. Bulletin - United States National Museum. Science. EAKLY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 257 This species is most closely related to Orhipora solida, agreeing with it in all characters save the larger size and fewer number of its acanthopores and its much smaller zoarium. A glance at figures 148 and 149 will indicate that in spite of their similar characters, the tangential section of each is quite distinct. The associated Orhipora. Fig. 149.—Oebifora acanxhophoea. a, the type-specimen, natural size; b, tangentul section, X20, ILLUSTRATING THE IBREGULAB ZOCECIA AND NUMEROUS LARGE
. Bulletin - United States National Museum. Science. EAKLY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 257 This species is most closely related to Orhipora solida, agreeing with it in all characters save the larger size and fewer number of its acanthopores and its much smaller zoarium. A glance at figures 148 and 149 will indicate that in spite of their similar characters, the tangential section of each is quite distinct. The associated Orhipora. Fig. 149.—Oebifora acanxhophoea. a, the type-specimen, natural size; b, tangentul section, X20, ILLUSTRATING THE IBREGULAB ZOCECIA AND NUMEROUS LARGE ACANTHOPORES; C, SEVERAL ZOCECIA OF THE SAME SECTION, X20, SHADED TO BRING OUT THE CLEAR TISSUE OF THE ACANTHOPORES AND THE AMALGAMATED WALL STRUCTURE MORE PIAINLY; d, VERTICAL SECTION, X20, WITH STRUCTURE OF WAIJS AND ACANTHOPORES. LOWER ASAPHUS LIMESTONE, HALLt>DDEN, ISLAND OF OELAND. indenta has much smaller zooecia, thinner walls, and smaller acantho- pores projecting far into the zooecial cavity. Occurrence.—Rare in the lower Asaphus limestone at Halludden, island of Oeland, Baltic Sea. The type-specimen and figured tliin sections are in the collections of the British Museum. ORBIPORA INDENTA, new species. Text fig. 150. On account of the deep indentation of the zooecial cavity by nu- merous small acanthopores, a zoarium of this species often gives the impression of a septate coral like Tetradium. Thin sections, how- ever, show that the minute structure is precisely as in the other species here referred to Orhipora. The zoarium of the type-specimen is a small, elongate, dome-shaped mass, 14 mm. in height and 9 mm. wide, with the usual epithecated flattened base. The surface is smooth and without perceptible. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonia
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