A FEU" MEDUS.-E NEW TO WOODS HOLL. 



21 



of this medusa to the latter genus. While less marked by asym- 

 metry than is Hybocodon, and while having only one perfectly 

 rudimentary tentacle, these do not seem sufficient grounds upon 

 which to establish a distinct genus. 



Another interesting medusae taken at both these stations and 

 apparently a new species, is closely related to Trachynema 

 digitate, and was at first considered to be the young of this 

 species. A closer examination, however, showed it to be quite 

 specifically distinct. Fig. 7 will afford a good general impres- 

 sion of the morphological aspects of the medusa. In size it 

 averages about five to six mm. in height, by three mm. in width 

 of bell. This of itself might not justify the conclusion of specific 

 distinction, still as an average of about fifty specimens, taken at 

 considerable distances and at an interval of nearly a fortnight, 

 it would strongly warrant such a probability, when we know the 



FIG. 7. 



former species to have an average of from twenty-five to thirty- 

 five mm. in bell height by about half that width. 



Again the color of the former species is quite strongly in con- 

 trast with that of the medusa under consideration. In T. digi- 

 tale the bell is said to be light pink, the manubrium reddish 

 and the tentacles at the contracted tips also red. The present 

 species is wholly devoid of color, except for the slightest tint of 

 pinkish iridescence which at times appears under favorable 

 circumstances. 



Haeckel has placed Agassiz' species under a different family, 

 the Aglauridae, and under the new genus Aglantha. This read- 

 justment is apparently well founded, and I, therefore, incline to 



