46 Mr. R. T. Lowe on Planorbis glaber in Madeira. 
tened, not coronated spire ; in the keel of the volutions not being 
strongly plicate-toothed and raised above the sutural line; in the 
volutions not being flattened above the keel ; and lastly, in their 
less remote and strong, not tooth-like, radiating ribs or plaits. 
I am indebted to Mr. Edmund Leacock of Madeira, a young 
and zealous entomologist, for several examples of a Planorbis 
found by him in a tank in Dr. Lister’s beautiful and richly-stored 
garden at Funchal, where I understand the same shell had 
been previously obtained by Mr. J. Y. Johnson. These exam- 
ples belong unquestionably to P. glaber, Jeffr. (levis, Ald.) ; 
and, like Heliw aspersa, Mill., in another garden at Funchal, 
the species has been doubtless introduced within the last few 
years from Portugal, where Dr. Bocage, Director of the Lisbon 
Museum, finds abundantly, in stagnant water, tanks, &c., every- 
where, a shell precisely identical. Examples from Cintra, kmdly 
communicated by this able naturalist, who is at present actively 
engaged in studying the very imperfectly explored Molluscan 
fauna of his country, perfectly agree with these Madeiran speei- 
mens, one of which is remarkable for exhibiting faint traces 
of spiral striz towards the peristome on the under or lower and 
more concave side of the shell,—invalidating so far the specific 
difference, which has been, indeed, already called in question 
(see Gray’s Man. p. 260; though compare also Forbes and 
Hanley, Brit. Moll. iv. 151), between P. glaber, Jeffr., and P. 
albus, Mill, 
Lea Rectory, June 12, 1860. 
EXPLANATION OF PLATE III. 
Fig. 1. Helix delphinuloides, upper side; fig. 2, under side of the same; 
fig. 3, seen in profile. 
XI.—On a new Species of Black-fish found on the Coast of Corn- 
wall. By Dr. ALBert GUNTHER. 
Tue genus Centrolophus (or the Black-fish of British ichthyo- 
logists) comprises fishes which evidently are inhabitants of the © 
open sea, living in the Mediterranean and in the European part 
of the Atlantic, between lat. 30° and 58° N. They fall only 
occasionally into the hands of zoologists, which circumstance 
will account for the lateness of the discovery of a new European 
species. 
The specimen on which I have founded the species was found 
thrown on shore near Polperro, in the month of February of 
the present year, during rough weather, and was stuffed and 
sent to the British Museum. Fortunately Mr. Couch had 
