the wall between is barely visible. It 
increases by intercalicinal gemmation. The base is broad and 
incrusting. Оп its edges the exotheca, or common plateau of the 
corallum, is marked by strong wavy lines which are continuations 
of the coste of the marginal corallites. "The calices are either 
circular or slightly elliptical, and, though widely open, are not 
shallow. There is à well marked trabecular columella at the 
bottom of the fossa. 
The septa are in four cycles and six systems, but these are 
rarely complete. In the calice figured there are 35 septa. All 
are strongly dentate on their edges and finely granular laterally. 
The principal orders are stout and sub-equal; while those of the 
fourth order are short and slender. Some of the lamellz in one 
calice may pass over the wall and continue into the next; 
usually, however, the junction of adjoining calices has a confused 
appearance owing to the outer ends of their septa meeting at an 
angle. The pali are long, prominent, lobed, and dentate, and 
placed before all orders except the last. Their upper projecting 
edges are free, a wide and deep sulcus separating them from the 
septal ends ; but lower down the two structures are connected by 
thin processes. The endotheca is scanty and mostly confined to 
the neighborhood of the columella. 
The corallum is 13 mm. high, 19 mm. long, and 10 mm. broad. 
One of the circular calices measured is 5 mm. in diameter. The 
single example obtained was dredged in St. Vincent Gulf, at a 
depth of 22 fathoms. 
This species differs in shape, as well as in other respects, from 
the common Plesiastraa found in Port Phillip Bay. The latter 
is probably identical with P. Urvillei, Edwards and Haime. 
FRISA. Vol хир. 178. 
