100 THE VOYAGE OF H.M.S. CHALLENGER. 
where these are in the same line, the parent calicle becomes very long. The simple cells 
are from 5 to 10 mm. in diameter, and from 2 to 5 mm. deep. The walls are often 
2 mm. thick and rounded, but generally they are thinner and somewhat acute. The 
septa are somewhat truncated above, exsert, narrow, thin, and irregularly denticulate, and 
give a ragged aspect to thecorallum ; they are of three or four cycles, the last two being 
small and incomplete. The pali are very uneven and irregular, thin, elongated and generally 
much divided and denticulate. The columella of a few small shorter points often scarcely 
distinct from the pali. Endotheca abundant, dissepiments very small, thin and irregular. 
This species recalls many of the characters of Goniastrea planulata and Goniastrea 
coronalis, andrepresents an’extreme form of the genus. 
Two large specimens were obtained. 
Locality.—Amboina. 
2. Goniastrea exinua (Dana). 
Astrea eximia, Dana, Zoophytes, p. 242, pl. xiii. fig. 4. 
A small but excellent specimen of this well-marked species was obtained. The walls 
are extremely compact, and the corallum in consequence very heavy. Those cells which 
are in process of division are often quite large, bemg about 6 mm. in diameter. 
Locality.—Banda. 
3. Goniostrea cerium (Dana). 
Astrea cerium, Dana, Zoophytes, p. 245, pl. xin. fig. 8. 
This species has much of the appearance of Goniastrea exinia, but its calicles are 
much smaller and quite shallow. The diameter of the calicles is from about 3 to 4 mm., 
and the depth about 1 mm. The walls are solid and thick, marked with shghtly exsert 
septa. The pali are small but distinct, and are placed on the larger septa. The third 
cycle is incomplete and small, and rudiments of a fourth cycle are present in the larger 
cups. 
Locality.—Kandavu, Fiji. 
4. Goniastrea favistella (Dana). 
Astrea favistella, Dana, Zoophytes, p. 241, pl. xin. fig. 2. 
Only a fragment of the basal part of a specimen of this species occurs in the collection. 
The septa are of four cycles, the last being incomplete and very small; occasionally 
rudiments of a fifth cycle are to be found. 
Locality. —Banda. 
