REPORT ON THE HOLOTHURIOIDEA. 
21 
(Mus. Holm.) Two specimens from Fiji Islands, agreeing in all respects with those 
described by Semper. Colour uniformly reddish-brown or dark brown, which 
colour seems to characterise this species from the following three, which are 
marked with spots, bands, or shades of a darker colour on a lighter ground. 
So far as I can discover, the digits of the tentacles are united by a distinct 
web. Cartilaginous ring absent, but the tentacular canals are united by a 
web, excepting in the calcareous ring, where openings are left between them. 
Numerous small simple madreporic canals and Polian vesicles round the water- 
vascular ring. 
Synapta grisea, Semper, 1868. 
Digits of the tentacles free. Numerous Polian vesicles. Deposits like those in the 
preceding species, but the miliary granules are much more numerous and 
aggregated. 
Habitat . — Boliol (Semper), Fitzroy Island and Queensland (Bell), Indian Ocean 
(Ludwig). 
(Mus. Holm.) Two specimens dredged at Bowen, differing mainly homSyyiapta glabra 
in the colour, which, like that in Syjiaj^ta hesclii, is marked with spots, bands, and 
shades of a darker greenish-gTcy colour on a lighter dirty ground, and by 
possessing numerous rosette-shaped miliary granules collected in masses. 
Synapta serpentina, ■]. Mliller, 1850 and 1854; Semper, 1868. (1) Synapta raynaldi, 
Held, 1857. {V) Synapta intestinalis, Held, 1857. 
This species seems to agree in all points with Synapta grisea, excepting with regard 
to tlie calcareous ring, which presents some small differences. They may 
probably be identical. 
Habitat . — Celebes (iMuller), Zanzibar (Selenka). 
(8. One or several madreporic canals. 
Synapta lappa, J. Muller, 1850 and 1854. 
Digits of the tentacles free. Numerous Polian vesicles. Anchor-arms smooth. 
Anchor-plates with seven large dentate holes, and two large and some minute 
smooth holes. 
Habitat . — West Indies (Muller). 
In 1850 Muller speaks of but a single madreporic canal, but in 1854 he says that one 
or several may be present. The miliary granules have probably been overlooked- 
The anchor-plates differ from those in the three preceding species in the presence 
of the two larger smooth holes at the handle. 
