78 MARINE POLYZOA. 



Berenicea immersa, Flem. Brit. Anim. 533. 



? Berenicea flava, Johnst. Trans. Newc. Soc. ii. 268. 



Hab. Start Point, J. S. Bowerbank. Orkney, Lieut. Thomas. 

 Coast of Devon, Miss Cutler. Belfast Bay, 20 to 35 fathoms, 

 W. Thompson. Compton Bay, Isle of Wight, id. Dalkey, 

 id. Beaufort Dyke, 110 to 147 fathoms, Captain Eeechey. 



Notwithstanding the apparently marked distinction between 

 the typical forms of L. variolosa, L. ventricosa, and L. Peachii, 

 some difficulty wdll be found in distinguishing them under cer- 

 tain conditions of age and overgrowth, or when much worn. In 

 L. variolosa the ovicell is always deeply immersed, and has in 

 front of it a single spine, or the stump of a single spine only, on 

 each side ; the normal number of oral spines in this species ap- 

 pearing to be two to three (in the former case it constitutes, as 

 I imagine, L. ovalis, Hassall). In L. Peachii the ovicell is also 

 immersed, but not so deeply, and always has two, or the remains 

 of two, oral spines on each side in front of it, the normal number 

 of these spines being, in this species, six ; w 7 hilst in L. ventricosa, 

 besides the more erect position, generally, of the upper part of 

 the cell, the greater elevation of the mouth, &c., the ovicell is, 

 comparatively speaking, free or much raised, shows, I believe, 

 no spine in front of it, or one only, and the number of oral 

 spines is invariably, or nearly so, four. With respect to the asso- 

 ciation of L. Peachii and immersa, Johnst., there can, I think, 

 upon inspection of the figures in Brit. Zooph., be no doubt of 

 its propriety. 



29. LEPRALIA VENTRICOSA. PL LXXXII. figs. 5, 6. PL 

 LXXXIII. fig. 5. PL XCI. figs. 5, 6. 



Cells distinct above, or raised, immersed at the base, ventri- 

 cose, ovate or subglobose; mouth orbicular, with a thickened 

 raised margin ; a bifid denticle on the lower lip, and four (rarely 

 more) marginal spines ; surface granular or irregularly striated ; 

 usually a pointed or broad mucro in front of the mouth. Ovicells 

 globular, prominent. 



Lepralia ventricosa, Hassall, Ann. fy Mag. Nat. Hist. vii. 412; 



Johnst. Hist. Brit. Zooph. ed. 2. p. 305. t. 54. fig. 5 ; Gray, 



List Brit. Rad. p. 118. 

 Hab. Start Point, J. S. Bowerbank. Belfast Bay, W. Thompson. 



Strangford Loch, id. Beaufort Dyke, 110 to 147 fathoms, 



Captain Beechey. 



30. LEPRALIA MELOLONTHA. PL LXXXV. fig. 3. 



Cells distant, in linear series, obovate ; a pointed conical 



