1903.] MEDUSA FROM BRITISH COLUMBIA AND ALASKA. 165 



Tihrris brevicoiiis, sp. nov. 

 HippoGrene ^mertensi, 

 Thauinantias cellularia. 

 Polyorchis iiiimota, sp. nov. 

 Proboscidactyla hrevicirrata. 

 rhicdidimn langiddmn. 



,, gregarium. 



Mesonema victoria, sp. nov. 

 Cronionemus vertens. 



,, agassizii, sp. nov. 



Muggicea kochii. 



A. ANTHOMEDUS^. 



I. CoDONiD^ Haeckel 



OoDONiuM Haeckel (18, p. 13). 



1. OoDONiUM APicuLUM, sp. nov. (Plate XYII. fiff. 1 and 

 Plate XXII. figs. 4 & 5.) ^ ^ ^- ^ 



Specific description.— ThQ bell is nearly one-half taller than it 

 is broad (1-5 cm. by 1 cm.). In some individuals the difference 

 between height and breadth is not so marked. The diameter at 

 the velum is somewhat less than it is nearer the apex. The apical 

 process on the external surface is small and not abruptly set off. 

 The apical canal (Stielcanal) is likewise short but always present" 

 The velum is well developed. 



_ The four tentacles are rather stout, and in the contracted con- 

 dition are two-thii^ds to one and a half times the diameter of the 

 bell in length. They are attached to the beU-margin by large 

 prominent tentacle-bulbs, brownish in colour, having each a 

 distinct black ocellus. On either side of each tentacle-bulb is a 

 large nematocyst-pad (c/. Gronberg, 17). 



The stomach passes without distinction into the proboscis, 

 which is cylindrical and contracted into circular ridges. The thin 

 membranous end bears the small circular mouth, which is not 

 lobed. The stomach is very distensible, being filled in most of 

 our specimens with a mass of small Copepods. Often it is only 

 the upper end, near the attachment to the bell, that is so 

 distended ; when this is the case the lower end is usually con- 

 tracted and collapsed, as shown partially in PI. XVII. fig. 1. The 

 proboscis seems seldom to be extended beyond the velum, although, 

 if required, it can be protruded a distance of over a centimetre. 



The radial canals are very slender, and terminate in circular 

 openings in _ the upper end of the narrow stomach. Above the 

 point of their entrance into the stomach is the apical canal. In 

 the circular folds of the stomach are masses that look like gonads ; 

 the preservation, however, was not sufficiently good enough to 



