154 



THREE CRUISES OF TIIK "BLAKE." 



bean. The specimens of Fnnyi symmetrica, and Uiaseri* 



crispa (Fig. 477), if found in a sea where 

 larger Funffise were common, would natu- 



O O ' 



rally be considered as the young of one of 



them. 



Antillid ( j xjtl(uiat(i (Fig. 478) is the 



first species of this tertiary genus found 



living. 



Attached to the test of an Asthenosoma, 



from a depth of 373 fathoms near Montser- 

 rat, came up a fine specimen of the delicate Leptonemus dis- 

 cus (Fig. 479), in which the corallum is reduced to a mere lace- 

 work. 



Fig-. 478. Antillia ex- 

 planata. f. (Pourtales.) 



Fig. 479. Leptonemus discus. | . (Challenger.) 



Among corals recalling extinct types are specially to be men- 

 tioned Haplophyllia (Fig. 480), Duncania, and 

 Guynia, which were surmised by Pourtales to be- 

 long to the Eugosa, an order established by Milne- 

 Edwards and Haime for a large number of fossil 

 corals, abundant in palaeozoic times. Their chief 

 characteristic is the development of the septa from 

 four primary ones (Fig. 481), whilst in all of the 

 living corals the primary number is six. In addi- 

 tion, the chambers are closed by floors. Ludwig 

 has shown, however, that this tetranieral arrangement of the 



Fig. 480. 

 Haplophyllia 

 paradoxa. -I . 

 (Pourtales.) 



