. Bulletin - United States National Museum. Science. 306 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. DITTOPORA COLLICULATA (Eichwald). Plate 3, figs. l-4c, 6; plate 11, figs. 7-15; text figs. 188-190. Trematopora colliculata Eichwald, Bull. Soc. Nat. Moscou, No. 1, 1856, p. 96.— Schmidt, Archiv. fur d. Nat. Liv-, Ehst- und Kurlands, vol. 2, ser. 1, 1858, p. 228.—Eichwald, Lethsea Rossica, vol. 1, sect. 1, 1860, p. 494, pi. 27, figs. 14a_c.—Dybowski, Die Chaetetiden der Ostbaltischen Silur-Formation, 1877, p. 72, pi. 2, figs. 4-4c.—Nicholson, The Genus Monticulipora, 1881, p. 233, fig. 48. Trem
. Bulletin - United States National Museum. Science. 306 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. DITTOPORA COLLICULATA (Eichwald). Plate 3, figs. l-4c, 6; plate 11, figs. 7-15; text figs. 188-190. Trematopora colliculata Eichwald, Bull. Soc. Nat. Moscou, No. 1, 1856, p. 96.— Schmidt, Archiv. fur d. Nat. Liv-, Ehst- und Kurlands, vol. 2, ser. 1, 1858, p. 228.—Eichwald, Lethsea Rossica, vol. 1, sect. 1, 1860, p. 494, pi. 27, figs. 14a_c.—Dybowski, Die Chaetetiden der Ostbaltischen Silur-Formation, 1877, p. 72, pi. 2, figs. 4-4c.—Nicholson, The Genus Monticulipora, 1881, p. 233, fig. 48. Trematopora cingulata Dybowski, Die Chaetetiden der Ostbaltischen Silur- Formation, 1877, p. 78, pi. 2, figs. 1, 16. Trematopora cingulata var. nodosa Dybowski, Die Chaetetiden der Ostbaltischen Silur-Formation, 1877, p. 80, pi. 2, fig. la. Trematopora variabilis Dybowski, Die Chaetetiden der Ostbaltischen Silur- Formation, 1877, p. 81, pi. 2, figs. 2, 2a. Trematopora variabilis var. complanata Dybowski, Die Chaetetiden der Ost- baltischen Silur-Formation, 1877, p. 83, pi. 2, figs. 3, 3a. Trematopora pustulifera Dybowski, Die Chaetetiden der Ostbaltischen Silur- Formation, 1877, p. 80, pi. 2, fig. 6. Dybowski has given a lengthy, detailed description of Eichwald's Trematopora colliculata, and more or less extended descriptions of the species and varieties listed above as synonyms. On account of the marked external peculiarities, elongate-oval zooecia with closed interzooecial spaces, Eichwald's illustrations (fig. 188) are sufficient for the identification of his species; moreover, Dybowski has figured the internal structure fairly well (see pi. 3, figs. 4-4 &). I have examined over 400 specimens with this same internal struc- ture. Of these a small percentage have their maculae raised into rounded monticules, as figured by Eichwald, a large number have their monticules trans- versely elongated, while, finally, in the largest number of specimens the maculae are not rais
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