. Bulletins of American paleontology. Ordovician Rugose Corals: Elias 65 which was figured. Twenhofel (1928) listed and figured one specimen as the holotype (GSC 1984), and listed a paratype (GSC 1984;). However, the latter is a thin section of the former. Cox (1937) listed and figured this thin section as the holotype, but it is not the orig- inal of Billings' figure, as he stated. Only one syntype of this species is known (GSC 1984, 1984<;). It is the lectotype of Deiracorallium angulatuni (Billings, 1862). Specimens of Deiracorallium in the Upper Ordovi- cian Stony Mountain Formation of
. Bulletins of American paleontology. Ordovician Rugose Corals: Elias 65 which was figured. Twenhofel (1928) listed and figured one specimen as the holotype (GSC 1984), and listed a paratype (GSC 1984;). However, the latter is a thin section of the former. Cox (1937) listed and figured this thin section as the holotype, but it is not the orig- inal of Billings' figure, as he stated. Only one syntype of this species is known (GSC 1984, 1984<;). It is the lectotype of Deiracorallium angulatuni (Billings, 1862). Specimens of Deiracorallium in the Upper Ordovi- cian Stony Mountain Formation of southern Manitoba were assigned to Streptelasma trilobatiim by Okulitch (1943), to "5. angulatuni" by Nelson (1959b), and to D. manitobense by Nelson (1963, 1981). Similar spec- imens from the correlative Caution Creek and Chasm Creek Formations of northern Manitoba were assigned to D. manitobense and D. manitobense churchillense by Nelson (1963, 1981). These corals from Manitoba may be conspecific with D. angulatuni. a possibility recognized by Nelson (1963, p. 38; 1981, p. 54). All have similar numbers of septa at a particular height (Text-fig. 32). Definite assignment must await further sectioning and study of the forms from Manitoba. Genus GREWINGKIA Dybowski, 1873 1873. Grewingkia Dybowski, p. 384. 1969. Grewingkia Dybowski. B. Neuman, pp. 33-36. 1974. Grewingkia Dybowski. McLean, pp. 42-44. 1981. Grewingkia Dybowski. Nelson, p. 41. 1981. Grewingkia Dybowski. Elias, pp. 11, 12. Type Species (by subsequent designation).—Clisio- phyllum buceros Eichwald (1856, p. 108); selected by Sherzer (1891, p. 284; see Kaljo, 1961, p. 53). Type stratum and locality unknown (see Kaljo, 1961, p. 54). Discussion.—Until B. Neuman's (1969) examina- tion of variability within Grewingkia. diagnoses of the genus were based almost entirely on characteristics of the type species alone. The degree of septal dilation and nature of the axial structure are the most variable morphologic
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