EARLY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 



163 



differences in the size and shape of the zooecia. Still it is believed 

 that this close similarity does not indicate a correspondingly close 

 relationship and that Rhombopora esihonise is simply an early expres- 

 sion of the general generic type which did not endure. 



c / I- ' 



s»lc-.; 











Fig. 82.— Rhombopoea esthoni^. a, feagment of zoaeixtm, natural size; 6, tangential section, 

 X20; c, portion of another tangential section, X20, cutting a macula; d, vertical section, 



X20; e, TEANSVEESE SECTION, X20. JEWE LIMESTONE (Dl), BaRON TOLL'S ESTATE, ESTHONIA. 



Genotype. — RJiombopora lepidodendroides Meek. 

 (Upper Pennsylvanian) of the United States. 



Carboniferous 



RHOMBOPORA ESTHONLE, new species. 

 Text fig. 82. 



Zoarium a smooth, cylindrical stem, 2 to 3 mm. in diameter, 

 branching dichotomously at intervals of 15 mm. more or less. Zooe- 

 cial apertures ovate, averaging 0.20 mm. in length and 0.11 mm. in 

 width, arranged in irregular series, with, however, a tendency to 

 longitudinal rows. Measuring longitudinally, four to five zooecia in 2 



