ANTHOMEDUS.E SARSIA. 



63 



This successive freeing of the three series of buds produces various appearances at different 

 periods of time, and in this manner we may explain the condition observed by Haeckel, 1879, 

 in Sarsia " siphonop/iora," where the buds appeared in two series, the oldest and largest of 

 the upper series being at about the middle ot the manubnum, while the oldest ot the lower 

 series was near the base of the stomach. Forbes, 1848 ( plate 7, fig. 2 e), shows an intermediate 

 stage in the budding process, and an early stage is shown by Chun, 1895 (fig. 25 A). The 

 law of succession in development of the medusa-buds is clearly demonstrated by Chun. 



Both ectoderm and entoderm of the 

 manubrium take an equal share in the 

 formation of the budding medusae. 



For details of the character of the 

 medusa, see tabular description of the 

 medusae of Sarsia. 



Haeckel failed to observe the sec- 

 ondary and tertiary medusa-buds upon 

 the pedicels of the budding medusae in 

 his Sarsia siplionophora, but this is 

 probably due to an oversight, tor in all 

 other respects his medusa appears to be 

 identical with S. gemmiftra P'orbes. 



The gonad develops at the distal 

 end of the manubrium after the budding 

 process has ceased. Possibly there may 

 be 2 or more ring-like gonads ? (See 

 Hartlaub, 1907.) If this be the case 

 the medusa may be identical with 

 Dipuretia fertilis Metschnikoff, 1871. 



Sarsia hargitti. 



Corynt producta, HARGITT, 1902, American Natural- 

 ist, vol. 36, p. 550, fig. 3. 



Syncorynf produtla, HAROITT, 1904, Bulletin Bureau 

 of Fisheries U. S., vol. 24, p. 30, plate I, fig. I. 



A medusa called Sarsia producta is 

 produced by budding from the hydroid 

 of StauriJia producta Wright; and as 

 this name takes precedence over that 

 of Hargitt's medusa, it is necessary to 

 rename the American species. 



Bell i .5 mm. high, and I mm. wide. 

 Apex dome-like and rounded, and sides 

 slightly compressed. Bell-cavity only 

 about half as deep as the height of the 

 bell. There are 4 long, equally devel- 

 oped tentacles with large basal bulbs, 

 each with a large, ectodermal ocellus. 

 Velum well developed. The 4 radial- 

 canals are narrow, straight, and smooth- 

 edged. The manubrium projects far 

 beyond the veJar opening, but is cap- 

 able of great contraction. Its terminal 

 part is bulb-like, while the basal portion is spindle-shaped and bears a whorl of medusi- 

 1'orin gonads. The stomach gives rise to a blunt, dome-shaped aboral projection. The 

 mouth is a simple, round opening. The basal part of the manubrium is orange, and its 

 free end blue-green. The tentacle-bulbs are orange, edged with delicate green. The ocelli 

 are black. A single specimen was found by Hargitt at Woods Hole, Massachusetts, on August 



FIG. 25. Sariia gcmmifera, showing law of building. After Chun, in 



Bibliotheca Zoologica, Heft 19, taf. I, 1895. 

 A, early; B, later stages of the process of budding. 



