. Bulletin - United States National Museum. Science. 344 BULLETIN 11, UNITED STATES NATIONAL Fig. 219.—Dianulites apiculatus. a to d, fotje VIEWS OF EICHWALD'S .TYPE OF CHjETETES apiculatus; e, celluliferous surface en- larged. (After Eichwald.) DIANULITES APICULATUS (Eichwald). Plate 2, figs. 7, 8; text fig. 219. Millepora apiculata Eichwald, Inter ingrica, 1825, p. 21. Orbitulites apiculatus Eichwald, Zool. spec, vol. 1, 1829, p. 150, pi. 2, fig. 3. Chxtetes apiculatus Eichwald, Lethsea Rossica, vol. 1, 1860, p. 479, pi. 28, figs. 1 a-d. Dianulites apiculatus Dybowski, Die Chaetetid
. Bulletin - United States National Museum. Science. 344 BULLETIN 11, UNITED STATES NATIONAL Fig. 219.—Dianulites apiculatus. a to d, fotje VIEWS OF EICHWALD'S .TYPE OF CHjETETES apiculatus; e, celluliferous surface en- larged. (After Eichwald.) DIANULITES APICULATUS (Eichwald). Plate 2, figs. 7, 8; text fig. 219. Millepora apiculata Eichwald, Inter ingrica, 1825, p. 21. Orbitulites apiculatus Eichwald, Zool. spec, vol. 1, 1829, p. 150, pi. 2, fig. 3. Chxtetes apiculatus Eichwald, Lethsea Rossica, vol. 1, 1860, p. 479, pi. 28, figs. 1 a-d. Dianulites apiculatus Dybowski, Die Chaetetiden der Ostbaltischen Silur-Form., 1877, p. 32, pi. 1, figs. 7, 8. Eichwald's figures and description of Clisetetes apiculatus are of practically no value in distinguishing it from the numerous other massive Russian bryozoans. Dy- bowski's treatment of the species is but little better. My guess regarding the species is that it is founded upon small examples of Dianulites petropolitana, or some other massive bryozoan with the base covered by a layer of the smaller, thick-walled, closely tabulated mesopore-like cells. Occurrence.—Dybowski cites Erras, Duboviki, Pulkowa, and Popowa as localities. dianulites HAYDENH Dybowski. Plate 2, figs. 11-116. Dianulites haydenii Dybowski, Die Chaetetiden der Ostbaltischen Silur-Forma- tion, 1877, p. 37, pi. 1, figs. 11 a-h. Although Dybowski gives a detailed description and figures the internal structure of this species, he shows no characters which enable me to recognize what particular form he had in mind. With- out a restudy of the type-specimens, if they are available, I fear that Dianulites liaydenii can not be recognized. Occurrence.—Middle Ordovician, Wesenberg and Wassalem. DIANULITES SULCATUS Dybowski. Plate 2, figs. 12-126. Dianulites sulcatus Dybowski, Die Chaetetiden der Ostbaltischen Silur-Forma- tion, 1877, p. 38, pi. 1, fig. 12a, 6. The figures of this species are clearly of some Homotrypa or Homo- trypella, but for lack o
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