BIGELOW: THE CTENOPHORES. 397 



time. It was then preserved in formalin, hut fell into fragments 

 during the journey home. So far as its general anatomy is concerned 

 it agrees very well with a somewhat smaller specimen of veneris from 

 Naples, with which I have compared it. The polar length, in life, 

 was about 45 mm., and the body tapered gradually to the extremities, 

 which were rounded, as in veneris. The only noticeable difference in 

 form is that the oral margin of the band-like body is about as broad as 

 the aboral margin. In veneris it is much narrower, so that a cross- 

 section, taken at either side of the stomach is roughly triangular 

 (Chun, '80, taf. 13, fig. 3). In the present specimen such a cross- 

 section would be roughly rectangular. But in both, the body is 

 broadest along the lines of the subtentacular meridional canal. 



The subgastric ribs closely resemble those of veneris, the paddle- 

 plates being closely crowded and very numerous, and sexual products 

 were visible for the entire length of the subventral meridional canals. 

 I could not determine definitely whether or not there were any paddle- 

 plates in the subtentacular canals, as the critical region was damaged; 

 but there were four agglutinated masses of cilia which lay in positions 

 corresponding to the subtentacular plates of veneris, and they should 

 probably be identified with the latter. The stomach was about 

 32 mm. long, the funnel-canal only about 6 mm.; the proportions 

 between the two thus being about the same as they are in veneris. 

 The junction of adradial with meridional canals could not be traced. 



Tentacles. The tentacles, as in veneris, lack axial filaments, and 

 consist of a large number of filiform tentilla arising from the swollen 

 base. The tentacular sheaths are about one half as long as the polar 

 length. The "Tentakelrinne" bear filamentous tentilla throughout 

 their length. 



The most striking specific character of amphitrites is its color. The 

 tentacle-bases are chrome to amber-yellow; the subtentacular meri- 

 dional canals show as lines of the same color throughout their length; 

 and at each extremity there is a spot of somewhat darker yellow. 

 These spots were common to all the specimens we saw, making them 

 very conspicuous in the water. But though so noticeable, they, and 

 the color-bands along the meridional canals, have disappeared with 

 preservation, the yellow tint of the tentacles alone persisting. 



