434 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [728] 



OBELIA DIOHOTOMA Hincks. (p. 407.) 



Brit. Hydroid Zoophytes, p. 156, Plate 28, fig. 1, 1868. Sertularia dichotoma Linn 6, 

 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 eopr-t* of Europe to Great 

 Britain. Off Gay Head, 8 to 10 fathoms, u a.scidians; Eastport, 

 Maine. 



OBELIA LONGISSIMA Hincks. 



Brit. Hydroid Zooph., p. 154, Plate 27, 1868. Sertnl c.-ia iongissima Pallas, Elench. 

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

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

 Brit. Zooph., ed. ii, p. 102. Campanularia gelatinosa Van Beueden, Me m. 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 Zooph., p. 157, Plate 29, 1868. Campanularia fldbellata Hincks, 

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



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

 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. commissuralis 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 Linn, sp.). f Laomedea gelatinosa Stimpson, Invert, 

 of Grand Manan, p. 8, 1853 (not 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 alga?. Grand 

 Manan (Mills, t. A. Agassiz). 



The northern specimens possibly belong to the preceding species. 



OBELTA 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. 6). 

 Campanularia 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 

 Long Wharf, abundant. Mouth of Charles Hiver, near Boston (H. J. 

 Clark, t. A. Agassiz). 



