ANTHOMKDUS.E SARSIA. 



65 



Sarsia (Stauridiosarsia) producta. 



A^on Stauridir, DUJARDIN, 1843, Ann. Sci. Xaturelles, scr. 2, torn. 20, p. 370. 



Stauridia producta, WRIGHT, 1858, Edinburgh New Philos. Journ., ser. 2, p. 283, plate 7, figs. 6-8. 



Stauridium productum, HINCKS, 1868, British Hydroid Zoophytes, p. 68, plate 12, figs, i, I a. HARTLAUB, 1895, Zcit. fur 



wissen. Zool., Bd. 61, p. 142, taf. 7, figs. 1-19; taf. 8, figs. 1-4; taf. 9, figs. I, 2, 6; 1907, Nordisches Plankton, Mr. 



12, p. 53, figs. 47-50. 



The medusa is a Sarsia, but the hydroid is similar to Stauridia, and differs from Syn- 

 corync, the hydroid of Sarsia, in that there is a basal circlet of simple, knobless tentacles; 

 whereas all of the tentacles of Syncoryne terminate in knobs. The tentacles of Stauridia 



28. 



FIG. 28. Sarsia producta, after Hartlaub, in Nnrdisches Planktn. 



FIG. 29. Medusa; of "Sarsia producla," natural size; after Hartlaub, in \ordischt-s Plankton. 



FIG. 30. "Stauridium productum," after Hincks, in British Hydroid Zoophyte-;. Hydroid and young medusa. 



are of two sorts the simple, short, stiff, tapering, knobless basal circlet, and above them 

 several circlets of knobbed tentacles which arise from the sides ot the hydranth. In Syncoryne, 

 on the other hand, we find only knobbed tentacles. Thus two distinct genera of hydroids 

 produce one and the same genus of medusa. Moreover, Dujardin, 1843, discovered that the 

 hydroid which he called "StauriJie" produces the medusa Cladonema rnJititutu. 



As the name Stauridia is preoccupied by Dujardin to designate the hydroid of Cladonema 

 it can not be applied to the medusa of Stauridia producta. I therefore call the medusa of 

 Stauridia producta by the name Sarsia producta, thus indicating its relationships when in 

 the reproductive stage. 



The medusa Sarsia producta, which is produced by the hydroid Stauridia producta, may 

 be described as follows: 



Bell 10 mm. high, 7 mm. wide, three-fourths-egg-shaped, with thick, gelatinous walls. 

 4 equally developed, radially placed tentacles; 1.5 times as long as the bell-height. Tentacle- 



