. Bulletin - United States National Museum. Science. 300 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. The most marked character seen in vertical sections or in longi- tudinal fractures is the great crinkling of the zooecial walls in the immature region and the almost entire absence of diaphragms in this and the mature regions. In the latter the zooecial walls thicken greatly, the crenulation is less marked or disappears entirely, and acanthopores are developed. Mesopores, which occur only in the mature region, are distinguished with difficulty on account of their similarity to the ordinary zooe
. Bulletin - United States National Museum. Science. 300 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. The most marked character seen in vertical sections or in longi- tudinal fractures is the great crinkling of the zooecial walls in the immature region and the almost entire absence of diaphragms in this and the mature regions. In the latter the zooecial walls thicken greatly, the crenulation is less marked or disappears entirely, and acanthopores are developed. Mesopores, which occur only in the mature region, are distinguished with difficulty on account of their similarity to the ordinary zooecia. The thick walls, small acantho-. FlG. 184.—ANAPHEAGMA MIRABILE COGNATA. a, VIEW OF FKAGMENT, NATURAL SIZE; 6, TANGENTIAL SECTION, X20, WITH WALL STRUCTURE PLAINLY MARKED; C AND d, VERTICAL SECTION, X8, AND A POR- TION, X20. WASSALEM BEDS (D3), UXNORM, ESTHONLi. pores, and the black line separating adjoining zocBcia, are well shown in tangential sections. The present species differs so much from associated ramose bryo- zoans in the practical absence of diaphragms and the strong, crenu- lated walls, that comparisons are unnecessary. Critically compared with AnapJiragma mirabile, however, it is found to agree in growth, thickness of zooecial walls, and in most of the internal characters, differing only in that the walls are more crenulated and that the zooecia are a trifle smaller. These differences are possibly of specific. 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; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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