CELLEPORIDiE : LEPRALIA. 325 



licle marked with tlie raised lines which are to form the partitions 

 between the future cells. 



So. L. iMMERSA, cells ovate immersed in the crust, with 

 roundish apertures having a tooth on the proximal and several 

 spines on the distal margin. G. J. 



Plate LVII. Fig. 8. 



Berenicea imraersa, Flem. Brit. Anim. 533. — Berenicea flava, Jolmston in Trans. 

 Newc. Soc. ii. 268. — Lepralia immersa, Johns. Brit. Zooph. 280. pi. 34. fig. 8. 

 W. Thompson in Ann. N. Hist. v. 253. Couch Corn. Faun. iii. 118. 



Hah. On shells and stones from deep water, frequent. 



Crust rather thick, spreading irregulai-ly, ochre-yellow, or some- 

 times cream-yellow, roughish and punctured to the naked eye by 

 the apertures of the cells which do not radiate from a centre, though 

 arranged in regular series. They are ovato-ventricose and frosted, 

 but commonly immersed in the crust so that their divisions are 

 indistinct ; the apertures contracted with a tooth on the upper edge 

 and several spines on the lower margin which are very brittle and 

 liable to be broken off, but when entire are rather longer than the 

 diameter of the cell. 



The oral spines encircle two-thirds of the aperture. Towards the 

 centre of the crust they are not longer than the diameter of the cell 

 and pretty equal in general ; but those on the inferior edge of the 

 marginal cells, where these are protected or new, are always much 

 longer. From this circumstance this species may be easily con_ 

 founded with Lep. ciliata, from which it differs in having a thicker 

 and more solid texture, in forming larger leprous patches, in the 

 much less distinctness of the cells, in the aperture having no rim 

 but a slight projection or denticle in the upper margin, and in there 

 being no knob behind it. The species is nearly allied to Lep. vario- 

 losa in habit and texture. 



36. L. vioLACEA, crust purplish ; cells ovate, glistening, 

 roughish, ivith a contracted round and unarmed aperture, and 

 an obtuse mucro behind the upper margin. E. Forbes. 



Plate LVII. Fig. 9. 



Hah. On Nullipora3 from the Isle of Man, E. Forhes. On a 

 laver-covered stone from the Coast of Cornwall, (7. W. Peach. 



Polypidom forming a lavender-purple closely adherent crust of a 



