REPORT ON THE REEF-CORALS. 91 
to the centimetre according to the development of a fourth cycle. Pourtalés, who had 
ample opportunity of examining numerous specimens in every stage of development, 
was of opinion that there was but one species of the genus to be found in the West Indian 
fauna.’ Excellent figures are given in the Report on the Florida Reefs, plates v., vi. 
Localities.—(1) St. Thomas, West Indies. A single specimen from shallow water 
on the reefs. 
(2) Simon’s Bay, Cape of Good Hope. A single specimen from 10 to 20 
fathoms. 
Genus 15. Meandrina, Lamarck. 
Meandrina, Lamarck, Hist. Anim. sans Vert., ii. p. 244, 1816. 
Meandrina, Milne-Edwards and Haime, Cor., ii. p. 388. 
Pe Duncan, Rev. Madrep., p. 88. 
Three species of this genus were obtained. 
1. Mzandrina labyrinthica (Ellis and Solander). 
Madrepora labyrinthica, Ellis and Solander, Zoophytes, p. 160, pl. xlvi. figs. 3, 4. 
Mezandrina labyrinthica, Dana, Zoophytes, p. 256, pl. xiv. fig. 1. 
A single almost hemispherical specimen, about 14 cm. in diameter, was obtained. The 
ridges are rounded, sometimes slightly truncate, with a slight furrow. The walls are very 
thick and hard; the septa are rather thick and very broad, nearly meeting those of 
opposite sides at the bottom of the gyri, and rarely marked with a paliform lobe; at dis- 
tances of from 3 to 5 mm. along the gyri, paired opposite septa enlarge slightly and ap- 
parently separate the calicinal centres. The columella is narrow, subporous or trabeculate. 
The width of the gyri is from about 7 to 9 mm. and the depth from about 5 to 6 mm. 
Apparently the species is subject to great variation, the ridges becoming more or less 
triangular, the columella abundant, and the paliform lobes distinct. 
Very good drawings of the species are given in the Report on the Florida Reefs, 
plate ix. figs. 10 to 12. 
Locality.—Bermuda. 
2. Mzandrina sinuosissima, Milne-Edwards and Haime. 
Meandrina sinuosissima, Milne-Edwards and Haime, Cor., ii. p. 393. 
A single small specimen of this species was obtained. It is attached to the under 
side of the “form /” of Mzandrina strigosa, a species to which it is very closely allied, and 
1 See Pourtalés, Deep-Sea Corals, pp. 72 and 73, where much interesting information will be found. 
