Chap. V. EUDENDRIUM DISPAR. 



287 



become separated {Fir,. 16, a" ;;), the inner one retaining the form of a cone {p), 

 and the hemispherical cavity {ca) thus left is filled by a homogeneous, trans- 

 parent, faint yellow mass. The conical proboscis {p) extends through the whole 

 depth of the cavity {ca), and within is occupied by a prolongation from the 

 chymiferous cavity, which is thickly lined by reddish-brown granules and cells (c). 

 The pedicel (« h) is a little longer than the medusa, and is pervaded by a broad 

 chymiferous cavity, expanding into a still broader chamber (c), the digestive cavity 

 proper of the medusa. Gradually the medusa, at the same time that it increases in 

 size, becomes globular {Fi<j. 17, A), and the disk cavity (m) assumes the form of a 

 spherical chamber, through which the cylindrical proboscis {p) projects, from base 

 to apex. The spermatic contents of the disk cavity {ca), which occupy the whole 

 space about the proboscis, become denser, and more decidedly yellow. Here and 

 there lasso-cells {I) are scattered through the outer wall, and seem to be fully 

 developed; but we have not made any special investigation of their structure. 

 The pedicellar portion {a h c) is about one half longer than the medusa, and the 

 chymiferous cavity {c) has become very irregular in its outlines, on account of 

 the highly increased development of the reddish-brown granules and cells, which 

 line it as well as the proboscis (;^). The two walls, the outer («) and the inner 

 {h), have the same thickness throughout, not only in the pedicel, but in the medusa, 

 where the inner one forms the proboscis {p) and the outer one the disk (A). 

 In the nc.vt stage {Fig. 18) wc find that the pedicellar portion has nearly doubled 

 its length, and that a second medusa (B) has begun to develop immediately 

 below tlie first one (A), simply by a bulging and separation of the outer wall 

 from the inner one (B /). This second medusa is separated from the primary 

 one by a very short neck (>), no longer than the combined thickness of the outer 

 and inner walls {c" e), which, at this point, are closely in contact with each other, 

 the inner one (c') forming a jmrtition, as it were, between the disk cavities 

 (A cu, B ca) of the two medusae. The primary medusa (A) has the form of a 

 flattened sphere, of wliich the proboscis {p) forms the axis, and its spermatic 

 contents {ca) are much denser than in the last phase, and of a dusky yellow 

 color. The spermatic mass of the second medusa (B) is yellowish, like that in 

 the last phase, and occupies a little less than two thirds of the transverse diameter 

 of the disk, the axial portion {p), or, homologically. the proboscis, filling inore than 

 one third of the space. The terminal (t') and basal ends of this proboscidal 

 axis, are expanded, so as to extend a short distance along the internal surface of 

 the outer wall. Immediately below the secondary medusa (B) the pedicel (C) 

 is slightly swollen, and in the act of forming a third medusa, as seen in Fig. 19, 

 in which we have actually a third medusa (C) added to the group, and formed in 

 the same way as the second, but as yet less advanced than the secondary medusa 



