248 LIVERPOOL BIOLOGICAL SOCIETY. - 
left side of the body. In some cases the test is prolonged, 
especially at the posterior end, to form extensive expan- 
sions, and stolon-like processes. 
Most of these specimens of Ciona intestinalis have their 
branchial sacs infested with the parasitic Copepoda Noto- 
delphys allmani and Doropygus pulex. 
Mr. Henry Thomas of Llandudno has kindly sent me 
a number of specimens of this species which he found 
growing on the sides of the plunge bath in the Llandudno 
Hydropathic. Some of these specimens were of very large 
size, one of the largest observed by Mr. Thomas measuring 
over four inches in length. Specimens of over two inches 
long have grown on the sides within a month from the 
emptying and scrubbing of the bath. This gives some 
idea of the rate of growth of this species. 
Ascidia mentula, O. F. Muller. 
In the former report this species was only recorded from 
the Isle of Man on the authority of Forbes. The 
L.M.B.C. dredged it from a depth of twenty fathoms off 
Port Erin, on May 20th, 1888, during the cruise of the 
“Hyena.” The test is irregular in form and encloses 
several large specimens of Modiolaria marmorata. The 
tentacles are rather abnormal, being very short and stout, 
but tapering rapidly. A large Amphipod was found in the 
branchial sac, and a number of specimens of the parasitic 
Copepod Botachus cylindratus were obtained in the peri- 
branchial cavity. 
Ascidia plebeia, Alder. 
This species had been found by the L.M.B.C. in 1885 
off the south end of the Isle of Man, and it has since been 
dredged again in the same locality, off the Calf, twenty 
fathoms, during the cruise of the “‘ Hyzna,”’ on May 20th, 
1888, and also off the north coast of Anglesey, where 
