33G MR. R. B.WATSON ON' MADEIRAN MOLT,USKS. [Mar. 18, 



Inner lip reflected on the pillar, leaving behind it a narrow but 

 deepish umbilical chink ; carried across the belly by a distinct cal- 

 lus, the edge of which projects free from the body-whorl. The two 

 lips meet at somewhat more than a right angle. 



Sh. M. 6. 5. 4. 3. 2. 1. 



L. ...-071 -029 -031 -019 "Oil -00G -003 '001 



B -039 -024 -025 -03G -026 -017 "0U9 '003 



Hah. Funchal Bay, 50 fathoms. 



Of this species I have found only one specimen, and it probably a 

 dead shell, though perfectly fresh. It may be a true Madeiran 

 species ; but I confess I should not be surprised were it to prove a 

 Hydrobia introduced in ballast. In the mean time I have put 

 it here among the Rissoce, believing that it is a new species, and 

 perceiving nothing to exclude it from such fellowship. 



Eissoa glabrata, von Muhlfeld. (Plate XXXVI. fig. 24.) 



Not in M'Andrew's list. 



Hub. Gorgulho, shore ; Seixal, shore ; Santa Cruz, shore ; Ponta 

 de Sao Lourenco, shore and 25-45 fathoms ; Piedade (Canieal), 25-35 

 fathoms. 



My specimens, from deep water, of this species are very few. It 

 lives abundantly on the shore beneath sheltered stones below high- 

 water mark. In spite of its smallness it is not difficult to find, its 

 white colour making it conspicuous on the black lava-stones of the 

 beach. It is best got by clearing off the loose upper shingle till one 

 readies the less movable (but not very deep- lying) under layers, 

 where one also finds R picta, R. Leacocki, Odostomia turrita, Pe- 

 dipes afra, Marinula {Auricula) mqualis, Lowe, Melampus exiguus, 

 Lowe, and other shells. 



Of the animal, Baron do Castello de Paiva, in his * Monographia 

 Molluscorum Insularum Maderensium,' says " Corpore toto albo, 

 pellucido, tentaculis brevissimis, pede oblongo." His " var. a. duplo 

 minor " may, I think, be suppressed. A difference of form, however, 

 such as he alludes to as "Subvar. Testa minus ampla . . . apertura 

 strictiore" is found, dependent on the greater contraction of the 

 outer lip. 



From the description (probably) and from the figure (certainly) of 

 R. (Cingula) balteata I infer that Signor Manzoni has made a new 

 species out of the Atlantic form of R. glabrata*, needlessly as I 

 believe — an opinion supported " certainly " by Mr. Gwyn Jeffreys, 

 who has examined Signor Manzoni' 8 specimens of R. (Cingula) 

 balteata. Mr. M'Andrew, from whom Signor Manzoni procured 

 his specimens, has kindly sent me three examples of this species. 

 Of these three, two are R. glabrata, and one is my species R. lincta. 

 I should have preferred suppressing that name of mine and adopting 

 R. balteata as perhaps intended for it, if it had been possible to take 

 the description and, still more, the figure of that species as in any 

 way applicable to my R. lincta. 



* ITo gives E. glabrata, Miihl., indeed, as found in Madeira, but he docs this 

 only nv quoting from Baron de Paiva, who refers for il to me. 



