INVERTEBRATE ANIMALS OF VINEYARD SOUND, ETC. 709 



(?) Alcyonidium gelatinosum Johnston, (p. 496.) 



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

 Sniitt, op. cit., p. 497, Plate 12, figs. 9-13. Alcyonium gelatinosum Linne", 

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



Gulf of Saint Lawrence ; Spitsbergen to Great Britain. A few small 

 specimens, apparently belonging to this species, were dredged in the 

 deeper parts of Vineyard Sound. 



Vesicularia cuscuta Thompson, (p. 404.) 



Zool. Res., mem. v, p. 97, Plate 2, figs. 1-4 ; Smitt, op. cit., p. 501, Plate 13, figs. 

 28, 34, 35. Sertularia cuscuta Linrie", ed. xii, p. 1311. Valkeria cuscuta Flem- 

 ing, Brit. Anim., p. 550 ; Johnston, Brit. Zooph., ed. i, p. 252 ; 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 algse, Sertularia argentea, 

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

 tularia pumila ; Casco Bay, on piles of wharf. 



Vesicularia gracilis Verrill. (p. 389.) 



BowerbanTcia gracilis Leidy, Journal Acad. Nat. Sciences, Philad., ser. ii, vol. iii 

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



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

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



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



Stems clustered, csespitose, 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 algge. 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 subspiral 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 the length of the 

 cell. 



Great Egg Harbor, New Jersey, on oysters ; Savin Bock, 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 ValJceria jJustulosa, which is an allied Eu- 

 ropean species. 



