PHTLACTELLA EXIMIA. 359 



PHYLACTELLA I:\IM i \, Hincks. 

 Plate XLDL fig. 11. 



LKPRALIA EXIMIA, Hincks, Proc. Dubl. Univ. ZooL & Bot. Assoc. ii. pt. i. 



75, pi. iii. figs. 3, 3 a ; Quart. Journ. Micr. 8c., Zooph. viii. 



276, pi. xxi. figs. 3, 3 a : Peach, Journ. Roy. Inat. Cornwall, 



no. rviii. (1876), 2 (sep.), fig. 4. 

 PHYLACTELLA EXIMIA, Hincks, Ann. N. H. Feb. 1879, 161. 



Zocecia ovate, distinct, moderately convex, punctured, and 

 with an inconspicuous line round the edge; texture 

 dense, surface minutely granular ; primary orifice almost 

 semicircular, with a rounded tooth on the lower margin, 

 and two small lateral denticles, surrounded, except above, 

 by an elevated peristome, which rises on each side into 

 a broad, somewhat triangular expansion. Ooecia pro- 

 minent, globose ; surface smooth, covered with raised 

 punctures, silvery when fresh. 



Colonies growing in large spreading crusts, with a lobate 

 margin. 



HABITAT. On shell and stone from deep water. 



LOCALITIES. Coast of Antrim (Hyndman) : off the 

 Deadman (C. W. P.) : Shetland (A. M. N.). 



The cells are large and very distinct in the Antrim spe- 

 cimens; the ovicells are prominent; and the mode of growth 

 is decidedly lobulate. In the single specimen which I 

 have seen from Shetland the granular crust seems to be 

 more fully developed, the ovicells are subimmersed, being 

 partially invested by it, and the sutures between the cells 

 are less marked. The secondary mouth is somewhat qua- 

 drate in shape; and the wall-like peristome, which forms it, 

 slopes outwards in front, and at the sides usually rises into 

 broad expansions, pointed above, and often bending over 

 the aperture. The marginal punctures are frequently want- 

 ing. The ovicell is very smooth and silvery, and the walls 

 of the cell are thickly and minutely granulated. 



