in d. Naturgescli. d. uiod. Thieru währ. d. Jahre 1876—1879. 729 



dered horseshoe-shaped by the projection across it, in the direction 

 of the tip8 of tho branches, froin that aide of its margiu placed 

 uearest the bases of the branchea, of a tonguc-like excrescence. Am- 

 pullae in the male Stocks in a ring around the cyclo-system masses ; 

 nonc scattcred on the branches. Dactylozooids, whcn at rest, doubl- 

 ed down within the upper Chambers of the gastropores. Gastro- 

 züoids flaak-shaped, devoid of tentacles, with nnmerons basal canals. 

 Gonaugia in the male Stocks containing a central mass of cclls, frum 

 the surface of which arc doveloped as buds numerous pedicellate 

 lobular sacs, in which the spermatozoa are produced. Femalc Stocks 

 unknown. A. suhviridis n. sp. Meangis-Ius. 



Cryptohelia M.-Edw. = H. Corallum closely resembling that 

 of Astylus in all respects, excepting the cyclo-system masses are not 

 so preminent, that the opening between the upper and lower Cham- 

 bers of the gastropores is circular in outline, and that a lid-like 

 lamina of calcareous matter is directed horizontally across the mouths 

 of all the cyclo-systems. The lids are supported on stout columns 

 arising from the margin of the cyclo-systems and inclined over them. 

 They spring from the sides of the Systems nearest the bases of the 

 branches and are directed towards the tips of the branches. In 

 female Stocks ouly a single ampulla and gonangium developed in 

 relation with each cyclo-system. No ampullae on the connecting 

 branches. In the males several ampullae in the walls of each cyclo- 

 system. Soft structure as in Astylus. In female Stocks numerous 

 gonophores present in each gonangium in all stages of development. 

 Spadix cub-shaped, developing, as in Erinna, into a friuged network 

 at the margin. A solitary ovum developed in relation with each 

 spadix. Planula very long and worm-llke. 



Stenohelia Kent. Corallum delicate, branching flabelliform ; 

 pores in regulär cyclo-systems only. Cyclo-systems all turned to- 

 wards one face of the flabellum. Däctylopores without a columella 

 or with a very rudimentary one. Gastropores very deep and curv- 

 ed, so as to tabulate in all but the older branches the eutire 

 lengths of the axes of the branches; with small styles, seated at 

 the bottoms of these tubes and directed parallel to the axes of the 

 branches at right augles to those of the mouths of the cyclo-systems. 

 St. profunda n. sp. St. Thomas. 



Conopora n. gen. Corallum delicate; with pores in regulär 

 cyclo-systems; branching irregularly, the cyclo-systems having their 

 mouths turned in all directions. Cyclo-system masses conical in 

 form. Both kinds of pores devoid of a style. Gastropore with two 

 Chambers, the upper opening iuto the lower by a circular aperture. 

 Difiers from Cryptohelia and Astylus in having no lid or tonguelike 

 process and in not formiug a regulär flabellum. C. tenuis n. sp. 

 Kermadec-Ins. 



