j i GUYNIA ANNULATA. 



DIASERIS M.-Edw. & H. 

 Diaseris crispa Pctort. 

 Barbados, 100 fathoms. 



MYCEDIUM Oken. 



Mycedium cailleti Duch. & Mich. 

 /'/. TXfigs. i. .-. 

 Barbados, 100 fathoms. A dead specimen. 



Order 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 Kugosa. It is 

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

 present the two following genera are kept under this head. 



GUYNIA Duncan. 



Guynia annulata Dcnc. 



/'/. TX.figa.8, ;. 



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



having the coshr- much less apparent. The attachment of one of the septa 



to the columella seems to be mure the exception than the rule, at least 1 



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



Barbados, 100 fathoms, rather abundant A do/en specimens wen' found 

 attached to :i stone three incites in diameter. 



DUNCANIA v a. 



Co rail um attached, cylindrical, covered with a thick wrinkled epitheco 

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

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



Differs from Haplophyllin Pourt (non Aplophyllin D'Orb.) by the formation 

 of tin 1 columella. From Tbecocyathus, with which it might he confounded 

 by the genera) appearance, if is easily distinguished by it-; very different epith- 

 eea. anil by the arrangement of the Beptn, which show no definite Systems 



and no derivation from a primarv hevmieral division. 



