LEPRALIA ADPRESSA. 307 



K VNGE IN TIME. Scotch Glacial deposits (Geikie) : 

 Paheolithic (A. Bell). 



In L. pertusa the shape of the orifice varies somewhat 

 from the generic type, but the structure is essentially the 

 same as in the other species with which it is associated. 

 Smitt ranks it amongst the Myriozoida ; but it wants the 

 distinguishing character of this family. Its peculiarity 

 is that the two lateral projections by which the orifice is 

 constricted are placed very close to the inferior margin, 

 which curves slightly outwards immediately below them ; 

 but there is no approach to a sinus. 



LEPRALIA ADPRESSA, Busk. 

 Plate XXXTII. figs. 5-7. 



LEPRALIA ADPRESSA, Busk, B.M. Cat. ii. 82, pi. cii. figs. 3, 4; Quart, Journ. 



Micr. 8c. iv. 178, pi. viii. fig. 6 (Zoophytol.) : Hincts, 



Devon & Cornw. Cat, Ann. N. H. ser. 3, ix. 205. 

 LBPRALIA LATA, Busk, Quart. Journ. Micr. Sc. iv. 309, pi. x. figs. 1, 2: 



Manzoni, Bryoz. Plioc. Ital., Contr. prim a, 4, pi. i. fig. 6 ; 



Supplem. Contr. prima, 8, pi. iii. fig. 2. 



Zoaecia lozenge-shaped or irregularly ovate, depressed, 

 quincuncial, surface punctate in young cells, minutely 

 granular at a later stage, sometimes obscurely reticu- 

 lated ; orifice narrow, much longer than broad, arched 

 above, contracted a little below the middle, inferior 

 margin straight; peristome slightly thickened, fre- 

 quently a knob on each side on a line with the lower 

 margin. Ocecia rounded, granular, closely united to 

 the cell above, occasionally umbonate. 



Colonies forming flat, compact, and inconspicuous crusts. 



Var. . Surface marked with grooves radiating from the 

 lower border of the mouth. 



x2 



