ulrich-bassler] revision of paleozoic bryozoa 



271 



Occurrence. — Lower shales of Hamilton formation at Thedford, 

 Ontario. 



Cat. No. 43,120, U. S. N. M. 



RHOPALONARIA CAPILLARIS (DoUfus) 



(Text figure 2i") 

 Terebripora capillaris Dollfus, Bull. Soc. Linn. Normand. (3), i, 1877, 



p. 96, pi. I, figs. 2-4. 

 Terebripora capillaris Oehlert, Bull. Soc. d'Etud. Sci. d'Angers, xvii, 

 1888, p. 107. 

 Judging from Dollfus' figure, a reduced copy of which is here 

 reproduced as text figure 32, this 

 species appears to be closely allied to 

 our Rhopalonaria rohusta, although 

 in some respects it approaches the 

 genotype R. venosa. Although agree- 

 ing with the former in s,\ze,R. capillaris 

 is distinguished by the elongate ellipti- 

 cal rather than fusiform shape of its 

 cells and by its proportionately much 

 longer and more sharply defined con- 

 necting stolons. The greater regu- 

 larity and more robust growth of R. 

 capillaris will distinguish it from R. 

 venosa. 



Occurrence. — Devonian of France 



Fig. 32. — Rhopalonaria capillaris 

 (Dollfus). X 9. Devonian of France. 



RHOPALONARIA? VETUSTA (Oehlert) 



(Text figure 32) 



Terebripora vetusta Oehlert, Bull. Soc. d'Etud. Sci. d'Angers, xvii, 1888, 

 p. 108, pi. X, fig. 3. 



Oehlert's illustration, of which text figure 33 

 is a reduced tracing, shows that this species does 

 not conform strictly with Rhopalonaria, but that 

 it is doubtless more closely related to this genus 

 than to Terebripora. . The differences from the 

 typical forms of Rhopalonaria are particularly 

 the arrangement of the cells and stolons and the 

 short subangular form of the impressions of the 

 cells. It is possible that the portion of the 

 zoarium figured by Oehlert may represent a part 

 where buds from neighboring branches, by 

 growth over each other, obscured the regular development. The 



Fig. 33. — Rhopal- 

 onaria ? vetusta 

 (Oehlert). X 9. De- 

 vonian of France. 



