730 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



expanded border, baviug 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 

 rims 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 gonothecne (reproduct- 

 ive capsules) arise in the axils of the hydroid cells, and, like the latter, 

 the gonothecceai^e often secund on the branchlets. The male and female 

 capsules are different in form. The male gonothecse are oblong, sub- 

 fusiform, about three times as long as broad, obtusely rounded at the 

 cud, more gradually tapered to the base ; the female gonothecic 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 thanl™™; length of female 

 gonotheca:>, about 1"""; breadth, 0.40'""' to 0.45'"'"; length of male gono- 

 thecne, 1'""' to 1.10'"'" ; breadth, 0.30'"'" to 0.40'""' ; diameter of hydro- 

 thecne, 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 R. halecimim 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 hydrothecae and polyps. The female gonothecne, 

 although similar, differ in having the distal ends decidedly emargiuatej 

 with the outer angle somewhat produced, though much less so than in 

 those of H. Beanii. 



Antennularia antennina Fleming, (p. 497.) 



Brit. Auim., p. 546; Johiistou, Brit. Zooi^h., ed. ii, p. 86, Plate 19, figs. 1-3; 

 Hiucks, Brit. Hydr. Zoopb., p. 280, Plate 61. Serialaria antennina Linnd, Sj'st. 

 Nat., ed. x, 1758; ed. xii, p. 1310. AntennuJaria indmsa Lamarck, Aniui. sans 

 Vert., ed. ii, vol. ii, p. 156. 



Martha's Vineyard to Bay of Fundy ; northern coasts of Europe to 

 Great Britain and France. Off Gay Head, 8 fathoms ; Casco Bay, 6 to 

 30 fathoms ; Bay of Fundy, 10 to 60 fathoms, not uncommon. 



Aglaophenia arborea Verrill. 



Plumiilaria arhorea Desor, Proc. Boston Soc. Nat. Hist., vol. iii, p. 65, 1848; A. 

 Agassiz, Catalogue, p. 140. 



The original specimen of this species is still preserved in the collection 



