INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 709 



(?) ALCYONIDIUM aELATINOSUM Joliustoii. (p. 400.) 



Brit. Zooph., ed. i, p. 300, Plato 41, figs. 1-3; ed. ii, p. 358, Plate 68, figs. 1-3; 

 Smitt, op. cit., p. 497, Plate 12, figs. 9-13. Alcyoniiim (jdatinosum l.inu6., 

 Fauua Suec, ed. ii, p. 538 ; Syst. Nat., ed. xii, p. 1295. 



Gulf of Saiut Lawrence ; Spitzbergeu to Great Britaiu. A few small 

 si)ecimeiis, apparently belonging- to this species, were dredged in tbe 

 deeper parts of Vineyard Sound. 



Vesicularia cuscuta Thompson, (p. 404.) 



Zool. Ros., mem. v, p. 97, Plate 2, figs. 1-4 ; Smitt, op. cit., p. .501, P'ate 13, figs. 

 28, 34, 35. Sertularia cuscuta Linn^, ed. xii, p. 1311. Falkcria e)fl^.ita Flem- 

 ing, Brit. Anim., p. 550; Johnston, Brit. Zoopb., ed. i, p. 2.52 ; ed. ii, p. 374. 



New Jersey, northward ; northern coasts of Europe to Great Britain. 

 In Vineyard Sound it was found on hydroids attached to floating eel-grass, 

 and was also dredged in 6 to 8 fathoms, on algas, Sertularia argentea^ 

 and other hydroids ; Great Egg Harbor, ISfew Jersey, low water, on Ser 

 tularia puniila ; Casco Bay, on piles of wharf. 



Vesicularia gracilis Verrill. (p. 389.) 



BowerbanJcia gracilis Leidy, Journal Acad. Nat. Sciences, Pbilad., ser. ii, vol. iii 

 p. 142, Plate 11, fig. 38, 1855. 



Great Egg Harbor, New Jersey, to Vineyard Sound. Point Judith, 

 Rhode Island (Leidy), Vineyard Sound, 6 to 8 fathoms, on hydroids. 



Vesicularia dichotoma Verrill, new sp, (p. 404.) 



Stems clustered, coispitose, usually one or two inches high, slender, 

 flexible, white, and repeatedly forking. The branches stand in differ- 

 ent planes, so as often to produce miniature tree-like or shrub-like forms, 

 many of which generally arise close together, forming crowded tufts 

 upon rocks, oyster-shells, or alg*. When the stem or a branch divides, 

 there is a joint formed at the base of each of the forks, by the inter- 

 position of a very short segment of a dark brownish, opaque substance, 

 which contrasts strongly with the white translucent substance of the 

 rest of the stem. Zooids arranged closely in two sabspiral rows of six 

 to twelve each, just below each fork of the stem and branches, and not 

 occupying half the length of the internodes, which are naked and 

 smooth below the crowded clusters of the zooids: these are smooth, 

 greenish brown, broad oval or obovate in contraction, subcylindrical or 

 elliptical in expansion, entirely sessile, and but little narrowed at the 

 base, and so crowded as to appear imbricated. The tentacles are eight, 

 long and slender, in expansion usually more than half tlie length of the 

 cell. 



Great Egg Harbor, New Jersey, on oysters; Savin Eock, at low- 

 water ; off New Haven Light, 4 to 6 fathoms, shelly and rocky ; Thim- 

 ble Islands, in rocky tide-pools; Norwalk, Connecticut, on oysters. 

 This is probably the species recorded by Dr. Leidy from Great Egg 

 Harbor under the name of Valkeria imstulosa^ which is an allied Eu- 

 ropean species. 



