. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A FEU" 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 disti
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A FEU" 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
