270 PERCY SLADEN TRUST EXPEDITION. 
I refer three specimens to this species, measuring respectively 78, 47, and 11 mm. in 
diameter. The largest specimen, which was dead underneath when obtained, corresponds 
very closely to the specimen figured by Vaughan on pl. xxviii. figs. 2,2@. The middle- 
sized specimen has the lower surface much arched, and in correspondence with this the 
axial fossa is widely open, displaying a large, finely granular columella. The smallest 
specimen is still somewhat hexagonal in shape, but shows no scar of attachment ; it has 
five cycles of septa, but the primaries are still very prominent. 
Localities. Amirante Bank, E 21, 30 fms.; Saya de Malha Bank, C 15, 54 fms., and 
C16, 29 fms. Previously known from Andamans, China Sea (27-8 fms.), Philippines 
(10 fms.), New Britain (reef and 12-40 fms.), and Hawaii (48-68 fms., two specimens 
being from 68-253 fms.). 
Bourne (Ceylon Pearl Oyster Report, iv. p. 202) probably refers to this species under 
the name of Cycloseris tenuis, Dana. He gives no localities for his specimens, but it is 
to be presumed that they come from Ceylon. He places in its synonymy Cycloseris 
sinensis and CO. hexagonalis, which appear to me to be two entirely different species, as 
clearly indicated in my separate description of C. sinensis from Maldivan specimens. 
Bourne did not apparently see Déderlein’s Monograph of the genus Fungia, so that all 
his identifications of its species can only be accepted with great caution. This is the 
greater pity in that he had apparently plenty of well-preserved material, and his 
observations on the morphology and generic characters of his genera Cycloseris and 
Diaseris as compared with Fwngia would have been of the greatest interest. 
6. Fungia cyclolites (Lamarck). 
Cycloseris cyclolites, M.-Edwards et Haime, Hist. nat. des Corall. iii. p. 50, pl. D 12. fig. 3. 
Fungia cyclolites, Doderlein, Senckenb. naturfors. Gesellsch. Abhandl. xxvii. p. 77, t. 4. figs. 7-9 
and t. 5. figs. 5, 5 a. 
I refer thirteen Red Sea specimens of the Cycloseris-form to this species. They vary 
in diameter from 15-20 mm. and in height from 15-25 mm. The larger specimens 
certainly appear to belong to Fwngia cyclolites, but the smaller specimens approach 
those of /. patella and perhaps other species of the Cycloseris-group. 
All the larger specimens are slightly oval, arched, distinctly and evenly costate almost 
to the centre of their lower surfaces. Coste are present corresponding to all the septa, 
but those of the last cycle are very small and do not extend in for any distance from the 
edge of the disc; the rest are equal in size, low and finely toothed. The septa are 
almost equal in height at the edge of the disc, but differentiate into cycles towards its 
centre, the lower cycles becoming thicker and higher and extending in for different 
distances. In the largest specimens seven cycles are present and in the smaller five; of 
these the last is absent from many of the systems and is not ordinarily present in more 
than one half of any of them. The septa appear rough, being finely grained, the grains 
running out in vertical rows to their edges, which are finely but irregularly toothed. The 
axial fossa is somewhat elongated, being filled in below by a finely granular columella, 
CSO as 
