256 Z. ASCIDIOIDA. Bowerbankia. 
Fig 41. 
“ The animal when completely expanded is seen to possess ten 
arms of about one-third the length of the whole body, each arm being 
thickly ciliated on either side, and armed at the back by about a doz- 
en fine hair-like processes, which project at nearly right angles from 
the tentacula, remaining motionless, while the cilia are in constant 
and active vibration.” 
2. B. repens, stem creeping ; cells irregularly disposed or scat- 
tered elliptical . Polypes with 12 tentacula. Farre. 
Vignette, No. 38, page 235. 
Lagenella repens, Farre in Phil. Trans, an. 1837, 403, pi. 24. 
Hah. “ Parasitic, with a creeping stem, on Sertularia and on 
Halodactylus diaphanus. Not very common,” Farre. 
“ This species has twelve ciliated arms, not spiny. The alimen- 
tary canal is short and stout, and whilst the animal is expanded re- 
mains high up in the body. During retraction the stomach is never 
brought down to the bottom of the cell, but remains suspended from 
the upper part of it by the intestine, which appears to have some at- 
tachment at this point. The upper part of the tube, however, is 
generally brought down lower than the stomach, in order that the 
