728 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Obelia dichotoma Hincks. (p. 407.) 



Brit. Hydroid Zoophytes, p. 156, Plate 28, fig. 1, 1868. Sertiilaria dichotoma Linn^, 

 Syst. Nat., ed. x, sp. 24 ; ed. xii, sp. 22, p. 1312. Laomedea dichotoma, var. a, 

 Johuston, Brit. Zooph., ed. ii, p. 102, Plate 26, tigs. 1, 2. 



Vineyard Sound, northward ; northern coasts of Europe to Great 

 Britain. Off Gay Head, 8 to 10 fathoms, on ascidiaus ; Eastport, 

 Maine. 



Obelia longissima Hincks. 



Brit. Hydroid Zooph., j). 154, Plate 27, 1868. Scrtularia longissima Pallas, Elench. 

 Zooph., p. 119, 1766 (excl. synonymy). Laomedea longissbna Alder, Trans . 

 Tynes. F. C, vol. iii, p. 121 (t. Hincks). Laomedea dichotoma, var. 6, Johnston, 

 Brit. Zooph., ed. ii, p. 102. Campannlaria gelaiinosa Van Beueden, M6m. sur le 

 Campan., p. 33, Plates 1, 2 (t. Hincks). 



Gay Head ; Cape Ann, Massachusetts ; Bay of Fuudy. Coasts of 

 Belgium and Great Britain. 



Obelia flabellata Hincks. (p. 390.) 



Brit. Hydroid Zooph., p. 157, Plate 29, 1868. Campannlaria flalelTata Hincks, 

 Ann. and Mag. Nat. Hist., ser. iii, vol. xviii, p. 297. 



Off TLirable 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- 

 missiiralis of Agassiz, and may prove to be identical with it. But the 

 original 0. commissuralis of McCready, from Charleston, South Carolina, 

 is, perhaps, distinct from that described by Agassiz. 



Obelia co^imissuralis McCready. Plate XXXYII, fig. 281. (p. 327.) 



Proc. Elliott Soc, vol. i, 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 ; 

 (?) A. Agassiz, Catalogue, p. 91, fig. 134. Laomedea dichotoma Leidy, op. cit., p. 

 138, Plate 11, fig. 36 (not Linue, sp.). ? Laomedea geJatinosa Stimpson, Invert, 

 of Grand Manan, p. 8, 1853 {not Pallas, sp.). 



Charleston, South Carolina (McCready). New Jersey (Leidy). New- 

 port, Rbode Island, and Nahant, Massachusetts (A. Agassiz). New 

 Haven Harbor, on piles ; Yineyard Sound, on floating algte. Grand 

 Manan (Mills, t. A. Agassiz). 



The northern specimens possibly belong to the preceding species. 



Obelia gelatinosa Hincks. (p. 391.) 



British Hydroid Zoophytes, p. 151, Plate 26, fig. 1, 1868. Scrtularia gelatinosa 

 Pallas, Elench. Zooph., p. 116, 1766. Laomedea gelatinosa Lamouroux, Polyp 

 Flex., p. 92; Johuston, Brit. Zooph., ed. ii, p. 104, Plate 27, fig. 1 (var. 6). 

 Vamimnularia gelatinosa Lamarck, Auim. 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 



g Wharf, abundant. Mouth of Charles River, near Boston (H. J. 



k, t. A. Agassiz). 



