76 DUBLIN UNIVERSITY 



ovicell small, depressed, closely united to the cell above it, surface finely 

 granular. 



On shell, coast of Antrim. 



III. L. disciformis, n. sp. (Hincks).* Plate III., Fig. 4, 4a. 



Cells ovate, punctured, ranged in lines, which radiate from a central 

 depression; mouth small, arched above, lower margin straight, with a notch 

 in the centre, peristome raised ; 4 to 6 spines round the upper mcvrgin ; 

 below the mouth, and a little to one side^ a mammillary prominence, bearing 

 on the top of it a minute avicularium, mandible pointing downwards; ovicell 

 recumbent, silvery, thickly punctured, its sides prolonged so as to surround 

 the mouth. 



In this curious species, which grows in rudely sub-circular patches, 

 the cells are regularly rowed, and radiate from a depression in the centre 

 of the polyzoary. The sides of the ovicell form a wall round the mouth. 



On shells, coast of Antrim. 



IV. Lepralia Woodiana (Busk). 



This species has been lately described and figured by Mr. Busk in 

 his " Monograph on the Polyzoa of the Crag," p. 42, pi. 7, figs. 7 and 8, 

 and was only known as a fossil previous to its occurrence amongst Mr. 

 Hyndman's Antrim dredgings. Prom this rich material I have obtained 

 one or two specimens on shell, which correspond in all respects with Mr. 

 Busk's figure. L. Woodiana must, therefore, take its place as a member 

 of our recent Fauna. 



Fossil. — Coralline Crag (Searles "Wood). 



Recent. — Coast of Antrim. 



* Since the above has been in type, I have learnt from Mr. Busk that the form here 

 described is the same as his L. discoidea, figured in the "MicroscopicalJournal," Plates 

 XXII. and XXVII. of the Zoophytology. These figures, however, do not fully repre- 

 sent the characters, and are superseded by the one which accompanies this paper, and 

 which is also from Mr. Busk's hand. To complete the description, the following addi- 

 tions must be made : — On one or both sides of the cell, when perfect, a peculiarly formed 

 avictdarium, with a very long dependent mandible. These are almost invariably wanting 

 in the older cells. The small subcentral avicvlarivm is also sometimes absent. 



The name discoidea, of course, has precedence, and has been inserted in the List of 

 Species. 



