368 Mr. A. H. Hassall's Catalogue of Irish Zoophytes, 



long slender spines of nearly equal lengths ; the lateral walls of each 

 cell are prolonged into large, triangular, winged appendages, which 

 are hollow, and communicate with the interior of the cells. See 

 Plate IX. fig. o. These appendages are alvA^ays present. — A. H. H. 

 The front wall of each cell rises into the mouth in the form of a 

 strong pointed process. 



L. pedilostoma. Crust spreading irregularly ; walls of the cells 

 reticulated; aperture calceoliform ; margin plain, everted. — A. H. H. 



The crust of this species in a recent state is always of a red co- 

 lour. The cells are but little raised, and are closely approximated 

 to each other. Their divisions and arrangement are often rendered 

 unequal and irregular by the rough surface on which they are de- 

 veloped, being usually found in the crevices of rocks and on stones. 

 See Plate IX. fig. 4. 



Blackrock and Portmarnock : not uncommon. I have also found 

 specimens of this species adhering to the bottom of an old hulk, the 

 Olbers, in Plymouth Sound. 



L. insignis. Cells raised, ventricose ; aperture armed with from 

 five to seven spines. A long spinous process rises out of the cell, 

 low down and to one side. — A. H. H. 



This singular species is readily distinguished from all others by 

 the position of a sharp spine or tooth, which proceeds, not from near 

 the aperture, but low down, from the side of the cell, in the wall 

 of which a hole is visible if one of the spines be broken off. The 

 aperture of the cells describes Jtbs of a circle, the lower part being 

 straight. In addition to the spines which surround the aperture, 

 and which gradually diminish in length on each side, a short pro- 

 cess rises from the front of the cell, just below the aperture. See 

 Plate IX. fig. 5. 



Dublin Bay. 



L. cylindrica. Crust opaque; cells cylindrical; aperture circular, 

 plain, slightly contracted : a single broad triangular tooth rises from 

 the anterior wall of the cell just below its aperture. — A. H. H. 



This species bears a considerable resemblance to Berenicea hyalina, 

 from which, however, it is estranged by the opacity of the crust as 

 well as by the presence of the tooth. There is a neck or collar 

 joined to the aperture in B. hyalina not present in this. See Plate 

 IX. fig. 6. 



A single specimen on the root of Laminaria digitata, Dublin 

 Bay. 



L. punctata. Cells oval, not much raised; apertures subqua- 

 drangular, having the lower lip thickened and somewhat everted. 

 On each side of the opening of the cell a small triangular process is 

 seen, and from the upper margin of the aperture three or four short 

 teeth arise. The walls of the cells are perforated with small holes, 

 which give them a dotted appearance ; this is an invariable charac- 

 ter of the species. See Plate IX. fig. 7. — A. H. H. 



On stones, east of Kingstown harbour. 



L. linearis. Cells much depressed, radiating in lines from a 

 centre, and increasing in size towards the edge of the crust, upper 



