51 



Fig. 5. Pennaria Cavolinii. Hydranth. 

 (Inaba 1890 Fig. 90.) 



Fig. 6. Pennaria Cavolinii. Meduse, 

 (liiaba 1890 Fig. 91.) 



stem above tlie point where a brauch stands out; branchlets with similar rings at the 

 base. Stem growing upwards in numbers from a reticulate network. Hydranth one at 

 the end of stem, branch and branchlets, large and flask-shaped, mouth somewhat expanded, 

 with about twelve finger-shaped tentacles forming a single row a little above the base of 

 the hydranth, longer than the latter when extended; there are about 20 knobbed tentacles 

 forming roughly four rows, one of the rows separated from the others and situated on 

 the neck of the polyp, the rest in the lower part. 



Gonosome. Medusoid not becoming free, attached to the hydranth above the row of fili- 

 form tentacles; umbrella very deep, elongated ellipsoidal, with four small processes on the 

 margin; manubrium swollen and Alling up the subumbrellar cavity, without mouth. 



Colour. Stem dark brown, branches yellowish brown, branchlets almost colourless; 

 medusa and body of hydranth light red, the four radial canals deep red, tentacles 

 colourless. 



Locality. West of Misaki, Shishigahana, Sagami Sea. 



Date. Gonophores found in July, 1889. 



This is one of the most beautiful species of the Hydroids of Misaki, the numerous 

 stems with alternate branches like feathers standing out particularly beautiful. The hy- 

 dranths are of different size, the one crowning the stem being largest, about 3 mm long, 

 the terminal ones of the branches Coming next, being about 2 mm, and those borne on 

 the branchlets are smallest. being about 1,5 mm. The filiform and knobbed tentacles 

 being only slightly separated from each other, the latter being scattered rather than for- 

 ming rows. The medusae are attached to the axils of the filiform tentacles; there are 

 several of theni, but only one is usually ripe, and niay be larger than the hydranth." 

 (Inaba 1890.J 



Zwischen Inabas Beschreibung der Meduse und deren Abbildung scheint ein Wider- 

 spruch insofern zu bestehen, als es im Text heißt, das Medusoid werde nicht frei; die Abbil- 

 dung dagegen zeigt keinen Stielansatz am Apex und stellt offenbar eine zwar kurzlebige, 

 aber freie Meduse dar. 



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