54 



GUIDE TO THE CORAL GALLERY. 



Case 2 c, d. 



Stylaster sangtiineus, 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. Crypto- 

 he/ia pudica is remarkable for the little canopy which arches over 

 each cyclo-system. 



I)istichoj)ora 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 {D. coccinea, violacea, livida) 

 are colour variations of one species. 



Fig. 16.' 



Enlarged view of the surface of a liviDg Millepora, showing five dactylopore 

 polyps surrounding a central gastropore polyp. (After Moseley.) 



III. MEDUSiE AND OTHER ALLIED FEEE-SWIMMING 



CCELENTERA. 



Case 3, Glass models of Medusae or Sea-Nettles are exhibited in 



pai . ^j^g upright part of Case 3 along with specimens in spirit. Medusse 



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.' 



