Hri.LK'ilN 01' THK UNITED STATES USH COMMISSION. 



hydrotheea, the next with one on its proximal half, and tho rest of the hydrocladium being made up 

 of alternating hydrotheeate and intermediate internodes. Hydrothecse cup-shaped, margin entire. 

 Nematophores trumpet-shaped, a pair near the top of each hydrotheca, one below its base in front, 

 two on eacli intermediate internode, and others on the stem. 



('.'niiiixiiiiH'. Gnnangia borne on bases of hydrocladia, ovoid, deep, with subterminal aperture. 

 Dixii-ilniiiiiH. Off Gay Head, 18J- fathoms. Newport Harbor; Woods Hole; off Block Island. 

 I, <M Mi-go Gray. ) 



Antennularia americana Nutting. Fig. 73. 

 Monograph of Amerind! H\ ilroUl^, iart 1. The I'linmilarida-, p. ti9.) 



Ti-ii/iliniaiiiii'. Colony composed of slender, erect stems bearing hydrocladia usually in whorls of 4. 

 Proximal hydrothoca on each hudrocladium borne on a long process from the stem, there being no node 

 between it and the stem. Otherwise the arrangement of the internodes, hydrothecte, and nemato- 

 phores are as in the preceding species. 



(IIIIKIXOIIII: Gonangia oblong-ovate, with a subterminal lunate aperture. 



l>ift,-il,i<t'uiii. Off .Marthas Vineyard, AHuilm**. Waters of Rhode Island (specimen from Dr. 

 H. ('. I'liimpus). 



This species, although greatly resembling .1. nntfimiufi, differs constantly in the characters given. 

 In some cases, where a hydrooladium has been broken off and regenerated, there will lie a node below 

 the proximal hvdrothera. Otherwise the character is constant. 



Antennularia rugosa Xntting. Fig. 74. 



Mnnnj,'ni|.ii of AmiM-ii-nn Ilydroids. purl 1. Tho I'lunuilan.U-. p. 70.) 



Ti-n/iliii.111,111'. The colony, consisting of upright stems which give off hydrocladia in whorls of 6 

 or 8, tin node lietween the proximal hydrotheca on each hydrocladimn and the stem. Hydrocladia 

 supported by a remarkable thickening of the perisarc on the lower side of the proximal portion of 

 each. Nodes very distant and irregular, but the interiors of the hydrocladia have numerous annular 

 thickenings of the periderm that somewhat resemble nodes. Hydrotheoio deeper than in the other 

 species. A pair of nematophores inserted on a level with top of the hydrotheca, and others scattered 

 along the fronts of the internodes and around the stem. 



liiiiiiixiiiiii-. Not known. 



l>ixti-iliiil!n)i. Off Marthas Vineyard, 46 fathoms. (AII/ati-Hsx.) 



CLADOCARPUS. 



nf. Colony branched. Hydrocladia not forked. 

 Nematophores neither movable nor trumpet-shaped. 



friiinmonii'. Gonangia borne on the stem and protected by 

 special branchlets which spring from near the bases of the hydro- 

 cladia, and bear nematophores but no hydrothecne. 



Cladocarpus flexilis Verrill. Fig. 75. 

 (Report Com. Fish and Fisheries, 1883, p. 617.) 



Trophosome. Stem not fascicled, long and slender; hydro- 

 cladia pinnately arranged, alternate, not forked, divided into 

 internodes, each of which bears a hydrotheca, and has its cavity 

 divided by internal ridges. Hydrothecse deep, subcylindrical, 

 aperture horizontal, with a single strong anterior tooth and a 

 number of shallow lateral teeth or sinuations. Nematophorea 

 tubular, a pair slightly overtopping the hydrothecal margin, and 

 a single one below each hydrotheca, its end not rising much 

 above the level of the bottom of the latter. 

 Gotiosome. Gonangia growing on front of stem, protected by special branches borne on the bases 

 of hydrocladia and branched like deers' horns, each branch bearing a row of nematophores. 

 Dlxtrihution. Found in moderately deep water at various points along the Atlantic coast. 



75. Clod0qarpu0jfcztfft Verrill. 



A. Gonangia withjprutcctivc branchlets. 



