. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. HYDROIDS OP BEAUFORT, NORTH CAROLINA. Genus AGLAOPHENIA. 377 Trophosome.—Hydrothecal margin provided with sharp teeth; posterior intrathecal ridge present; one mesial and two supracalycine nematophores for each hydrotheca always present. Gonosome.—Gonangia inclosed in true corbulae, formed of modified pinnae. There are no hydro- thecae at the bases of the gonangial leaves. Key to the Species op Aglaophenia Found in the Beaufort Region. A. Colonies branched. a. Branching regularly pinnate
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. HYDROIDS OP BEAUFORT, NORTH CAROLINA. Genus AGLAOPHENIA. 377 Trophosome.—Hydrothecal margin provided with sharp teeth; posterior intrathecal ridge present; one mesial and two supracalycine nematophores for each hydrotheca always present. Gonosome.—Gonangia inclosed in true corbulae, formed of modified pinnae. There are no hydro- thecae at the bases of the gonangial leaves. Key to the Species op Aglaophenia Found in the Beaufort Region. A. Colonies branched. a. Branching regularly pinnate or twice-pinnate A. acacia. b. Branching irregular, branches coming off singly or in pairs from the anterior of the stem. A, rigida. B. Colonies unbranched A. minuta. Aglaophenia acacia Allman. Aglaophenia acacia Allman, Challenger Report, pt. -xx. Hydroida, 1883. p. 38. Trophosome.—Colony reaching a height of 6 inches. There arc no branches on the proximal portion of the stem, but distally they are given off regularly, in opposite or subopposite pairs. These branches ^.y^-^^^A. Fig. -Aglaophenia acacia Aihnstn. A, portion of hydrocladium: B. hydrotheca. side view, more highlymagnified; C. hydro theca, front view, more highly magnified; D. corbula (after .\llman). may also give off branches in pairs to form a twice-pinnate arrangement. The whole colony has a much more spreading appearance and is much more graceful than .4. rigida. The intemodcs of the main stem arc not distinctly marked off, or at any rate not so distinctly as some other species; the h)'drocladial shoulder is near the middle of each intemode. Each intemode has two nematophores, one above and one below the shoulder. The hydrocladia are very regularly arranged, are all nearly the same length, from 5 to 8 mm., throughout the larger portion of the branch or branchlet, but gradually shorten toward the distal end to produce a gracefully rounded effect. The hydrocladia arc divided into regular inter- nodes, eac
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