of South Devon and South Cornwall. 203 
17. L. vulgaris, Moll, Microscopical Journ. (Zoophytology, 
pl. 18. fig. 3). 
Syn. L. alba, Hincks, Mic. Journ. (Zoophytology, pl.;30. fig. 2). 
Abundant on stone from 30 fathoms, south-west of Polperro. 
In a paper published in the ‘ Proceedings of the Dublin Uni- 
versity Zool. and Botan. Assoc.’ vol. ii. pt. 1. p. 67, I have de- 
scribed a Lepralia under the name of LZ. alba. It was obtained 
by Mr. Hyndman, of Belfast, from deep water off the coast of 
Antrim. The Cornish stone which yielded the LZ. Woodiana 
has supplied me with abundant specimens of this form in the 
freshest condition; and,I now find that I have fallen into the. 
very error which I have just corrected in Mr. Busk’s description 
of the preceding species, and have represented as avicularia 
what are in truth vibracular organs. But Lepralia alba with 
vibracula is plainly identical with the L. vulgaris of Moll—a 
common Mediterranean species, which has also been found at 
Madeira. My species must therefore be cancelled, and the L. 
vulgaris placed on our list in its stead. Thus is added another 
to the number of forms common to the Mediterranean and the 
British seas. 
[Coast of Antrim, on shell.] 
18. LZ. variolosa, Johnston. 
Very common on shells and stones ; abundant on Pinne from 
60 fathoms: Brixham trawl-refuse; Start Bay, &c. 
19. L. nitida, Fabricius. 
Common, especially in the littoral zone: on stones between 
tide-marks: also on Eschara foliacea from 30 fathoms, &e. A 
favourite habitat is the surface of a fine Sponge which is found 
on rocks at Torquay, near low-water mark. 
In the young state, the ribs present the appearance of sub- 
erect spines surrounding the margin of the cell; and the spe- 
cies bears the closest resemblance, as noted by Dr. Johnston, to 
one of the spiniferous Membranipore. 
20. L. Peachii, Johnston. 
Extremely abundant, from moderate depths to 60 fathoms. 
21. L. ventricosa, Hassall. 
Not uncommon: on stones from deep water, Cornwall, &c. 
Start Point (J. S. Bowerbank). 
22. L. innominata, Couch. 
Common: Torbay, abundant on shell; off Polperro, on stone 
from 40 & 30 fathoms depth, &e. Start Point (J.S. Bowerbank). 
