50 



MEDUS/E OF THE WORLD. 



A number of Syncoryne hydroids have been described which probably produce Sarsia 

 medusae, but are not known so to do. Among these may be mentioned Syncoryne crassa 

 Pictet, 1893 (Revue Suisse Zool., tome I, p. 8), a small hydroid only 2 mm. high and rela- 

 tively thicker and shorter than S. pulchella of Allman, 1871 (Monog. Tubularian Hydroids, 

 p. 279, plate 6, fig. 3). Pictet's hydroid comes from Amboina, Malay Archipelago. It has 

 30 to 40 short, knobbed tentacles, and the medusa-buds arise singly between the tentacles. 

 The hydrorhiza is net-like, and the hydroid is pale orange in color. 



Hartlaub, 1907, has made a masterly study of the genus Sarsia, and shows that the 

 species fall conveniently into two groups: the Eximia group, with short manubrium occupied 

 entirely by the gonad, which extends from its base to near the mouth, and the Tubulosa group, 



Tabular Description of the Medusa of Sarsia. Continued. 



