50 



TRACHYNEMA CAMTSCHATICUM. 



jictinal pole in the ordinary state of expansion (Figs. 76, 79) ; it is only 

 slightly contractile, and terminates in four stout lappets. (Fig. 80.) 

 The outline of the abactinal portion of the spherosome is conical, with 

 two very slight cvu'ves, one immediately above the point where the 



Fig. 7t). 



Fig. 78. 



Fig. 80. 



chymiforous tubes turn towards the actinal pole, along the solid pro- 

 loniJ-ation of the spheromere, and the other nearer the abactinal pole. 

 The outlme of the spherosome bends very suddenly towards the al)ac- 

 tinal pole immediately above the point of attachment of the ovaries, 

 somewhat as we have it in younger specimens of Trachy- 

 nema. The number of spheromeres is eight, and that of 

 the oral appendages four. The ambulacral tentacles (40 

 to 48) are rather contractile, and when contracted apjjear 

 as if they had been knotted. The general color is very 

 pale pink ; the ovaries, ambulacral tentacles, and the pro- 

 boscis being of a lightrbrowTi color. Although generally 

 this medusa moves very slowly, when disturbed its movements are very 

 rapid; and instead of continuing in the same direction, the animal draws 

 all its tentacles inside of the actinal veil, and then suddenly throws them 

 out again, this contraction turning the medusa almost upside down, and 

 starts off in nearly the opposite direction from that which it had previ- 

 ously? pursued. This species was only seen during a short time in July. 

 The drawing of Brandt seems to have misled Forbes ; he speaks of 

 the want of ocelli of the British species as distinguishing it from the 

 C. camtschatlca ; what Forbes has taken for oceUi are only sections of 

 the chymiferous tubes leading into the peripheric tube. 



Kamtschatka (Mertens) ; Galiano Island, Gulf of Georgia, W. T. 

 (Alex. Agassiz). 



Cat. No. 282, Gulf of Georgia, W. T., 1859, A. Agassiz. 



Fig. 76. Profile view of Trachynema camtsehaticum. slightly magnified. 



Fig. (7. One of the genital organs, t], point of attaelnnent to ehymiforons tulie. 



Fig. 78. Section of Trachynema to show the size of tlie gelatinous prolongation, p, and the 

 mode of attachment of the genital organs, g. 



Fig. 70. Chymiferous cavity of Trachynema at the end of the gelatinons proboscis. 



Fig. 80. View of Trachynema from above, to show the shape of the lips of the actinostome. 

 r, cliymiferons cavitv at base of proboscis into which the tubes lead ; p. gelatinous part of Jiro- 

 boscis ; I, lips of actinostome ; o, opening fornieil by contraction of part of the chymiferous cavity. 



