REPORT -‘ON THE REEF-CORALS. 63 
The septa are generally quite indistinct, but are seen within as lines of fine spinules. The 
columella is well developed, compressed and pointed, minutely spinulous. The surface 
throughout is very abundantly spinulous, the little spines beg often arranged in angular 
areas around the calicles; at the extreme apical parts of the branchlets the surface 
is generally more or less pitted and cellular. 
This species has, like the Seviatopora spinosa, spine-like branchlets, but the two 
species differ altogether in the form and relation of the branches and branchlets, and in 
the form and characters of the calicles. In this species the short, sharp, and thick 
branchlets may be described as being more or less terminal, while in Seriatopora 
spinosa they are very numerously placed along the long axis of the branches and 
are small and thin. A single small specimen was obtained. Many of its branches 
are fistular, being bored throughout by one or more canals. 
Locality.—Ternate. 
12. Seriatopora conferta, n. sp. (PI. II. figs. 1-1). 
Corallum forming a rather light, much ramified, intimately coalescent, densely 
crowded and rather broad clump, in which the branches are divaricately divided at very 
short intervals. Branches about 5 mm. thick at their widest part, rounded and lessening 
slightly towards the apical parts; branchlets quite short, about, 3 mm. thick at their 
base, obtusely rounded and not winged at the apex. Calicles generally circular, often 
oval towards the base, small, about 0°5 mm. wide, extremely deep especially towards the 
upper part of the corallum, distinctly seriate and crowded except towards the base; the 
upper wall usually prominent and rounded, arched forwards so as to make the fossa very 
deep and curved within, finely ribbed on its upper surface, and closely fringed at the 
margin with fine long spinules. Septa usually distinct and. well developed, especially 
conspicuous in the shallower cups at the base, where they often form six slightly exsert, 
rather broad and thick lamelle with rudimentary secondaries irregularly developed ; 
towards the apical parts, the septa are much less distinct, the six primaries becoming 
quite small and often rudimentary, visible only as small markings deep down in the 
fossa, while the edge of the calicle becomes very distinctly margined by very fine and 
sharp elongated spinules. Columella well developed, compressed and pointed, but not 
conspicuous except in the basal calicles, being situated far down in the deep fossa in 
the other calicles. Lateral pits large and very deep, situated close to the proximal end 
of the fossa in the deep calicles; towards the basal parts they become more median. 
Surface delicately spinulose, the spinules being long and very fine. 
The general habit and mode of branching, the nature of the branches and branchlets, 
and the essential structure of the calicles will easily serve to distinguish this species. 
Two rather large specimens were collected, in one of which the septa are much more 
