62 NATURAL HISTORY OF 



from the stolon, and an outer membranous one. 

 Tentacles number 40 — 50, set in imperfect rows. 



Prof. Allman, in his " Notes on the Hydi'oida/^ in 

 Annals of Nat. Hist., July, 1864, describes fully the 

 structure of the tentacles, which are very small. 



Gekus IV. Gymnocortne, Hincks. 



Polypites sessile, on a creeping filiform stolon in- 

 vested with a chitinous polypary. Tentacles numerous, 

 the distal ones in a verticil round a conical proboscis, 

 the others scattered over the body. Rejproduction 

 unknown. — T, H. 



1. G. coronata, T. R. 



Hab. : Salcombe Bay {T. H.). Polypite veiy minute, 

 body reddish, proboscis white, with 40 or more ten- 

 tacles, of which 8 or 9 at the distal end are thicker, 

 have larger capitula, and form a verticil. 



Described by Mr. Hincks in Annals of N. H., 

 August, 1871. 



FAMILY VI. PENNARIID^. 



Polypites clavate or subcylindrical, with two hinds of 

 tentacles, one hind capitate oAid disposed in one or more 

 verticils, the other filiform and without capitula. 



I have altered the diagnosis of this family so as to 

 include all the genera Cladonema, Stauridium, Vorti- 

 clava, and Acharadria. Prof. Allman places Cladonema 

 in a distinct family, which he calls Cladonemidce, and 

 ranks the three other genera amongst the Pennariidce. 

 Mr. Hincks places Cladonema and Stauridiutn in the 

 family Stauridiidce, and Vorticlava and Acharadria 

 amongst the Pennariidce. His reason for separating 



