Deep-sea and Shalloio-water Hydrozoa. I7 



furrows, about 1 millim. in diameter from the extreme outer 

 edges of the dactjlopores ; by the verj large gastropores 

 slightly elongated in the direction of the furrow ; by the very 

 small dactylopores which are placed on the distinctly raised 

 ridge of the furrow but above which the separate dactylo- 

 pores are but slightly prominent except at the apical parts ; 

 by the papillose gastro-canal ; and by the smooth outer surface 

 of the massed ampullse which are neither roughened by ridges 

 nor lined by regularly- arranged pored openings. 



Distichopora coccinea^ Gray. 



D. coccinea may be distinguished by its flabellate ccenos- 

 teum with much compressed branches and branchlets, crowded 

 on their faces with numerous short often tuberculate young 

 branchlets, which at first are perpendicular to the general 

 plane of the coenosteum ; by its dull crimson-red colour j 

 by its smooth surface ; by the small and shallow but 

 distinct lateral furrow ; by the small gastropores which lead 

 into a smooth canal and are separated by rather wide parti- 

 tions ; by the very minute dactylopores which are not raised 

 above the general surface and which are separated by distances 

 generally greater than their own diameter ; and by the di- 

 stinctly raised ampullge which are smooth on their upper 

 surface and are surrounded at their base by a circle of com- 

 paratively large pored openings which lead to the central 

 cavity and which are separated by septiform partitions passing 

 to neighbouring ampulla? or to the surrounding ccenenchyma. 



Distichopora rosea^ Kent. 



D. rosea is distinguished by its irregularly flabellate coenos- 

 teum with rounded, thick, obtuse branches and branchlets ; 

 by its smooth surface which becomes slightly granulated 

 with obtuse conical eminences towards the apical parts ; by 

 its deep peach-blossom red colour ; by its extremely wide, deep, 

 distinct lateral furrows which are interrupted at the angle of 

 branching ; by its comparatively small unequal gastropores, 

 unequally and often widely separated ; by the obsoletely 

 papillose gastro-canal ; by the extremely large dactylopores 

 (easily distinguishable by the naked eye), the inner margin 

 failing, so that the pore opens into the furrow while the outer 

 and lateral margins are much elevated and thickened ; and by 

 the ampullas, which are undistinguishably massed together in 

 large raised groups with minute pored openings scattered 

 over the irregularly granulated upper surface. 

 Ann. & Mag. N. Ih'st. Ser. 5. Vol. xvi. 2 



