BERMUDA. 



27 



very abundant, and contribute largely to the reef formation. 

 While some species such as the great " Brain coral," (JDvploria 



LAND NEMERTIXE, TETRASTEMMA AGRICOLA. (YOUNG MALE.) 



Pt 1 — 4 Successive portions of the proboscis ; 1 entrance ; 2 papillary portion ; 3 pouch 

 of stylets ; 4 glandular p ntion ; ca muscular entrance of glandular portion ; 

 o mouth ; i intestine ; g ganglion ; n lateral nerves. 



(After a figure by Von Willemoes Suhm.) 



cerebriformis), which is conspicuous at the bottom as a bright 

 yellow mass appear to prefer to grow where the water is 

 lighted up by the sunshine ; other .species, such as Millepora 

 ramosa and Symj)hyllict dipsacea, seem to thrive best in the 

 shade. One species, Mycedium fragile, which forms very thin 

 and fragile plate-Like laminae, which are, when bleached white, 

 almost the most beautiful of corals, occurs growing in colonies 

 in great abundance, in water from a foot to a fathom in depth 

 inside small caverns. 



All around the Bermuda coast, wherever it is at all sheltered, 



