LEPRALIA PALLASIANA. 297 



belonging to the same section_, we see the tendency to the 

 secondary development of the peristome which is so 

 strongly marked in this family. 



i. With a simple pi'iniari/ orifice only. 

 Genus LEPRALIA^ Johnston (part.). 



Der. Prom Xeirpa scurf, and akios marine. 



EscHARA (part.), auctt. 

 Lepralia (part.), auctt. 

 Lepralia, Smitt. 



Generic Character. — Zocecia usually ovate, with the 

 orifice more or less horseshoe-shaped, arched above, con- 

 tracted at the sides, and with the lower margin entire and 

 generally slightly curved outwards. Zoarium {in the 

 British species) incrusting, or rising iiito foliated expansions 

 composed of one or two layers of cells. 



Lepralia Pallasiana, Moll. 



Plate XXXIII. figs. 1-3 ; and Plate XXIV. fig. 4. 



EscHARA Pallasiana, MoU, Seerinde, 64, pi. iii. fig. 13. 



Cellepora Pallasiana, Lamx. Pol. flex. 95, no. 190. 



Flustra Hibernica, Hass. Ann. N. H. vi. 172, pi. vii. fig. 1 ; ibid. rii. 370. 



Lepralia pedilostoma, Hass. Ann. N. H. Tii. 308, pi. ix. fig. 4 (not the L. 



fedilostoma of Couch). 

 Lepralia pediostoma, Johnst. B. Z. ed. 2, 315, pi. iv. fig. 7. 

 Lepralia Pallasiana, Bu&k, Mar. Pol. ii. 81, pi. ixxxiii. figs. 1, 2 ; Crag 



Pol. 64, pi. ix. fig. 7 ; (var. armata) Quart. Journ. Micr. Sc. 



Zoophjtol., iv. 309, pi. xi. figs. 1, 2: HincJcs, Deron Cat., 



Ann. N. H. ser. 3, ix. 204 : Smitt, CEfy. K Vet.-E. Forh. 



1867, Krit. Fort. iv. 19 and 123, pi. xxd. fig. 93. 



Zocecia large, broad-ovate, distinct, coarsely punctured 

 over the entire surface, disposed in lines ; orifice ample, 

 longer than broad, arched above, contracted on each 

 side below the middle, lower margin slightly curved 



