194 NUTTING [176] 



Family CAMPANULINID^S. 



Trophosome. — Colonies branched or unbranched. Hydrothecae 

 borne on pedicels, tubular, ending in an operculum composed of 

 several converging segments or triangular flaps. Hydranth with a 

 conical proboscis. 



Gonosome. — Gonangia producing free medusae or. planulae. 



CAMPANULINA. 



Trophosome. — Hydrothecae thin-walled, the upper portion cleft so 

 as to produce very long and slender teeth which form an operculum by 

 the convergence of their free ends. 



Gonosome. — Gonangia producing bell-shaped medusae, with four 

 radial canals, two or four marginal tentacles, and eight lithocysts. 



CAMPANULINA RUGOSA sp. nov. 

 (Plate XXII, figs. 1,2.) 



Trophosome. — Colony attaining a height of about Y^ inch. Stem 

 irregularly branched ; branches tending to an alternate arrangement, 

 straggling, geniculate ; stem and branches strongly and regularly annu- 

 lated throughout. Pedicels very short, with three to six annulations. 

 Hydrothecae ovoid-oblong, the distal third being composed of the oper- 

 culum consisting of ten or twelve segments. The hydranths have about 

 sixteen tentacles. 



Gonosome. — Gonangia in axils of the pedicels and branches, some- 

 times aggregated on certain branches to the exclusion of hydrothecae. 

 They are oblong-ovoid in shape and somewhat flattened on their distal 

 ends. Each gonangium contains a single medusa when mature. 



Distribution. — Juneau, Alaska (Harriman Exped.). The speci- 

 mens were found growing on Obelia. 



CALYCELLA. 



Trophosome. — Stem a creeping rootstock sending forth short an- 

 nulated pedicels. Hydrothecae tubular, thick-walled, with opercula 

 that are distinct from the hydrothecal teeth, and composed of several tri- 

 angular segments. 



Gonosome. — Gonangia borne on the rootstock, and, when mature, 

 bearing acrocysts. 



CALYCELLA SYRINGA (Linn.). 



Sertularia syringa Linn., Systema Naturae, Ed. xii, Tom. i, Pars 11, p, 

 1311, 1767. 



