436 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [730] 
expanded border, having a circle of dots near the edge; the older or 
secondary cells, arising from these, are rather elongated, narrow, cylin- 
drical, with slightly expanded rim, more or less bent and crooked or 
geniculate at base, and usually with one or two irregular constrictions. 
Many of the older cells are much elongated, and have two or three old 
tims below, separated by distances equal to two or three times the 
diameter. The hydroids are long, slender, with numerous long tentacles, 
much exsert from the cells.: The branchlets and gonothec (reproduct- 
ive capsules) arise in the axils of the hydroid cells, and, like the latter, 
the gonothecz are often secund on the branchlets. The male and female 
capsules are different in form. The male gonothece are oblong, sub- 
fusiform, about three times as long as broad, obtusely rounded at the 
end, more gradually tapered to the base; the female gonothece are 
broader, somewhat flattened, usually a little shorter, gradually expand- 
ing from the narrow base to near the distal end, which is emarginate ; 
the outer angle broadly rounded and slightly produced ; the inner angle 
prolonged into a short cylindrical hydroid cell, with the edge slightly 
everted, from which two hydroids usually protrude. Height, 75™™ to 
150™™; diameter of stems, seldom more than 1™; length of female 
gonothece, about 1™™; breadth, 0.40™™ to 0.45™; length of male gono- 
thece, 1™™ to 1.10™"; breadth, 0.30™™ to 0.40™™; diameter of hydro- 
thece, about 0.12™™, 
Great Egg Harbor, New Jersey, on oysters, just below low-water 
mark; Long Island Sound, near New Haven, in 2 to 6 fathoms, abundant, 
and also in brackish water on floating timber; Thimble Islands, 2 to 6 
fathoms; Buzzard’s Bay and Vineyard Sound. 
This species is more nearly allied to H. halecinum of Europe and 
Northern New England than to any other described species. It is a 
much more slender and delicate species, with longer joints, and narrower 
and more elongated hydrothecze and polyps. The female gonothece, 
although similar, differ in having the distal ends decidedly emarginate; 
with the outer angle somewhat produced, though much less so than in 
those of H. Beanii. 
ANTENNULARIA ANTENNINA Fleming. (p. 497.) 
Brit. Anim., p. 546; Johnston, Brit. Zodph., ed. ii, p. 86, Plate 19, figs. 1-3;- 
Hincks, Brit. Hydr. Zoéph., p. 280, Plate 61. Serlularia antennina Linné, Syst. 
Nat., ed. x, 1758; ed. xii, p. 1310, Antennularia indivisa Lamarck, Anim. sans 
Vert., ed. ii, vol. ii, p. 156. 
Martha’s Vineyard to Bay of Fundy; northern coasts of Europe to 
Great Britain and Frances Off Gay Head, 8 fathoms; Casco Bay, 6 to 
30 fathoms ; Bay of Fundy, 10 to 60 fathoms, not uncommon. 
AGLAOPHENIA ARBOREA Verrill. 
Plumularia arborea Desor, Proc. Boston Soe. Nat. Hist., vol. iii, p. 65, 1848; A. 
Agassiz, Catalogue, p. 140. 
The original specimen of this species is still preserved in the collection 
