g4 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 8t 



Occurrence.— JJ-ppeT Devonian (Tully limestone-West Brook mem- 

 ber): 2}^ miles south of Sherburne, N. Y. 

 Holotype.—U.S.l<iM. No. 87894. 



Genus HERNODIA Hall, 1881 



Hernodia Hall, Trans. Albany Inst., vol. 10, p. 196, 1883 (abstract, p. 196, 1881); 

 Rep. State Geol. New York, 1883, p. 58, 1884 — Hall and Simpson, Pal. New 

 York, vol. 6. p. 26, 1887.— Miller, North Amer. Geol, Pal., p. 309, 1889.— 

 Simpson, 14th Ann. Rep. State Geol. New York, 1894, p. 596, 1897.— Nick- 

 LES and Bassler, U. S. Geol. Surv. Bull. 173, p. 21, 1900. 



Nicholsonia Davis (part), Kentucky Foss. Corals, pt. 2, 1885 (name proposed but 

 not defined). [Genotype: A^. canadensis Davis (not Nicholson) = //ernodta 

 davisi and Hederella contortilis, new species.] 



This genus may be distinguished from Hederella by its elongate, 

 club-shaped, annulated zooecia budding regularly from the middle of 

 the lateral wall of the preceding zooecia, each in this manner giving 

 rise to one or more daughter cells. At intervals rather constant for the 

 species a bud inaugurates a new branch as in Hederella, and this in turn 

 divides still further. Thus Hernodia may be considered as a Hederella 

 with clavate zooecia arising from the middle portion of the preceding 

 one. Besides the following species, Hernodia includes H. poctai 

 Prantl, 1938, and H. perminuta Prantl, 1938, from the Silurian and 

 Devonian, respectively, of Bohemia. 



HERNODIA HUMIFUSA Hall, 1881 



Plate 15, Figures 5, 6 



Hernodia humifusa Hall, Trans. Albany Inst., vol. 10, p. 196, 1883 (abstract, 

 p. 196, 1881); Rep. State Geol. New York 1883, p. 58, 1884.— Hall and 

 Simpson. Pal. New York, vol. 6, p. 281, pi. 65, figs. 20, 21, 1887.— Simpson, 

 14th Rep. State Geol. New York, 1894, pi. 25. figs. 1, 2, 1897.— Grabatt and 

 Shimer, North Amer. Index Foss., p. 120, 1907.— Bassler, in Cleland, 

 Wisconsin Geol. Nat. Hist. Surv., Bull. 21, sci. ser. 6, p. 58, pi. 6, figs. 9. 10. 



1911. '^ f 6 > , 



This, the genotype, is a robust, well-marked species, with zooecia 5 

 to 6 umi. in length, giving rise regularly toward the middle of each 

 side at an angle of 45° to buds 0.25 mm. in diameter at theu- base, 

 expandmg gradually to the full width of the tube, 1 mm. Branching 

 occurs rather regularly at distances sometimes of 15 mm. and at 

 angles of 45° or less, so that the entire zoarium presents a graceful 

 aspect. 



Occurrence.-Uiddle Devonian: Cazenovia, etc. (LudlowvUle shale), 

 JN. Y.; Milwaukee, Wis. (Milwaukee limestone). 

 Plesiotype.—V.S.NM. Nos. 87885, 94623. 



