388 MR. R. B. WATSON ON MADEIRAN MOLLUSKS. [Mar. 18, 



the edge of the basal lip. The lowest is the strongest ; and above 

 the highest and feeblest there is some faint trace of others on the 

 whole body-whorl. The embryo whorl is quite smooth. 



Colour. Pure transparent white, with sometimes a yellowish 

 tinge ; opaque when shell not quite fresh. 



Spire elongated, ending rather abruptly in a blunt point. 



Whorls 4-4§, well rounded, long, of gradual increase in length and 

 breadth. 



Sufure oblique, deep. 



Mouth rather large, projecting, and open ; almost a semicircle 

 from the free advance from the body and full sweep of outer lip, along 

 with the great straightnes&of the line of the inner lip across the 

 bellv. Bluntly pointed above, and a little so below at point of pillar. 



Outer lip sharp and thin, slightly detached from body, and a very 

 little and openly siuuated, thrown well and roundly out from the line 

 of the body, a little projecting beyond the plane of its surface below, 

 fully arched across base, and joining point of pillar in an angulation. 

 The point of the pillar is very doubtfully, if at all, excavated. 



Liner lip blunt and rounded, very slightly projecting on pillar, so 

 as to leave a open and shallow umbilical trough, bounded externally 

 by the lowest basal thread. It crosses the body in a very straight 

 line, carried across by a shelf-like and not very narrow callus, and 

 advances a little way out from the body to join the outer lip at 

 almost a right angle. 



L. 

 B. 



Hab. Santa Cruz, 10-15 fathoms; FunchalBay, up to 50 fathoms; 

 Teneriffe. 



Of this species I have only found five specimens : probably, like 

 R. tenuisculpta, it belongs to the deeper sea. The operculum I have 

 not seen ; and in the absence of that distinguishing feature, the very 

 slight excavation at the point of the pillar seems too indeterminate 

 to require the classification of this shell with Rissoina, though I 

 doubt its continuing among the Rissoee. 



Of three specimens of R. balteata (Manzoui) sent me by Mr. 

 M'Andrew, one is this species (R. lincta), the other two are 

 certainly -R. glabrata, Miihlf. From Mr. M'Andrew' s specimen, 

 therefore, I have added "Teneriffe" as an additional locality for this 

 species. Its presence, however, among specimens of so-called 

 R. balteata led me further to inquire carefully whether it was not 

 this species which Signor Manzoni meant to describe under that 

 name. But it is impossible to think that this was the case : his de- 

 scription is quite inapplicable to R. lincta ; his figure is still more so ; 

 and, finally, he does not give R. glabrata at all as found at the 

 Canaries. Now, as I have specimens of R. glabrata taken at 

 Teneriffe by Mr. M'Andrew, it is obvious that the species I regard 

 as R. glabrata he reckons a distinct species and describes under the 

 name of R. balteata. 



