in d. Naturgesch. d. nied. Thiere währ. d. Jahre 1872—1875. 443 



the walls of the manubrium and partly extend^for a greater or less 

 distance along the lenght of the radiating canals. 



N. Gibbesii Mc Cr. 



Fam. Pennaridae. Hydrocaulus developed or not. Hydrauths 

 with two kinds of simple tentacles, one filiform, the other capitate. 

 Gonophores medusiform plauoblasts with four radiating canals and 

 one or four more or less developed simple marginal tentacles. 



Pennaria Goldf. Hydrophyton composed of a symmetrically 

 ramified hydrocaulus, rooted Ijy a creeping filiform hydrorhiza, the 

 whole iuvested with a chitinous perisarc. Hydranths flask-shaped, 

 with the filiform tentacles constituting a proximal set, and arranged 

 in a Single verticil round the base of the hydranth, aud the ca- 

 pitate tentacles a distal set scattered on the body of the hydranth. 

 Gonophores developed in a more or les perfect verticil between the 

 proximal and distal sets of tentacles. Urabrella deeply ovate; ma- 

 nubrium large, destitute of oral appendages; marginal tentacles four, 

 rudimental; uo ocelli. 



P. Cavolinii Ehrbg., P. gibbosa Ag. 



Halocordyle n. gen. (= Globiceps Ayres, Eucoryne Leidy). 

 Hydrophyton composed of a symmetrically ramified hydrocaulus, 

 rooted by a creeping filiform hydrorhiza, the whole invested with 

 a chitinous perisarc. Hydranths flask-shaped, with the filiform ten- 

 tacles forming a single verticil at the base of the hydranth, the ca- 

 pitate much shorter than the filiform, arranged in one or more 

 distinct verticil towards the distal extremity of the hydi-anth. 

 Gonophores phanerocodonic, developed between the filiform tenta- 

 cles and the proximal verticil of the capitate tentacles. Um])rella 

 deeply ovate, manubrium large, destitute of oral apendages; mar- 

 ginal tentacles four, rudimental ; ocelli absent. 



H. tiarella Ayres (= Eucoryne elegans Leidy). 



Stauridium Duj. Hydrophyton consisting of a simple or irre- 

 gularly branched hydrocaulus, arising from a creeping filiform hy- 

 drorhiza, the whole invested with a perisarc. Hydranths clavate, 

 with one or more verticils of capitate tentacles and one verticil of 

 filiform tentacles, the tentacles in each being four in number and 

 disposed in a cross; the verticil of filiform tentacles placed at the 

 proximal side of the others. Planoblasts developed from the Lody 

 of the hydranth.* Umbrella deep bell-shaped; manubrium with the 

 mouth simple; marginal tentacles four, nodulated with Clusters of 

 thread-cells and having a distinct ocellus on the l)asal bulb. 



St. productum Wrght. 



Vorticlava Alder. Hydrocaulus simple, destitute of a conspi- 

 cuous perisarc; hydrorhiza a filiform stolon, Hydranth claviform, with 

 two verticils of tentacles; teutacle's composing the proximal verticil 



