144 BULLETIN OF THE 



veloped as final products of the same process. From the observations •which 

 were made bearing on this question, it seems probable that the egg in Lizzia is 

 always produced after the budding of the young has ceased. As a preliminary 

 to the whole question, it must first be determined whether Lizzia has a fixed 

 hydroid or not. 



The observation of the egg of Lizzia by Claparede,* who described it as 

 passing through a direct development, should not be dismissed as an error, in 

 the summary way it has been by many naturalists. The egg enclosed in a 

 capsule, which he figures, and which he says develops directly into a me- 

 dusa, was probably the last product of this process of budding, which opened 

 with the production of a jelly-fish by a sexual gemmation. 



The growth of the bud of a young Lizzia from the proboscis of the parent is 

 as follows. 



Plate I. fig. 1 represents a moderately large Lizzia, which, however, is not an 

 adult, where the number of tentacles in radial and iutenuediate clusters is the 

 same. In this figure, on the left-hand side of the upper part of the proboscis 

 an attached medusa bud, considerably developed, can be seen. The shape of the 

 bud is about spherical, and it is united to the proboscis by a short, thick pe- 

 duncle, through which passes a tube forming a free communication between 

 the stomach cavity of the parent and the half-formed proboscis of the young. 

 The surface of the bell, as that of all the other younger buds which are figured, 

 is covered with minute papillae. The contractions and expansions of the bud- 

 ding bell, even while still attached, are quite rapid and violent, causing the 

 animal to sway back and forth as the water emerging from the opening of the 

 bell strikes against the inner walls of the bell caAaty of the parent. The cavity 

 of the bell of the young is relatively much larger than that of the adult. The 

 whole of its apex is taken up by a short pedicle, by which, as has been already 

 pointed out, the bud is fastened to the parent. 



The number of tentacles appended to the bud in this stage of growth is six- 

 teen. The same number is also found in the youngest of the free forms, which 

 had voluntarily separated from the parent, and were fished up with a drag-net. 

 These tentacles are distributed as follows. At the end of each tube there is a 

 cluster of three tentacles, composed of a medial member, usually the longest, 

 and two lateral. A single short tentacle is placed in a position midway on the 

 l>ell rim between each of these clusters. The tentacular bulbs in the bud as 

 compared to the bell are larger in the bud than in the adult. The proboscis 

 has a yellow color, and is, like that of the adult, already four-parted, and when 

 seen from below is cruciJ'orm. The extremities of the oral tentacles are un- 

 divided, but bear many small knobs mounted on short thread-like styles. The 

 proboscis has as yet no peduncle. The stomach and oral tentacles resemble 

 closely the same organs of Dysmorphosa. Three buds on the proboscis of this 

 bud belong to a second generation, grandchildren of the original Lizzia with 

 which our account opened. The second generation of buds has not been found 



• Zeit. f. Wiss. Zool., HJ. X. p. 403. 



