366 ESCHARIDiE. 



radiating in all directions from a central pointy so that 

 there is a definiteness and regularity of pattern which is 

 usually wanting in M. Peachii. 



MUCROXELLA VARIOLOSA, JohustOU. 

 Plate LI. figs. 3-7. 



Lepralia variolosa, Johnst. B. Z. 278, pi. xxxiv. fig. 4 ; ibid. ed. 2, 317, 

 pi. Iv. fig. 9 (? fig. 8) : Couch, Corn. Faun. iii. 116 : Busk, 

 B.M. Cat. ii. 75, pi. Ixxv. ; Crag. Pol. 48, pi. iv. fig. 4 

 (? fig. 8), & pi. viii. fig. 8. 



Lepralia ovalis, Hass.A:an. N. H. ix. 413. 



EscHARELLA VARIOLOSA, Gray, B.M. Ead. 125. 



? Lepralia cheilostoma, BoecJc, Forh. Vid. Selsk. Christiana, 1861, 50. 



Lepralia serrulata, Eeuss, Bryoz. osterreich.-ungarisch. Miocans, 27, pi. ii. 

 figs. 2, 3. 



Lepralia tenera, id., ibid. 27, pi. ii. fig. 4. 



Zocecia lozenge-shaped or ovate-elongate^ often much pro- 

 duced and narrowed below, flattish, distinct, but not 

 deeply sutured, sometimes subimmersed, granular, quin- 

 cuncially arranged, punctured or strongly areolated 

 round the base, and bordered by a raised line ; orifice 

 suborbicular, slightly elongated transversely, a hammer- 

 shaped denticle within the lower lip ; peristome raised, 

 thin, everted in front, and usually extended into a cen- 

 tral mucro ; marginal spines 2-4. Ooecia somewhat 

 oval, depressed and immersed, closely united to the 

 adjacent cell, granular, areolated round the margin, 

 usually with one spine in front on each side. 



Primary cell minute, with an oval aperture occupying the 

 whole of the front surface, bordered by a slight rim, and 

 surrounded by ten or eleven spines. 



Colonies forming very large, bright, glistening crusts, 

 white or straw-coloured. 



Range of Variation. The cells are, in some cases, broader 

 and shorter than in others : but usuallv thev are much 



