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. (Icevis, Aid.) ; 

 and, like Helix aspersa, Mull., 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, kindly 

 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 speci- 

 mens, one of which is remarkable for exhibiting faint traces 

 of spiral striae 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, Mull. 



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. 



XL — On a new Species of Black-fish found en the Coast of Corn- 

 wall. By Dr. Albert Gunther. 



The 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 



