REPORT ON THE REEF-CORALS. 143 
and more delicate corallum, in its thinner, smaller, and shorter septa, and in the much 
less distinct costes, which are finely denticulate, very confluent, and irregularly separated 
by short fissures. 
Locality.—Reefs, Fiji; brought alongside the ship by natives off Kandavu. 
Genus 6. Herpetolitha, Eschscholtz. 
Herpolitha, Eschscholtz, Isis, p. 746, 1825. 
Herpetolitha, Milne-Edwards and Haime, Cor., iii. p., 23. 
Herpolitha, Duncan, Rey. Madrep., p. 145. 
The structure of the corallum in this genus has been investigated in detail by 
Professor Duncan. 
Herpetolitha crassa, Dana. 
Herpetolithus crassus, Dana, Zoophytes, p. 310, pl. xx. fig, 5. 
A single very large specimen of this species was obtained. Though close to the 
Herpetolitha limax, it seems to be fairly distinct. The description and figure given by 
Dana are very good. 
Locality.— Banda. 
Genus 7. Sandalolitha, Quelch. 
Sandalolitha, Quelch, Ann. and Mag. Nat. Hist., vol. xiii., 1884, p. 294. 
Corallum compound, flattened, free, much elongated and very thin. Wall sparsely per- 
forated and extremely reduced ; cost distinct, fine, subequal, closely granulated or very 
finely and bluntly echinulate, curving towards the short axis. Calicles few, in the long 
diameter of the corallum ; parent calicle very large, occupying the centre, forming almost 
the entire corallum, with very numerous septa, there being about seven complete cycles, a 
much. larger number of cycles being developed in the long axis of the corallum ; smaller 
ealicles very few, distinctly radiate, developing in the course of and interrupting the 
larger septa in the long axis of the parent calicle. The septa are crowded and very long, 
curving towards the short axis, and of more or less equal vertical extent, very low, 
giving an even laminate appearance to the corallum. Synapticulze well developed and 
forming strong connections at the basal parts of the septa. Columella rudimentary and 
trabecular. 
This genus is related to Zoopilus, Halomitra and Podabacia. With Podabacia 
it closely agrees in the nature of the coste, though the rays are more continuous owing 
1 Journ. Linn. Soc. Lond. (Zool.), vol. xvii. p. 152. 
