296. On new ‘Challenger’ Reef- Corals. 
Tichoseris obtusata, n. sp. 
Corallum consisting of blunt, elongated, lobate masses of 
very dense structure throughout. Calicles small, often sepa- 
rate, subcircular or elongated and polygonal, about 8-5 millim, 
in diameter, rather deep, but almost filled up by the closely 
packed septa ; more generally two to six or more calicles are 
grouped together, with their walls incompletely developed, so 
that they give the appearance of many centres surrounded by 
one raised wall, which is of very irregular shape and size, 
being long, sinuous, and narrow, or rounded and wide, often 
5-14 millim. in diameter. Wall very solid, thin-edged above, 
but thick below. Septa not exsert, very numerous, in the 
separate calicles there are as many as five cycles, but the fifth 
is very incomplete ; those of the first two cycles are subequal, 
those of the fourth and fifth very small; but all are entire, 
very thin above, extremely granulated or finely echinulate on 
their sides, with their inner edges nearly vertical. Columella 
very rudimentary. 
Locality. Reets, Fiji Islands. 
NAPOPORA, nov. gen. 
Corallum compound, porous. Gemmation intracalicinal, the 
developing buds with distinct centres almost destitute of dis- 
tinct walls, at first united in groups of two to six, and sur- 
rounded by the common wall of the parent calicle; but as 
development proceeds they are separated off by a narrow, 
raised, distinct wall. Calicinal depressions very variable in 
size and shape, according to the number, position, and degree 
of development of the buds. Walls of the older calicles porous, 
distinctly raised, angular. Septa generally of two cycles, 
rudimentary. Pali six, sometimes one smaller than the others 
or absent, generally well developed, and distinctly marking 
the position of the calicinal centres. Columella rudimentary, 
represented by small papilliform projections, often absent. 
Napopora trregularis, 1. sp. 
Corallum ramose ; branches rather short, moderately thick, 
obtuse, and slightly or not at all compressed. Calicles very 
variable, seen in all stages of development, with many 
granular points or flattened projections; the single calicles 
with distinct walls, subcircular, about 2 millim. in diameter ; 
the larger ones with many distinct centres in the same cavity, 
with a common wall, raised, angular, and of irregular shape, 
with a diameter of about 4-9 millim. Many of the develop- 
