EAELY PALEOZOIC BEYOZOA 01" THE BALTIC PROVINCES. 95 



may be superposed and thus form masses a millimeter or more thick, 

 an individual layer is not more than 0.35 mm. thick. As illustrated 

 in figure 30 a, the vertical section shows a very short, thin-walled 

 immature region which passes almost directly into an equally short 

 mature zone, where the walls are thickened and assume the ceramo- 

 poroid structure, and mesopores are introduced. Tabulae are wanting 

 in both regions. 



The view shown in the tangential section, figure 30 h, is precisely 

 the same that can be obtained by examination of the celluliferous 

 surface after it has been slightly etched and moistened. The lunaria 

 are rather indefinite in themselves, but the occurrence of three or 

 four distinct lunarial tubes along the posterior third of the zooecial 

 wall plainly indicates their position. That the lunarium is present 

 and arises into an arch and that the tubuli are distinct structures 

 is shown in the lower part of figure 30 h, where the section has cut, 

 only the most elevated portions of the zoarium. The distinctness 

 of these tubuli and the indistinctness of the lunarium itself is further 

 illustrated in figure 30 c. 



The zocecia are irregularly rhomboidal to subpolygonal, thin- walled, 

 and average 0.45 mm. in diameter. About four occur in 2 mm. 

 Mesopores are few, averaging less than one to a zoarium. 



The extremely thin incrusting zoarium, thin-walled, polygonal 

 zocecia, indistinct lunaria, and quite distinct lunarial tubuli are char- 

 acters which separate Anolotichia hrevipora from all other species of 

 the genus. 



Occurrence. — Kuckers shale (C2), Reval, Esthonia. 



Holotype.— Cat. No. 57202, U.S.N.M. 



Fragments and thin sections of the type-specimen are in the col- 

 lections of the British Museum. 



ANOLOTICHIA REVALENSIS, new species. 



Plate 6, figs. 4, 5; text fig. 31. 



Two well-preserved specimens, one an expansion of considerable 

 size and four or more milhmeters in thickness, incrusting a large 

 gastropod, and a second smaller and much thinner example parasitic 

 upon a cephalopod, form the types of this new species. The thin 

 sections figured below are of the larger specimen, while the thin, 

 smaller example is illustrated on plate 6. While these two type 

 examples show a parasitic growth for the species, it is possible that 

 other specimens will prove to be free, lamellate expansions. Zoaria 

 of the latter method of growth commence as parasitic expansions, 

 which, with increasing size, become free. 



The surface of this species is without conspicuous macular eleva- 

 tions, but the maculas are distinctly visible areas 4 mm. apart, from 

 which the zocecia radiate. The zocecia are conspicuously large and 



