728 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Obelia dichotoma Hincks. (p. 407.) 



Brit. Hydroid Zoophytes, p. 156, Plate 28, fig. 1, 1868. Sertularia dichotoma Linne", 

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

 Johnston, Brit. Zooph., 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, on ascidians; Eastport, 

 Maine. 



Obelia longissima Hincks. 



Brit. Hydroid Zooph., p. 154, Plate 27, 1868. Sertularia longissima Pallas, Elench. 

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

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

 Brit. Zooph., ed. ii, p. 102. CampanulaHa gelatinosa Vau Beneden, Me"m. sur le 

 Campari., 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 Zooph., p. 157, Plate 29, 1868. Campanularia flabellata Hincks, 

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



Off Thimble Islands, 4 to 5 fathoms, on Astrangia ; Watch Hill, Bhode 

 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 0. commlssuralis of McCready, from Charleston, South Carolina, 

 is, perhaps, distinct from that described by Agassiz. 



Obelia commissuralis 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 Linne", sp.). ? Laomedea gelatinosa Stimpson, Invert, 

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



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

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

 . Haven Harbor, on piles ; Vineyard Sound, on floating algae. 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. Sertularia gelatinosa 

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

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

 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 Biver, near Boston (H. J. 

 Clark, t. A. Agassiz). 



