126 On Marine Pohjzoa. 



ing, which is small and bounded by a raised projecting 

 margin, which embraces the orifice on each side ; surface 

 smooth and silvery, with very delicate stria3 radiating from 

 the base towards the opening. 



A very pretty, subhy aline, and lustrous form. 



Loc. Australia, on weed (^Miss Jelly). 



Schizoporella aperta^ n. sp. (PI. V. fig. 3.) 



Zocecia ovate, disposed in lines, very convex, especially 

 towards the orifice, depressed below, sutures deep ; surface 

 roughened or minutely reticulate ; orifice arched above, lower 

 maro'in straight, with a rounded central sinus, contracted at 

 the opening by two small projecting points, peristome not 

 raised ; immediately below the orifice a short rostrum, and on 

 one side of it an avicularium with rounded mandible ; large 

 avicularia distributed rarely amongst the cells, elongate, 

 raised, the beak rounded at the extremity, often projecting 

 considerably beyond tlie elevation on which the appendage 

 rests, the edge on each side towards the apex dentate ; man- 

 dible smooth, of a light horn-colour, arched, except towards 

 the point of origin, where it is flattened, very slightly attenu- 

 ated towards the point, which is rounded. Ooscium cucullate, 

 entirely open in front, the opening arched and somewhat 

 elongated (taller than broad) ; surface slightly roughened. 

 Zoarium. whitish, of delicate texture. 



Loc. Singapore or Philippines, on shell [Miss Jelly) . 



Family Escharidas (part.), Smitt. 



PORELLA, Gray. 



Porella rostrata^ Hincks. (PI. V. fig. 2.) 



I have received from Miss Gatty a fine specimen of this 

 form, on which the ooecia are present ; the following must be 

 added to the diagnosis previously given (' Annals ' for Nov 

 1880) :— 



Ocecium very ample, covering a large part of the cell above, 

 broad, rounded ; surface smooth and shining, thickly covered 

 with tall blunt papillte. 



It should also be noted that the surface of the zooecium is 

 more or less punctured. 



