54 
GUIDE TO THE CORAL GALLERY. 
Case 2 c, d. Stylaster sanguineus , or the “ Blood Coral ” from the Pacific 
Islands, is of a brilliant red colour. 
In Astylus (Fig. 18) the cyclo-systems all face one way. Grypto- 
helia pudica is remarkable for the little canopy which arches over 
each cyclo-system. 
Distichopora has the pores arranged in a triple row along each 
edge of the flattened branches, a central row of gastropores being 
enclosed between two parallel rows of dactylopores. Probably the 
various supposed species of Distichopora (l). coccinea, violacea, livida ) 
are colour variations of one species. 
Fig. 16. 1 
Enlarged view of the surface of a living Millepora, showing five dactylopore 
polyps surrounding a central gastropore polyp. (After Moseley.) 
III. MEDUSiE AND OTHER ALLIED FREE-SWIMMING 
CCELENTERA. 
Case 3, Glass models of Medusae or Sea-Nettles are exhibited in 
png part. ^ ^^g]^ p ar t 0 f Q ase g a i on g w ith specimens in spirit. Medusae 
have already been referred to in the account of Hydroida and 
of Millepora, where it was stated that in some species certain 
polyps carrying the eggs (generative polyps) became detached 
From_“ Encyclopaedia Britannica.’ 
