. The Biological bulletin. Biology; Zoology; Marine biology. io6 CHAS. W. HARGITT. when the stem finally contracts in a way to suggest that of Vorti- cella, though without the coiling of the stem as in the latter organism. I am inclined to regard the organ as probably pos- sessed of a tactile function. Ectopleura. — While dredging off Gay Head on board the "Fish Hawk," July 15, 1907, I was fortunate in discovering on the carapace of a small specimen of the common spider crab, Libinia, among other hydroids not uncommon on this creature, including a species of Campanularia and Halecium
. The Biological bulletin. Biology; Zoology; Marine biology. io6 CHAS. W. HARGITT. when the stem finally contracts in a way to suggest that of Vorti- cella, though without the coiling of the stem as in the latter organism. I am inclined to regard the organ as probably pos- sessed of a tactile function. Ectopleura. — While dredging off Gay Head on board the "Fish Hawk," July 15, 1907, I was fortunate in discovering on the carapace of a small specimen of the common spider crab, Libinia, among other hydroids not uncommon on this creature, including a species of Campanularia and Halecium articulosum, a small tubularian-like hydroid having a very short stem, large hydranth, the latter being crowded with racemose clusters of medusa-buds, some almost ready to be liberated. In appearance the hydranth, in its size and general aspects, was much like Tubularia crocea, though rather larger, and the oral tentacles fewer in number. A closer inspection under a lens, and later under the low power of the microscope, soon made it evident ^~»5. FlG. 8. Ectopleura prolifica. that the specimen did not belong to Tubularia, and the liberation soon after coming to the laboratory of several medusae made this doubly certain. An examination of the medusa soon showed that we had under examination a species of Ectopleura. Since no description of the hydroid of this genus has been recorded from this region it seemed worth while to have a careful sketch made of it, which is shown in Fig. 8. The following are the chief points of diagnostic importance. Stem of hydroid very short, hardly exceeding 5 or 6 mm., and. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biol
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