ÖFVERSIGT AF K. VETENSK.-AKAD. FÖRHANDLINGAR 1900, N:0 1. 11 



Recent. 



According to Count PouRTALés in his various papers on the 

 Corals of the Atlantic off N. America there have been found not 

 less tlian tliree recent species of this genus. 



Thecocyatlius cylindraceus PoURTALÉS, 



1868. Contributions to the Fauna of the Gulfstream, p. 134. 

 1871. lUustrated Catalogue of Deep Sea Corals, p. 13, pl. II, fig. 



14—15. 

 1874. Zool. results of the Hassler Expedit., p. 37. 

 1880. Second. Eept. of the »Blake» Exped., p. 101. 



The description in the »Tllustr. Catal.» is well in concor- 

 dance with the generic description of the older species as to well 

 to permit its admittance within that genus. It is said that the 

 coluniella is formed of a dense niass of papillose processes, 

 arranged in ratlier indistinct roios, coinciding with the »pali». 

 But in turning to the figure cited, we find a totally different 

 columella, of stränge aspect, consisting of seven triangulär lappets 

 like petals closed, and no . papillse. In consequence it is not 

 possible to regard the originals to this figure as appertaining to 

 the same species nor genus as that described in the letter press 

 and only the description may be taken as referring to a true 

 Thecocyathus. 



It has been found in a depth of 315 fathoras on the Florida 

 reef, and off Havanna and Barbados. 



Thecocyathus loevigatus POURT. 



1871. Illustr. Catal., p. 14, pl. Y, f. 3—4. 



1878. Rept. on the dredging operations of Blake, p. 202. 



In the same way as in the preceding species the description 

 does not agree with the figures, but if we rely on the former, 

 this must be a real Thecocyathus. Found in 315 fathoms on 

 the Florida reef. 



Thecocyathus recurvatus PoURTAL. 

 1878. Rept. of Blake, p. 202. 



No figure. Off Havanna in 175 fathoms. 



It would have been desirable here to make a research as to 

 the affinities of the genera Thecocyathus and Trochocyathus but 



