Medusce and Ctenophora 9h 



There are no ocelli, or even any visible pigment granules, on the bases of 

 either class of tentacles. 



In the type specimen the manubrium (PI. I. fig 4) is almost two-thirds 

 as long as the bell cavity is deep, flask shaped, with a simple quadrate lip, in 

 the contracted state tightly closed, its margin smooth, without nematocyst 

 knobs or swellings. 



Gonads: The arrangement of the genital swellings is always an important 

 character in this family; but in the present case it is impossible to determine 

 how much they owe to contraction, and in the type (apparently sexually mature) 

 the genital products apparently occupy the whole interradial walls of the manu- 

 brium, except for its labial portion (there are no " mesenteries," the manubrium 

 being quite separate from the subumbrella except at its narrow base), just as is 

 the case in Heterotiara. Along the four perradii (as revealed by the four corners 

 of the quadrate lip and the four primary radial canals), there is a narrow band 

 free from sexual products. In each of the interradii there is a double series of 

 2-4 oblique folds, better seen in the figure than described: a very simple type 

 of gonad. But, as noted above, it is a question how far even these folds owe 

 their existence to contraction. In the other specimen, a female with large 

 eggs visible, the manubrium is even more contracted, so much so that it is thrown 

 into a series of irregular folds, and it is impossible to reconstruct its appearance 

 in life. 



Colour: In the preserved state both specimens are colourless except for 

 the manubrium, which, as is often the case, is pale opaque ochre yellow, a tint 

 which very probably is no index to its colour in life, but merely the result of 

 preservation. 



This new genus agrees so well with the Bythotiaridse in the structure of 

 its primary tentacles, and their relation to the bell margin, in its manubrium, 

 and in the departure of its canals from the fundamental Anthomedusan number, 

 that I have no hesitation in referring it to that family, though in the presence 

 of two series of tentacles differing structurally as well as in size, it recalls several 

 typical Pandeids, e.g., Halitiara formosa (Fewkes, 1882, p. 276, Mayer, 1910, 

 p. 107, pi. 13, fig. 1), Dissonema turrida (1909a, p. 200), Dissonema gaussi 

 (Vanhoffen 1912, p. 361, PI. I, fig. 2), and Cirrhitiara superba (Mayer, 1910, 

 p. 126, PI. 28, fig. 3; Hartlaub, 1913, p. 284, fig. 237). But it is sufficiently 

 distinguished from all Bythotiarids yet known by the presence of eight un 

 branched canals. 



Trachomedus.(E. 



Family Olindiidae Brown?. 



(?) Eperetmus typus Bigelow. 



Eperetmus typus Bigelow, 1916, p. 401, pi. 59, figs. 1-8. 



Station 20g, Port Clarence, Alaska, August 4, 1913, two specimens, about 

 9 and 7 mm. in diameter, both in poor condition. 



These two specimens are only provisionally referred to this species, their 

 poor condition precluding absolute identification. 



In the general appearance of the saucer-shaped bell, with rather long manu- 

 brium hanging about to the level of the bell opening, they almost exactly re- 

 produce the type specimen of this species (1915, pi. 59, fig. 1). And while the 

 sinall exumbral papillae of the latter are not to be seen here, their apparent 

 absence may well be due to the fact that they are, apparently, more or less 

 macerated. The margin of the lip, too, is studded with small sessile nematocyst 

 knobs, exactly as I have figured it for Eperetmus (1915, pi. 59, fig. 5), especially 

 evident in the larger specimen, in which the mouth is widely open; and the 

 gonads, from their large size apparently fully developed in the large specimen. 



