. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 346 BULLETIN OF THE BUREAU OF FISHERIES. Key to Genera of the Syncorynid/E Found in the Beaufort Region. A. Chitinous perisarc absent or slightly developed. Hydranths elongated with the stem shorter than the hydranth or absent Gemmaria. B. Chitinous perisarc well developed. Hydranth body shorter than the stem Syncoryne. Genus GEMMARIA. Trophosome.—Perisarc absent or slightly developed; colony consists of a single elongated hydranth growing from a stolon; short capitate tentacles scattere
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 346 BULLETIN OF THE BUREAU OF FISHERIES. Key to Genera of the Syncorynid/E Found in the Beaufort Region. A. Chitinous perisarc absent or slightly developed. Hydranths elongated with the stem shorter than the hydranth or absent Gemmaria. B. Chitinous perisarc well developed. Hydranth body shorter than the stem Syncoryne. Genus GEMMARIA. Trophosome.—Perisarc absent or slightly developed; colony consists of a single elongated hydranth growing from a stolon; short capitate tentacles scattered over the whole body of the hydranth. Gonosome.—Gonophores producing medusae with two of the tentacles rudi- mentary, the other two well developed and supplied with stalked bodies espe- cially well provided with nematocysts. Fig. 2.—Gemmaria cos- tata (Gegenbaur). ? Gemmaria costata (Gegenbaur). Zandea costata Gegenbaur, Zeit. fiir Wissen. Zool, bd. vm, 1S56, p. 329. Gemmaria gemmosa Mayer, BuU. Mus. Conip. Zool., Harvard, 1900, p. 35. Gemmaria coi/a/a Mayer, The Hydromedusae, vol. I, 1910. P- 87. Trophosome.—Hydranth elongated, supported by a short pedicel provided with an annulated perisarc. The perisarc of the stolon is not annulated. Tentacles are arranged in numerous fairly definite whorls. Gonosome.—Gonophores growing from the hydranth body near the proximal tentacles. Color.—Perisarc opaque yellow, hydranths pale red. Distribution.—On sargassum collected on the seaward side of Bogue Bank. There has been much discussion regarding Gemmaria as to whether it is a genus distinct from Zanclea, but all such discussion has been from the medusa standpoint. As all the hydroids so far described have been called Gemmaria I have used that name. Mayer, who first described and figured this hydroid, confused it, at that time, with Gemmaria gemmosa McCrady, but later recognized the difference. This latter species has also given rise to much confusion, being de- scribed by
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