~ 
Species of ‘Challenger’ Reef- Corals. 293 
present, seen exteriorly to be formed by the trabeculate and 
vermiform nature of the innermost upper part of the septa, 
entirely or almost absent in transverse section, where the 
septa are seen to meet almost at a point. 
Moseleya latistellata, n. sp. 
Calicles very large, the median calicle attaining a width of 
6 centim., and attached by a very broad base to the surface 
on which it grew. Epitheca and wall very thin, the wall 
often rudimentary between the confluent septa of adjacent 
ealicles. Coste very distinct and finely denticulate above, 
continuing as well-marked lines to the very base. Septal 
system containing orders of seven cycles, but the last two 
cycles are incompletely developed, there being about two 
hundred septa in the largest calicle ; the septa are very thin, 
finely cut into subequal sharp teeth nearly 1 millim. in 
length, laterally granulated and thickened chiefly in the direc- © 
tion of the teeth, free above only for a short portion, owing to 
the great development of endotheca, but at the centre the 
endotheca is much less developed, and consequently the 
calicles become much deeper and the septa more prominent. 
The septa of the first two or three orders are about equal and 
run quite to the centre; those of the higher orders become 
smaller and shorter, while rudiments of the highest orders 
are present only at the extreme edge of the calicles ; with the 
exception of these last, the septa are regularly placed and 
equally raised, giving a very even appearance to the calicles, 
especially to the older ones. Pali and true columella absent, 
but the finely trabeculate edges of the septa give the appear- 
ance of a small columella. 
Locality. Wednesday Island, Torres Straits, 8 fathoms. 
PHYSOGYRA, nov. gen. 
Corallum compound, form massive, of very light structure, 
having the calicles in long, sinuous, more or less meandroid 
series, with their walls fused throughout so as to form a 
simple very thin line of separation between the series. Cali- 
cinal centres generally distinct, indicated by the curving of 
the septa. Coste almost entirely absent. Hpitheca very 
slightly developed. Septa thin, fragile, very prominent, dis- 
tant, edge entire. Columella absent. Lndotheca well deve- 
loped, vesicular; the dissepiments continuous between the 
septa from the centre of the calicle to the wall, very convex 
above, rather far apart above each other, thus forming wide 
interseptal chambers. Owing to this great development of 
