TUBICOLAR ANNELIDA. 9 



1868. Meek and Worthen, Tentaculites. Geol. Survey of Illinois. Geol. 



and Pal., vol. iii. 

 1872. Nicholson, On the genera Cornulites and Tentaculites, and on a new genus 



Conchicolites. Am. Jour. Sci., Third Scries, vol. iii, p. 202. 



1872. Nicholson, On Ortonia, a new genus of Tubicolar Annelides, with Notes on 



the genus Tentaculites. Geol. Mag., vol. ix, p. 446. 



1873. Nicholson, Description of two new species of Annelides, Conchicolites and 



Ortonia. Geol. Mag., vol. x, p. 54, pi. iv. 



1874. Nicholson, Ortonia intermedia. Geol. Mag., New Series, vol. i. 

 1874. S. A. Miller, Tentaculites. Cin. Quart Jour. Sci. 



1878. S. A. Miller and C. B. Dyer, Spirorbis. Jour. Cin. Soc. Nat. 



Hist. 



1879. Hall, Spirorbis [?]. Twenty-eighth Rept. N. Y. State Mus. Nat. Hist. 

 1879. Hall, Cornulites (Annelides). Twenty-eighth Rept, N. Y. State Mus. 



Nat. Hist. 

 1884. Ringueberg, Cornulites. Proc. Acad. Nat. Sci. Phila. 



In the study and description of the species illustrated in the Paleontology 

 of New York, Vol. V, pt. ii, under the generic names of Tentaculites, Styliola, 

 Coleoprion, Coleolus, Hyolithes, etc., there appeared little difficulty in recog- 

 nizing their relations to each other and their nearest affinities as with the 

 Pteropoda. The only question arose in considering certain species, which had 

 originally been referred to the genus Tentaculites, and of which, in the begin- 

 ning, I had no knowledge from the actual examination of specimens. 



In the tabular arrangement of the American species of this genus (p. 162, loc. 

 cit.) I admitted into the list five forms which had been described as Tentaculites, 

 from the Hudson River horizon (Cincinnati group). Even before the pages had 

 gone to press I began to doubt the generic identity of these forms with true Ten- 

 taculites, and an examination of the species from the neighborhood of Cincinnati, 

 brought confirmatory evidence of my suspicion as to their true affinities. At a 

 later date, through the kindness of Mr. S. A. Miller and the late Mr. C. B. Dyer, 

 I was enabled to study a collection of specimens which seemed to present a pretty 

 complete life-history of those forms described as Tentaculites from the Cincin- 

 nati region. 



