MEMBRANIPORID.E. 49 



giualibus supra munito. Ovicellula parva, erecta, spinis marginalibus dnabus utrinque 

 fulta. 



Cells quincuncial or in linear series ; ovate, ventricose, raised above ; surface smooth or 

 granular ; a single row of minute punctures around the base. Orifice arched above, con- 

 tracted below, with a broad median tooth within the lower border and 4 G marginal 

 spines above ; a strong pointed unibo close below the orifice ; ovicell small, erect, with 

 two marginal spines in front on each side. 



L. CILIATA (?), MS., S. 



LEPRALIA PEACHII, Jo/mst., Brit. Zooph., 2d ed., p. 315, pi. liv, figs. 5, G ; Busk, Brit. M. 



Cat., part ii, p. 77, pi. Ixxxii, fig. 4, and pi. xcvii. 

 IMMERSA, Johnst., op. c., p. 325, pi. Ivii, fig. 8. 

 ESCHARELLA IMMERSA, Gray. 

 BERENICEA IMMERSA, Fleming. 



Habitat. Cor. Crag, S. W., J. iS. B., on various shells, very abundant. (Recent) 

 Britain, from Orkney to the Isle of Wight ; Beaufort Dyke, 110 147 fms. 



The identity of this form with the recent L. Peachii admits, I think, of no doubt. 

 Like that species, it is very protean in habit, but the specific characters are usually 

 sufficiently marked to render its discrimination easy. These are : 1, the presence in most 

 cases of six oral spines ; 2, the large and usually flattened, but sometimes conical umbo 

 below the orifice ; 3, the appearance of the stumps at any rate, of two oral spines on each 

 side in front of the ovicell. 



18. L. VENTRICOSA, Hassctll. PI. VI, figs. 3, 6, 8. 



Cellulis supra suberectis, distantibus, constrictis, infra ventricosis, ad basim immersis ; 

 superficie granulosa, basirn circa serie punctorum unica plerumque ornatis. Orificio orbi- 

 ulari, dente bifido, interno infra armato; peristomate valde elevato, antice producto, 

 rostrato, 2 spinis marginalibus utrinque armato. Ovicellula parva, resupinata, subimmersa, 

 spina marginali unica utrinque fulta. 



Cells distinct and suberect above, immersed at the base ; ventricose below, much con- 

 tracted above ; surface granular ; a single row of punctures around the base ; orifice orbi- 

 cular, with a bifid denticle within the lower border ; peristome much raised, produced in 

 front into a prominent beak; four marginal spines, two on each side; ovicell small, 

 reclined, subimmersed, with a single spine on each side in front. 



LEPRALIA VENTRICOSA, Hassall; Johnst., Brit. Zooph., 2d ed., p. 305, pi. liv, fig. 5 ; Bush, 

 British M. Cat., part ii, pi. xci, figs. 5, 6; p. 78, pi. Ixxxii, figs. 5, fi; 

 pi. Ixxxiii, fig. 5. 



