

134 



into a Short club-ahaped tentacle, while eaeh of the others lermi- 

 nates at the margin of the umbrella in a bulb destitute of tentacle ; 

 manubrium long with a simple mouth, 



H. nanus Alden. 



Amalthea Schm. Hydrocaulus emitting tubulär proccsses near 

 its proximal and ; perisarc rudimental. Hydranth abruptly distinet 

 from the hydrocaulus; the proximal tentacles larger than the distal 

 and disposed in a single verticil near the base of the hydranth, the 

 distal tentacles sattered (or eise multiverticillate?). Planoblasts 

 borne upon peduncles which spring from the body of the hydranth 

 between the proximal and distal sets of tentacles, having a deep 

 bell-shaped umbrella and four equal marginal tentacles with bul- 

 bous bases. 



A. uvifera Schm., A. Sarsii Steenstr., A, Januarii Steenstr. 



Fam. Monocaulidae. Hydrocaulus solitary, naked. Hydranths 

 with a proximal and a distal set of filiform tentacles. Gonophores 

 in the form of fixed sporosacs. 



Monocaulus AUm. (Corymorpha Auct.) Hydranth abruptly di- 

 stinet from the hydrocaulus; proximal tentacles longer than the 

 distal and disposed in a single verticil near the base of the hydranth, 

 the distal set scattered over a zone close to the summit of the hy. 

 dranth. Sporosacs borne upon peduncles, which spring from the 

 body of the hydranth between the proximal and distal sets of ten- 

 tacles. 



M. glacialis Sars, M. pendulus Ag. 



Fam. Tubularidae. Hydrocaulus developed, invested by a 

 chitinous perisarc. Hydranth with a proximal and a distal set of 

 verticillate filiform tentacles. Gonophores in the form of fixed spo- 

 rosacs. 



Tubularia L. Hydrophyten consisting of a simple or branched 

 hydrocaulus and a filiform adherent hydrorhiza. Hydranths flask- 

 shaped, abruptly marked of from the supporting stalk; tentacles 

 composing the proximal circlet larger then those composing the 

 distal one; distal circled surrounding the base of a conical hypostome. 

 Sporosacs developed upon branched peduncles, so as to form race- 

 miform Clusters, which spring /rom the body of the hydranth bet- 

 ween the distal and proximal circlet of tentacles. Embryonal deve- 

 lopment by actinulae, 



Subg. Tubularia Ag. Sporosacs with conspicuous gastrovascular 

 canals. T. indivisa L., T. Couthoui Ag., T. regalis Boeck, T. insignis 

 n. sp. Dieppe (sieben Zoll hoch, mit Köpfchen, die einen halben 

 Zoll messen). 



Subg. Thamnocnidia Ag. Spoi'osacs without gastrovascular ca- 

 nals, apical processes conical. T. larynx Ell. Sei. (= T. gracilis Harv.), 



