PEDIGELLINA. 375 
Famity PEDICELLIN A. 
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when at rest, and are not withdrawn into the polypidom.—Dr.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. 
l. PEpICELLINA EcHINATA, Fi/lis. 
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 
aesemblance 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 Fleetwood, 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 
