TUBICOLAR ANNELIDA. 17 



The following forms are here regarded as representing various stages of 

 development of what appears to be a single species of the genus CORNULITES. 

 The figures to which names are here applied are those most nearly resembling 

 the illustrations of the several species as given by the authors, and not as 

 determined by the writer. 



SP1R0RBIS, Lamarck. IS01. 



Spirorhis Cincinnatensis. 



PLATE CXV, FIGS. 1,2. 



tSpirorbis Cincinnatensis, Miller and Dyer. Jour. ('in. Soc. Nat. Hist., vol. i, p. 38, pi. i, fig. 13. l*7s. 

 Hudson River group. Cincinnati, Ohio. 



ORTONIA, Nicholson. is7l». 

 Ortonia ?ninor. 



PLATE CXV, FIG 3; AND PLATE ex VI a FIGS. 19,20. 

 Ortonia minor, Nicholson. Geological Magazine, vol. \. p. 56, pi. iv, fig. 2a. 1ST:;. 



Hudson River group. Cincinnati, Ohio. 



Ortonia conica. 



PLATE CXV, FIG. J7 ; AND PLATE CXV1 v. FIGS. 15, 16. 

 Ortonia conica, Nicholson. Geological Magazine, vol. ix. p. 447, fig. 1. 1S7'J. 



Hudson River group. Cincinnati, Ohio. 



CONCHICOLITES, Nicholson. 1872. 

 Conchicolites corrugatus. 



PLATE CXV, FIG. 27 ; and PLATE CXVI a, FIGS. 17, 18. 

 Conchicolites corrugatus, Nicholson. Geological Magazine, vol. x, p. OS, pi. iv. lif,'. :i. I S73. 



Hudson River group. Cincinnati, Ohio. 



T E NT ACULITES, Schlothkim. Isl'o. 



Tentaculites Sterlingensis. 



PLATE CXV, FIGS. 5-7, 32. 

 Tentaculites Sterlingenns, Meek and Worthkn. Proe. A.cad. Nat. Sci., p. 255. 1865. 



Hudson River group. Cincinnati, Ohio. 



