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Show MEDUSAE FROM BRITISH COLUMBIA AND ALASKA. 165 Turris breviconis, sp. nov. Hippocrene mertensi. Thaumantias cellidaria. Polyorchis minuta, sp. nov. Proboscidactyla brevicirrata. Phialidium languidum. „ gregarium. Mesonema victoria, sp. nov. Gonionemus verlens. „ agassizii, sp. nov. Muggicea kochii. A. AXTHOMEDUS^E. I. CoDONiDiE Haeckel CODONIUM Haeckel (18, p. 13). 1. CODONIUM APICULUM, sp. nov. (Plate XVII. fig. 1 and Plate XXII. figs. 4 & 5.) Specific description.--The 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 condition are two-thirds to one and a half times the diameter of the bell in length. They are attached to the bell-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 {cf. Grbnberg, 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 contracted 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 1903.] |