in d. Naturf]^esch. d. nied. Tliiere währ. d. Jahre 1876—1879. 727 



tips of the branchcs. Gastropores with irregularly circular mouths, 

 often seated in depressions ; with a deeply seatcd style. The mouths 

 of the gastropores frequeutly covered by the dactylopore projections 

 inclined more or less over them. Sometimes the margin of the 

 gastropore itself is raised up on ooe side into a scale inclined over 

 the pore mouth, bat this is usually fused with ncighbouring dactylo- 

 pore projections. Ampullae on both sides of the flabellum; promi- 

 nent in the female. Gastrozooids cyliudrical, with four club-shaped 

 tentacles and four basal canals. Dactylozooids entirely retracted. 

 Gonophores, in the female, solitary in the gonangia. The free margin 

 of the cup-shaped spadix becomes converted into a ramified fringe, 

 embracing the embryo, as development proceeds. Planula as in 

 Pliobothrus. Structure of male Stocks unknown. Er. labiata n. sp. 

 Kio de la Plata. 



Lahiopora n, gen. Corallum minutely reticulate in texture, 

 composed of a few rounded branches with tapering extremities. The 

 entire surface covered with nariform projections, with elongate ca- 

 vities, which are arranged in rows along the lengths of the branches, 

 often disposed with great regularity for long Stretches. The pro- 

 jections of very uniform shape, and rising frora the branches to a 

 uniform hight. All inclined in the directions of the tips of the 

 branches. The elongate cavities, which are extended in the direction 

 of the lengths of the branches, have a defined rounded margin at their 

 ends, situated towards the tips of the branches, but gradually merge at 

 their opposite extremities in the deep and complex hollow^s by which 

 the surface of the coral is excavated, and which are made up of the con- 

 iluences of cavities of adjacent nariform projections with the other 

 irregularities of the surface. Dactylopores devoit of styles; two 

 kiuds present, larger and smaller. The nariform projections are 

 the outgrown margins of the larger dactylopores, which are conti- 

 nued into the substance of the corallum from the cavities of the 

 projections as tubulär pits. Tho smaller dactylopores have mouths 

 of the same general form as those of the larger ones, but with their 

 loDger diameters directed at right angles to these latter. They 

 have their walls fused with those of the nariform projections, or 

 often appear as if excavated in the sides of these. They are of 

 one-third or one-fourth the dimensions of the larger pores. Mouths 

 of the gastropores deeply seated in depressions at the bases of the 

 nariform projections. Circular in outline. Gastropores provided 

 with deeply seated styles with brush-like tips. No ampullae in the 

 unique species. Soft structure unknown. (Porella antarctica Gray, 

 fälschlich als Bryozoon beschrieben.) 



Spinipora n. gen. Corallum branching. Branches rounded. 

 •Entire surface thickly beset with long spiuous projections inclined 

 towards the tips of the branches so as to present spout-like openings, 



