366 ESCHARID2E. 



radiating in all directions from a central point, so that 

 there is a definiteness and regularity of pattern which is 

 usually wanting in M. Peachii. 



MUCRONELLA VARIOLOSA, Johnston. 

 Plate LI. figs. 3-7. 



LEI-RAMA 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. Ixiv. ; Crag. Pol. 48, pi. iv. fig. 4 

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



LEI-KALI A OVALIS, Hass. Ann. N. H. ix. 413. 



ESCHARELLA VARIOLOSA, Gray, B.M. Had. 125. 



? LEPRAUA CHEILOSTOMA, Boeck, Forh. Vid. Selsk. Christiana, 1861, 50. 



LEPRALIA SERROLATA, Eeuss, Bryoz. OBterreich.-ungarisch. Miocans, 27, pi. ii. 

 figs. 2, 3. 



LEPRALIA TENBKA, 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 24. Ooscia 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 usually they are much 



