REPORT ON THE SIPHONOPHOR^E. 115 



which the two phyllocyst-cauals shine. This facet is nearly rectangular, its horizontal 

 inferior edge somewhat longer than the parallel superior, and three times as long as the 

 two short lateral edges which diverge downwards. 



The bract of the young Eudoxomes, sessile on the stem (fig. 13), exhibits the 

 characteristic form of the adult to a much less degree, and has a more irregular cuboidal 

 form. The bract of the young, just detached Eudoxia (figured in fig. 12, b), forms the 

 transition from the latter to the former. 



Bracteal Cavity (figs. 12, 18, bh). — The subumbrellar cavity of the hydrophyllium is 

 deeply campanulate or nearly conical, somewhat compressed from both lateral sides. Its 

 posterior or dorsal wall is nearly vertical and touches the siphon and the tentacle. Its 

 anterior half is filled up by one or more gonophores. The inferior and anterior trape- 

 zoidal opening of the cavity has been already described. 



Phyllocyst (figs. 12-18, be). — The canal system of the bract is composed of a very large 

 dorsal sac-shaped phyllocyst, which stands vertically, and of two slender horizontal canals, 

 which arise from the apex of the former and diverge laterally. The large phyllocyst 

 occupies nearly the dorsal half of the bract, and is a vertical cylinder with rounded basal 

 faces, or nearly ellipsoidal, three times as long as broad. Its small internal cavity is 

 surrounded and almost filled with very large vacuolate entoderm-cells. 



The two paired lateral canals of the bract (figs. 12-18, ex right, cl left), which arise 

 from the apex of the phyllocyst at right angles, are slender and run divergently towards 

 the two frontal corners of the bract, in their first half horizontally, in the second curved 

 upwards. Their blind distal ends (at the junction of the apical, ventral, and lateral 

 faces) are somewhat club-shaped. 



Siphon (figs. 12, 13, 21, s). — The polypite is hidden in the dorsal part of the bracteal 

 cavity, and exhibits the usual structure of the Calyconectae — a short pedicle, a thick- 

 walled basigaster, a wide stomach with hepatic stripes, and a proboscis with a four- or 

 eight-lobed mouth. 



Tentacle (figs. 12, 13, t, 26). — The single tentacle, which arises from the pedicle of 

 the siphon, exhibits the same structure as that of other Abylidse. Each tentillum 

 bears on its pedicle (fig. 26, ts) a slender reniform cnidosac, and in the proximal part of 

 this six to eight large spindle-shaped cnidocysts at each side of the cnido-battery (kg). 

 The terminal filament (tf) is slender and long. 



Gonophores (figs. 22-25, isolated; figs. 12-19, included in the cavity of the bract). — 

 Each ripe Eudoxia usually bears a pair of gonophores in the ventral part of its cavity, 

 before the siphon. The two gonophores, right and left, are so transformed by mutual 

 pressure that their umbrella or gonocalyx (originally a tetragonal prism) assumes an 

 asymmetrical pentagonal form. The inner or medial faces (in which the two neigh- 

 bouring gonophores meet in the sagittal plane of the bract) arc flattened, whilst the outer 

 or lateral faces are prominent above, in form of a lateral horn. One of the five edges 



