246 • PROFESSOR P. M. DUNCAN ON THE 



want of costse ; and others have them moniliform or multigranular ; and a partial epi- 

 theca is found in Pamcyatlms africanus. The bathymetrical range is great, or from 

 480 fathoms to a few feet below tide-mark. 



The Flahellum is allied to the common form in the Sicilian Tertiaries, Flabellum 

 siciliense. 



Genimulatrochus simplex is a species of a new genus formed to admit budding Tur- 

 binoliidfe without pali. The buds do not fall off, as in Blastotrochus, but remain 

 attached to the side of the parent corallum, and grow. 



The new genus BlastosmiUa is a remarkable one, on account of the repeated gem- 

 mation from a parent, the presence of endotheca, and the rudimentary costse and 

 columella. 



The remarks on Garyophyllia calveri and C. pourtalesi, species which were described 

 in the former essay, are included in the notice of them in the description of the species. 



These 12 species, added to the 30 described in the former essay, bring the number 

 of species of deep-sea corals dredged up in the voyage of H.M.S. 'Porcupine' to 42. 

 They include a large and predominating number of Turbinoliidse ; and there is no 

 instance of any form possessing cellular exotheca or exothecal structures binding 

 together the corallites, as in reef-buUders. One of the species newly described is allied 

 to a fossil form ; and thus the alliances with the old coral faunas stand : — 42 species 

 found in the recent fauna ; 9 of them lived in the Pliocene, 1 in the Miocene, 1 in the 

 Cretaceous, and 5 of the species have alliances with the corals of former ages. 



The resume of the peculiarities of the deep-sea corals given in page 337 of the former 

 essay is shown to be correct by the study of the forms described in this. 



