PEDICELLINA. 375 



FAMILY PEDICELLINA. 

 Genus XXIX. PEDICELLINA, Sars. 



Gen. Char. Polypes invested with a thin transparent poly- 

 pidom, pedicled, clavate, rising from a filiform creeping shoot. 

 The club abdominal, oblong, dilatable, encircled above with a 

 series of short ciliated tentacula, which roll themselves up 

 when at rest, and are not withdrawn into the polypidom. Dr. 

 Johnston. 



1. PEDICELLINA ECHINATA, Ellis. 



Hab. Parasitical on corallines and seaweeds between tide- 

 marks, but especially near low-water mark. 



Polypes gregarious or clustered, from a creeping transpa- 

 rent fibre. Hassall had called it Cardua, from the great 

 resemblance which the polypes bear to the heads of thistles, 

 which is strengthened by the presence of hairs upon their 

 surface. 



2. PEDICELLINA GRACILIS. 



Hab. On a buoy moored near Pleetwood, Hincks; on 

 the coast of Scotland, Mr. Goodsir. 



Abundance of fine specimens of this species were got by 

 the Rev. Mr. Hincks at the above-mentioned habitat. The 

 most marked character is the expansion of the stem towards 



