CHAPTER SECOND. 



THE GENERA CLAVA AND RHIZOGETON, 



SECTION I. 



THE ADULT HYDROID OF CLAVA LEPTOSTYLA AG. 



Along our shores, at low tide, one may frequently observe upon our common 

 sea-weed, Fucus vesiculosus, little, red, moss-like bunches, which wave to and fro with 

 the surges of the ocean. These bunches are, almost invariably, colonies of Clava 

 leptostyla (PI. XXI. F/g. 1)} The haunts of Coryne, Hydractinia, Tubularia, Tham- 



^ References to the genus Clava Gmel. 

 Clava, Gmelin, in Linn. Syst. Nat, XIIL, 1788, 

 Vol. VI. p. 3131. 

 " Johnston, Brit. Zobph., 2d ed., 1847, p. 29, 



PI. I. Figs. 1-3. 

 " Leidy, Marine Invert., Journ. Acad. Nat. Sc, 

 Philadelphia, 1855, Vol. III. PI. XI. 

 Figs. 33 and 34. 

 « Wright, Edinb. New Phil. Jour., 1857, Vol. 



VI. p. 79, PI. II. Figs. 1-6. 



" Wright, Edinb. New Phil. Jour., 1858, Vol. 



VII. p. 296. 



Coryne, ? Pallas, .Spic. Zool., 1774, p. 41, PI. IV. 



Fig. 9, D rf E. 

 « Lamarck, Syst. Ans. Vert., 1801, p. 364. 

 " Oken, Lehrbuch der Naturg., 1815, p. 50, 



PI. I. 4, Zunft, 3. 

 " Lamarck, An. sans Vert., 1816, Vol. II. 



p. 61. 

 " Fleming, Brit. Animals, 1828, p. 553. 



Coryne, Bosc, Hist. Vers., 2de ed., 1830, p. 279, 



PL XIV. Fig. 7. 

 " Ehrenberg, Corrallenthiere, Acad. Wissen- 



schaft., Berlin, 1834. 

 " Oken, Allgemeine Naturg., 1835, Bd. 5, 



p. 73. 

 " Lamarck, An. sans Vert., 2de ed., 1836, 



Vol. n. p. 72. 

 " Johnston, Brit. Zoiiph., 1st ed., 1838, p. 109, 



PI. IL Figs. 1, 2, and 3. 

 *' Van Beneden, Rech. Embr. Tubulaires, 



Nouv. Mem. Acad., Bruxelles, 1844, Vol. 



XVII. p. 60, PL V. 

 " Steenstrup, Untersuch. liber Hermaphro- 



ditismus ; aus dem Diinischen, MSS., 



iibersetzt., 1846, p. 66, PL L Figs. 17-21. 

 Hydra, Forskal, Icones Rerum Nat., 1776, PL 



XXVI. Fig. B, b. 

 « MUller, Zool. Danica, 1788, Vol. L p. 3, 



PL IV. 



