4, - MAZATLAN BRYOZOA 
6. LEPRALIA RostRATA, Busk, (n. s.) 
Cellulis immersis, superficie tuberculata seu granulata ; ore 
~mmMerse, Margine supertori tnconspicuo ; margine inferiori pro- 
Funde suleato ; aviculario magno, sessili, armato. 
The lower or interior margin of the mouth in the fully formed. 
cells, is deeply grooved in the middle; and on one side of the 
sulcus is a strong, short, blunt, spinous process; on the other 
a comparatively large raised avicularium, which faces towards 
the suleus, and whose mandible is acute and points upwards 
and outwards. The surface of the cell is often beset with short 
raised spines or processes ; and these, projecting over the mouth 
of the cell below, give it the appearance of being furnished with 
several oral spines. 
Hab.—Mazatlan ; on Imperator unguis; L’pool Col. 
Tablet 8 contains a group on Imperator.—9, one on base of do. 
7. LEPRALIA MARGINIPORA, Reuss. 
Fossil Polyp. d. Wiener Tertiar. Beck. p. 88, pl. 10, fig. 23. 
Cellulis ovatis, convexis seu subdepressis, immersis, asperulis, 
margine punctatis ; ore rotundo seu subelliptico ; margine sub- 
incrassato, singulo latere avicularium gerente. 
As the form appears precisely to resemble the tertiary species 
described and figured by Reuss, I have applied his name, and 
in great part employed his character. 
Hab.—Mazatlan ; on Imperator unguis; L’pool Col— Fossil, 
Vienna. 
Tablet 10 contains a group on hmperator. 
8. LEPRALIA HIPPOCREPIS, Bush, (n. s.) 
Cellulis immersis, superficie punctatis ; ore suborbiculari sew 
elliptico ; margine superiori cellularum natu majorum, tnconspi- 
cuo, inferiori et laterali incrassato utrinque avicularium gerente. 
The peculiarly horse-shoe shaped mouth of the older cells, 
sufficiently distinguishes the present from the preceding species, 
to which, in the mouth alone of the younger cells, it bears some 
resemblance. 
Hab.—Mazatlan ; on Imperator olivaceus ; L’pool Col. 
Tablet 11 contains a group on Imperator. 
