The present specimen is a big fragment from a presumably wide explanate colony whose upper peripheral portion is broken into lobes, each of which tends to roll around to form tubes or chimneys with the non-calicinal surface inside. Calicinal surface very rough because of the corallites and bristly because of prominent projections (spines) on calicinal walls, costae and septocostae. Non-calicinal surface marked with ridges arranged like the spokes of a fan, longest ones slightly elevated with papilliform spines on their edges, some of these spines fimbriated so they look like bunches. The finer ridges also carry finer, but simple spinules.
Corallites typically nariform, large (up to 10 mm across), elevated (6-8 mm) above surface. Calice facing edge of corallum, oval, 8 x 6 mm at most; greatest diameter across courses of septocostae. Distal wall wanting, septa on this side continuous with septocostae. Proximal wall made very prominent by very exsert septa. Corallites unequally distant, in some places arranged in short series.
Principal septa usually 12-14 in each corallite, thick, wide, their edges armed with blunt spines which are not very high inside calicinal fossa but very high and abundantly sub-divided on exsert portion continuous with costae. Subordinate septa low, almost smooth, usually alternating with principal ones. Principal septa continuous on proximal wall into prominent costae armed with prominent clusters of spines; subordinate septa may or may not be continued on the outer wall by very low, smooth costae alternating with large ones. Septocostae run from one corallite below to another next above it, those continuous with septa of the former on distal side end as costae on the proximal wall of the latter, hence no septocostae run all the way from bottom to edge of corallum. Principal septocostae produce clusters of spines at intervals while intervening lower ones smooth or with very fine simple spines.
Columella well marked, consisting of projections from septa.
