ZOOLOGICAL AND BOTANICAL ASSOCIATION. <5 



in texture. Tho size and distinctness of the cells, the ubsence of tho 

 calcareous expansion, tho shape of the ovicell, and the want of spines and 

 avicularian appendages, are constant characters which separate this spe- 

 cies from M. Flemingii. 



Common on shells, &c. Coast of Antrim (Mr. Hyndman). 



II. Membranipora solidula, nov. sp. (Alder and Hincks). 



Cells oval, with membranous covering, opaque, and rather solid; mar- 

 gin delicately beaded, set round with many spines ; ovicell ? 



The cells of this species are of an oval shape, very slightly produced 

 above. The margin, which is scarcely raised, is adorned with a very 

 delicate and pretty beading. The covering of the cell is altogether mem- 

 branous, and lies very much on a level with the margin, so that the 

 polyzoary presents a very flat surface. Commonly, four spines are pre- 

 sent at the upper end of the cell, but in some cases the margin is armed 

 with them throughout. The texture is peculiar, and the polyzoary has 

 a dull and somewhat waxy appearance. 



Antrim, on shells. 



Genus. Lepralia. 



I. Lepralia eximia, n. sp. (Hincks). Plate III., Figs. 3, 3a. 



Cells large, ovate, distinct, granular, punctured round the margin ; 

 mouth subquadrate, with a raised peristome, rising into a point at each 

 side, a broad, rounded denticle within the lower margin ; ovicell globose, 

 prominent, punctured. 



This fine species, which grows in irregular lobulate patches, has large 

 and well-defined cells, granular, and with a single row of punctures 

 round the margin; they are disposed in regular lines. The orifice, 

 which is rudely quadrate, has a raised peristome, which rises at each side 

 into a point, and within the lower margin there is a single broad and 

 rounded denticle. The ovicell is globular and thickly punctured. My 

 specimens exhibit neither spines nor avicularia. 



Dredged by Mr. Hyndman off the coast of Antrim. 



II. Lepralia alba, n. sp. (Hincks). Plate III., Fig. 2, 2a. 



Cells subovate, broad, somewhat depressed, granular ; mouth rounded 

 above, lower margin straight, with a central notch; an avicularium on each 

 side, about half way down the cell, mandible acute, pointing upward ; 



