434 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [728] 
OBELIA DICHOTOMA Hincks. (p. 407.) 
Brit. Hydroid Zobphytes, p. 156, Plate 28, fig. 1, 1868. Sertularia dichotoma Linné, 
Syst. Nat., ed. x, sp. 24; ed. xii, sp. 22, p. 1312. Laomedea dichotoma, var. a, 
Johnston, Brit. Zodph., ed. ii, p. 102, Plate 26, figs. 1, 2. 
Vineyard Sound, northward; northern coasts of Europe to Great 
Britain. Off Gay Head, 8 to 10 fathoms, ci: >scidians; Eastport, 
Maine. 
OBELIA LONGISSIMA Hincks. 
Brit. Hydroid Zodph., p. 154, Plate 27, 1868. Sertus ¢~ia fongissima Pallas, Elench. 
Zobph., p. 119, 1766 (excl. synonymy). Laomedea longissima Alder, Trans. 
Tynes. F.C., vol. ili, p. 121 (t. Hineks). Laomedea dichotoma, var. b, Johnston, 
Brit. Zodph., ed. ii, p. 102. Campanularia gelatinosa Van Beneden, Mém. sur le 
Campan., p. 33, Plates 1, 2 (t. Hincks). 
Gay Head; Cape Ann, Massachusetts; Bay of Fundy. Coasts of 
Belgium and Great Britain. 
OBELIA FLABELLATA Hincks. (p. 390.) 
Brit. Hydroid Zodph., p. 157, Plate 29, 1868. Campanutaria flabellata Hincks, 
Ann. and Mag. Nat. Hist., ser. iii, vol. xviii, p. 297. 
Off Thimble Islands, 4 to 5 fathoms, on Astrangia ; Watch Hill, Rhode 
Island, on Laminaria ; Wood’s Hole, on old wreck, in the passage. 
Coasts of Great Britain. 
The hydrarium of this species very closely resembles the Obelia com- 
missuralis of Agassiz, and may prove to be identical with it. But the 
original O. commissuralis of McCready, from Charleston, South Carolina, 
is, perhaps, distinct from that described by Agassiz. 
OBELIA COMMISSURALIS McCready. Plate XX XVII, fig. 281. (p. 327.) 
Proc. Elliott Soc., vol. 1, p. 197, Plate 11, figs. 5-7, 1859 ; (?) Agassiz, Contribu- 
tions, vol. iv, pp. 315, 351, Plate 33 (except fig. 2), Plate 34, figs. 10-21, 1862 ; 
(2) A. Agassiz, Catalogue, p. 91, fig. 134. Laomedea dichotoma Leidy, op. cit., p. 
_ 338. Plate 11, fig. 36 (not Linné, sp.). ? Laomedea gelatinosa Stimpson, Invert. 
of Grand Manan, p. 8, 1853 (nol Pallas, sp.). 
Charleston, South Carolina (McCready). New Jersey (Leidy). New- 
port, Rhode Island, and Nahant, Massachusetts (A. Agassiz). New 
Haven Harbor, on piles; Vineyard Sound, on floating alge. Grand 
Manan (Mills, t. A. Agassiz). 
The northern specimens possibly belong to the preceding species. 
OBELIA GELATINOSA Hincks. (p. 391.) 
British Hydroid Zoéphytes, p. 151, Plate 26, fig. 1, 1868. Sertularia gelatinosa 
Pallas, Elench. Zooph., p. 116, 1766. Laomedea gelatinosa Lamouroux, Polyp 
Flex., p. 92; Johnston, Brit. Zodph., ed. ii, p. 104, Plate 27, fig. 1 (var. 5). 
Campanularia gelatinosa Lamarck, Anim. sans Vert., ed. ii, p. 134 (t. Hincks). 
Laomedea gigantea A. Agassiz, Catalogue, p. 86, 1865. 
New Jersey to Massachusetts Bay; northern coasts of Europe, from 
North Cape to Belgium and Great Britain; low-water to 20 fathoms. 
Great Egg Harbor, New Jersey, on oysters; New Haven, on piles of 
Long Wharf, abundant. Mouth of Charles River, near Boston (H. J. 
Clark, t. A. Agassiz). 
