130 



P. carnea Sars (= P. albida Sars, P, tubulariae Sars), P. pro- 

 boscidea Hincks, P. aculeata R. Wagn., P. areolata Aid. 



Corynopsis Allm. Hydranths claviform, with a single circlet 

 of filiform tentacles round the base of a conical hypostome. Plano- 

 blasts borne on the body of the hydranth at the proximal side of 

 tentacular circlet. Meduaa deep bell-shaped; manubrium having 

 its mouth surrounded by foiir short capitate tentacles; radiating ca- 

 nals four, each terminating distally in a bulb, from which are deve- 

 loped two tentacles, each with a distinct ocellus at the base. 



C. Alderi Hincks. 



Fam. Cladonemidae. Hydrocaulus developed, invested by a 

 perisarc. Hydranths with two kinds of tentacles, one filiform, the 

 other capitate. Gonophores phanerocodonic with the radiating ca- 

 nals more than four, and with the marginal tentacles ramified. 



Cladonema Duj. Hydrophyten (Stauridium Duj.) consisting of 

 a branching or simple hydrocaulus arising from a creeping filiform 

 hydrorhiza, the whole invested with a chitinous perisarc. Hydranths 

 clavate with two verticils of tentacles, each verticil consisting of 

 four tentacles disposed in a cross, the tentacles of the proximal ver- 

 ticil filiform, those of the distal verticil capitate. Plauoblasts deve- 

 loped from the body of the hydranth. Mature pianoblast with a 

 deep bell-shaped umbrella; manubrium with the mouth surrounded 

 by five Ups; radiating canals, eight or ten, each continued at the 

 umbrella -margin into a tentacle with a bulbous base which carries 

 an ocellus ; branches of tentacles of two kinds, one kind very exten- 

 sile and destitute of suctorial organs, the other, situated at the pro- 

 ximal side of these, scarcely extensile and provided with terminal 

 suctorial capitula. 



Cl. radiatum Duj. 



Fam. Nemopsidae. Hydranthus with a proximal and distal 

 circlet of filiform tentacles. Gonophores medusiform plauoblasts 

 with four radiating canals and with the marginal tentacles clustered 

 and dissimilar. 



Nemopsis Ag. Hydrophyten not known. Hydranth conical; the 

 proximal circlet of tentacles surrounding the base of the hydranth, 

 the distal one situated at a short distance behind the mouth. Pla- 

 uoblasts borne between the proximal and distal circlet of tentacles. 

 Medusae, when mature, deep bell-shaped; umbrella- walls thick; ra- 

 diating canals, terminating each at the margin of the umbrella in 

 a bulb, which Supports one of the Clusters of tentacles; two of the 

 tentacles in each Cluster clavate and but, slightly contractile, every 

 tentacle carrying a distinct ocellus at its root; manubrium with 

 four dichotomously, branched oral tentacles; generative Clements 

 produced in four lobes, whose basis of attachment partly reet on 



