. Bulletin - United States National Museum. Science. 324 BULLETIN" 11, UNITED STATES NATIONAL MUSEUM. species of this genus the walls are gently undulated, but in this form the undulations are so sharp that they are in reality angular. Occurrence.—Rare in rocks supposed to be of Lower Trenton age on Big Island, Lake Winnipeg, Canada. Apparently common in the Chasmops limestone at Nittsjo Ratvik, Dalarne, Sweden, and south of Bodahamn, island of Oeland. Plesiotype.—Chi. No. 57415, Fig. 201.—Diplotrtpa westoni. a and 6, side and basal views of a zoaeium, natural size; c, tan- gent
. Bulletin - United States National Museum. Science. 324 BULLETIN" 11, UNITED STATES NATIONAL MUSEUM. species of this genus the walls are gently undulated, but in this form the undulations are so sharp that they are in reality angular. Occurrence.—Rare in rocks supposed to be of Lower Trenton age on Big Island, Lake Winnipeg, Canada. Apparently common in the Chasmops limestone at Nittsjo Ratvik, Dalarne, Sweden, and south of Bodahamn, island of Oeland. Plesiotype.—Chi. No. 57415, Fig. 201.—Diplotrtpa westoni. a and 6, side and basal views of a zoaeium, natural size; c, tan- gential SECTION, X8, THROUGH A MACULA AND ADJODUNG ZOCECIA; d, PORTION OF THE SAME SECTION, X20; e, VERTICAL SECTION, X8, CUTTING A MACULA; /, SEVERAL TUBES OF THE SAME, X20, ILLUSTRATING THE ANGULARLY BEADED MESOPORES, THE REPLACEMENT OF A MESOPOEE BY A ZOOECXUM, AND THE TABU- LATION OF BOTH SETS OF TUBES. MIDDLE ORDOVICIAN (CHASMOPS) LIMESTONE, NiTTSJO RaTVIE, Dalarne, Sweden. British Museum, specimens from the island of Oeland and thin sections of the figured specimen. Family HALLOPORID^, new name. This new name in place of Calloporidse becomes necessary through the substitution of Hallopora for the preoccupied Callopora. The family includes those integrate trepostomatous bryozoans in which the zooecial tubes are thin-walled and attain their full size slowly,. 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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