582 THE AUSTRALIAN HYDROMEDUS.E, 



I. SUB-FAMILY. CODONIN^E. 



CODONIDJE. Haeckel. 



Mouth simple, with flaps or barbels. Gonad simple tube 

 shaped, not divided radially, with four simple Radial Canals and 

 unbranched tentacles. Alimentary Zooids, with tentacles, which 

 are scattered, or in two verticils. 



33. GENUS SARSIA. Lesson. 



Codonidae with four perradial tentacles of equal size. Manubrium 

 often very long, never cubic, surrounded by a single large Gonade 

 which has the shape of a tube. Umbrella without cap on the 

 vortex. Exumbrella smooth, without projecting nettle warts. 



The Medusa? bud on Polyp colonies the members of which are 

 nearly alike, club or spindle-shaped with scattered capitate ten- 

 tacles. The Perisarc does not extend to form cups for the Polyps. 

 The structure both of the Medusa and the Polyp has been studied 

 by F. E. Schulze. (1) 



The Medusa possesses mesenterial pouches in the Umbrella, so 

 that a coelom is formed. The Polyps bear on their tentacles 

 Palpocils, long bristles, discovered and named by P. Wright (2), 

 which are considered by Schulze to be oi^gans in connection with 

 the sense of touch. These peculiarities of Sarsia tubulosa, the 

 species studied by F. E. Schulze, are also met with in the Austra. 

 lian species. Allman (3) figures and describes the species of the 

 Polyps. Weismann (4) endorses the statements of F. E. Schulze. 



(1) F.E. Schulze. Ueber den Bau von Syncoryne Sarsii Loven und die 

 zugehorige Meduse Sarsia tubulosa. Lesson, Leipzig, 1873, 



(2) Perciv 1 1 Wright. Proceedings of the Royal Physical Society of Edin- 

 burgh. Vol. I., p. 341. 



(3) J. Allman. A Monograph of the Tubnlarian, etc. Hydroids, Vol. 

 II., p. 274 ff. 



(4) A Weismann. Die Eutstehung der Geschlechtszellen bei den Hydro- 

 medusen. Seite 56. 



