44 GUYNIA ANXULATA. 



DIASEEIS M.-Edw. & H. 

 Diaseris crispa Vnvw?. 

 Barbados, 100 fathoms. 



MYCEDIUM Oken. 

 Mycedium cailleti Ducn. it Mich. 

 PI IX Jigs. 1,2. 

 Barbados, 100 fathoms. A dead specmien. 



Oeder RUGOSA M.-Edw. & H. 



It must remain as yet an open question if the arrangement of the septa 

 in four systems instead of six is a criterion of the order of Eugosa. It is 

 not unusual among the Stylina?, which cannot well be placed here. For the 

 present the two following genera are kept under this head. 



GUYNIA Duncan. 



Guynia annulata r)u>fc. 



PL JX. Jigs. 3, 4. 



The Barbados specimens differ very slightly from Dr. Duncan's figures in 

 having the costae much less apparent. The attachment of one of the sejita 

 to the columella seems to be more the exception than the rule, at least I 

 never find it in well-developed specimens with free calicle. 



Barbados, 100 fothoms, rather abundant. A dozen specimens were found 

 attached to a stone three inches in diameter. 



DUNCANIA N. G. 



Corallum attached, cylindrical, covered with a thick wrinkled epitheca 

 rising over the border of the calicle. Interseptal chambers filling up solidly 

 from the bottom, a multiple pillared columella. Sometimes paliform lobes. 



Differs from Hnplophyllia Pourt. (non Aplophyllia D'Orb.) by the formation 

 of the columella. From Thecoeyathus, with which it might be confounded 

 by the general appearance, it is easily distinguished by its very different epith- 

 eca, and by the arrangement of the septa, which show no definite systems 

 and no derivation from a j^rimary hexameral division. 



