364 Mr. P. W. Bassett-Smitli on 
short stout spines, which are in places disposed in longitudinal 
wavy lines. 
There is only a single specimen of this species ; it is 120 
millim. in height and 140 in width, but the lower portion of 
it was dead when dredged and the branches are hollowed out 
by boring-sponges and incrusted by Nullipores. 
In its mode of growth and in the prominent lip of the calices 
this form belongs to the same group as 8. angulata , KL, S. 
pacifica , Brugg., and 8. spinosa , M.-Edw. It approaches 
nearest to 8. angulata , but the calices are much smaller and 
closer arranged in the rows than in this species, and the 
branches are less acuminate. 
There are in this specimen several instances of those pecu- 
liar abnormalities of growth which Ehrenberg compared to 
galls in plants. They assume the form of flattened hollow 
disks, with thin walls formed of the coral ; the margins of 
the disks are perforated. Imprisoned within each of these 
discoid cages is a small crab which cannot escape. 
From the Tizard Bank, at a depth of \ fath. 
Seriatopora compacta ) sp. n. 
Corallum growing in small clumps consisting of rounded 
or somewhat compressed branches about 6 millim. thick, which 
dichotomize at intervals of from 5 to 7 millim. and frequently 
coalesce, so that the coral has a fenestrate appearance. The 
summit branchlets are short, from 3 to 5 millim., conical, 
about 2 millim. thick at their bases, summits obtuse, 
occasionally winged, crowded with young calices. Calices 
closely arranged on branches ; the serial arrangement is not 
distinct, but there appear to be about nine rows on a branch ; 
the calices are from 2 to 3 millim. apart in the rows and 
about an equal distance laterally ; there are from five to six 
calices in a length of 5 millim. The calices are nearly 
circular, from *6 to *75 millim. in width, their margins 
scarcely at all prominent, but the upper lip is occasionally 
indicated by longer spines. The calices are deep and the 
large septa and the pits at the bottom can be distinguished. 
The narrow interspaces between the calices are covered with 
short spines. 
This species is of the type of 8 . crassa , Quelch, and 8. 
transversa , Quelch, but differs from these forms in having 
less robust and closer arranged branches, whilst the calices 
are larger and closer together. 
Only two imperfect examples of this species have been 
obtained ; the largest is 40 millim. in height by 60 in width. 
Tizard Bank, 5f fath. 
