Corals from the China Sea. 
365 
Seriatopora tenuis , sp. n. 
Corallum forming small bushy masses of closely arranged 
branches, which in the lower portions are subpalmate, but 
above cylindrical ; they are from 4 to 5 millim. in thickness, 
bifurcating at intervals of from 5 to 7 millim. ; the apical 
branchlets depressed, conical, winged, so as to show the rows 
of calices very distinctly; they are 4 to 5 millim. in length 
by 2‘5 millim. thick at their bases. Calices nearly circular, 
*6 millim. in diameter, without projecting lip, from *2 to # 4 
millim. apart in row r s, or five calices in 5 millim. There are 
seven or eight rows on the branches, the rows about ’4 millim. 
apart. Calices deep, showing a sharp thin edge of the axial 
septa, with occasionally a columellar tubercle slightly rising 
from the centre, the calicinal pits well shown. Intermediate 
space finely spinous. 
This species approaches closely to S. compacta , but the 
branches are more slender ; the calices are smaller, and they 
are in fewer rows. There is a single fairly complete speci- 
men 40 millim. in height by 75 millim. in width. 
Tizard Bank, 6 fath. 
Seriatopora armata , sp. n. 
Corallum growing in low depressed clumps of delicate 
thickly- set branches, from 3 to 4 millim. in thickness, some- 
what compressed in their lower portions, bifurcating at 
intervals of about 5 millim., and frequently coalescing. Near 
the summit the branches furcate more frequently and give off 
numerous short spike-like branchlets, conical, acute, winged, 
and from 3 to 5 millim. long by T5 millim. thick at their 
bases. * Calices in five rows on the branches, oval, about *75 
millim. long by # 6 wide, about 3 millim. apart in the rows ; 
margins well marked by stout spines but not exsert. There 
are five calices in 5 millim. and the rows are about *6 millim. 
apart. Calices showing the axial septa distinctly, in the 
centre a slight crestiform elevation (columella?). Areas 
between the calices with short spines which have sometimes 
a linear arrangement. 
There is only a single perfect example of this species, 
which is 35 millim. in height and about 90 wide across the 
summit. In its mode of growth and in the character of the 
calices this form approaches S. compacta and S. tenuis ; but 
its branches are more delicate, the rows of calices are fewer, 
and the surface more spinous ; the numerous short apical 
branchlets is also a distinguishing feature. 
