146 Papers from the Marine Biological Laboratory at Tortugas. 



veloped. Several stages of budding were noted, but not more than one bud 

 was found to occur at a time. The proliferation of the endoderm cells at 

 a point above the lower set of tentacles was the first sign of budding, and 

 this was soon followed by the protuberance of the ectoderm. The endo- 

 derm cells are small and rich in protoplasm, making a slightly opaque spot 

 in the middle of the developing bud (plate 2, fig. 8). The nine tentacles 

 make their appearance early, and their gradual lengthening, accompanied 

 by internal changes, marks the subsequent growth. There are no points of 

 especial interest in the history of the bud while attached to the parent stalk 

 (see plate 2, figs. 9, 10, and n). The youngest free medusae that were seen 

 bore no sign of their attachment to the hydroid nurse. They were about 

 one-half the adult size, and had only one or two processes on each tentacle. 

 The bell was more tall and slender than in the adult. 



We have, then, the more important stages in the life-cycle of one of the 

 two species of this remarkable genus which occur in the western hemisphere. 

 For efficiency combined with delicacy it would be difficult to imagine a more 

 successful work of nature. 



CAMPANULARIA MACROTHECA, 1 New Species. 

 (Plate 3, figs. 12 and 13.) 



Specific characters. Minute, colorless, unbranched Campanularian 

 hydroid, arising from a single creeping stolon. Stem short. Cup long and 

 slender, vase-shaped, cylindrical, tapering at the point of attachment in a 

 graceful curve. Hydrocaulus with seven rings just above stolon, and just 

 below hydranth a second series of equal number. Margin of cup crenelated 

 in six U-shaped indentations of moderate depth (plate 3, fig. 13). 



Hydranth exceedingly slender, with 16 slender flexible tentacles, length, 

 fully extended, somewhat greater than that of cup. Base of hydranth forms 

 a slender flaring column within the hydrotheca. The manubrium is promi- 

 nent, oval or pear-shaped. The stolon is filamentous, creeping on the stems 

 of algse. The gonotheca is elongate clavate, largest diameter at the free 

 end, which is rounded. The attached end tapers gradually to the colony 

 stem. The gonotheca is about twice as long as the hydrotheca, which it 

 resembles in general shapeliness of outline. The annulations which are a 

 characteristic marking of the stem in the hydranth are lacking in the case 

 of the gonotheca, which is connected with the colony stem by a smoothly 

 tapering branch. In some cases this slender connection was curved around 

 the colony stem very much as some vine-leaves curve about the main stem 

 at the base (see plate 3, fig. 12). 



The blastostyle extends through the gonotheca as a slender column, flar- 

 ing at the base to the wall of the cup, where it rests upon the circular shelf 



1 Derivation : From ^a/cpof, long, and #'//, case. 



