62 THE MEDUSAE. 



tentacles. Unfortunately the stomach is so much damaged that the form of 

 the mouth cannot be determined. There are three otocysts in some, four in 

 other lappets, all of them already connected with otoporpae. 



This is undoubtedly a surface species. The list of captures shows that it 

 is of very general distribution throughout the Eastern Tropical Pacific. 



Cunina peregrina is, as already noted (p. 9), one of the two species in 

 the collection which exhibit stages in a process of internal budding. This 

 process, which was observed in six individuals, none of which had gonads, 

 takes place within the gastric cavity, and is restricted to the oral surface of 

 the gastric lobes. In an individual in which budding is in progress various 

 ridges and thickenings are to be seen in surface views. These swellings 

 vary greatly in form, being either ridges, or more papilliform processes, or 

 even globular eminences (PI. 28, fig. 2). Many of them, moreover, bear 

 secondary prominences, the true buds (PI. 28, fig. 6, b"). In sections (PI. 28, 

 fig. 7) the swellings or stolons, as they may aptly be termed, are seen to be 

 wholly of endodermic nature, the ectoderm, at least as a distinct layer, 

 taking no part in their formation. It is possible, however, though not 

 demonstrated, that amoeboid ectoderm cells may pass through the meso- 

 gloea and wander into them. I have found no evidence that these large 

 swellings ever become detached ; on the contrary, they are apparently noth- 

 ing more than the proliferating regions which give off the true buds. Three 

 successive stages in the formation of buds are represented, from sections, in 

 PI. 28, figs. 5 — 7. The bud, a solid morula-like mass of about twenty- 

 four cells, is constricted off from the stolon, and set free in the gastric cavity, 

 Avhere a considerable number were observed. I can say nothing as to their 

 later history, except that since no stages more advanced in development 

 were discovered, probably they are passed out through the mouth of the 

 parent, to pass through their larval stages either free or as parasites on some 

 other organism. 



■- 



Cunina species? 



Plate 27, Fig. 8 ; Plate 45, Figs. 8-7. 



A Cunina stolon found attached to the subumbrellar surface of a Rhopa- 

 lonema velatum from Station 4640, and several young medusae evidently 

 recently detached from it, may belong to Ounina peregrina. The stolon itself 

 (PI. 45. fig, S), aboul 1.5 nun. m length, bears buds in all stages of develop- 

 iii' 'it- Sin< i ilr e clos< ly resemble the stolon-buds described by many other 



