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



Mouth almost disconnected from body-whorl ; a very perfect oval, 

 lying a little transverse to the length of the shell ; scarce contracted 

 across the belly, and hardly at all narrowed towards the upper 

 corner ; open ; especially patulous below ; surrounded by a heavy 

 margin, with a pad at upper corner. 



Outer lip enormously thrown out, from the form of the mouth, the 

 thickness of the shell, and above all, by the great projection of the 

 1 abial varix. This varix is thick, white, and scored by the longitu- 

 dinal and spiral striolations, which, however, do not appear on the 

 lip front. It is sinuated above, but not channelled below. At its 

 junction with body-whorl it leaves a deep sharp narrow chink. It is 

 roundly flattened on its front surface, and edged internally with a 

 narrow, blunt, and slightly projecting flange, which sweeps round the 

 whole mouth. This flange -sometimes fails to project beyond the 

 plane of the surface, and then merely forms a kind of shelf; some- 

 times it is followed deeper within the mouth by another shelf. 

 Outside of this flange a slight marginal edging sweeps round parallel 

 to the extreme outline of the varix. 



Pillar-Up is formed internally by the labial flange, which here 

 becomes a mere shelf, and externally by the marginal edging of the 

 outer lip, which, sweeping round to the point of the pillar, splits off 

 jaggedly from the labial varix, forms a sharp, narrow, and reflectedly 

 projecting edge between the mouth and the huge and deep umbilicus, 

 and hardly touches the body-whorl except to bury the umbilical 

 ridge and to unite itself to the pad of the outer lip. 



Hab. Gorgulho shore; Santa Cruz, 10-15 fathoms; Machico, 

 10-15 fathoms ; Monte de Piedade (Cani§al), 15-35 fathoms ; Ponta 

 de Sao Lourenco, 25-15 fathoms ; Porto Santo, up to 50 fathoms. 



Mr. Gwyn Jeffreys says of this species, "A very beautiful and 

 new species, allied to R. costata, Adams." The basal ridge and 

 fossae and the high, sharp, narrow ribs have some suggestion of a 

 esemblance ; but the short hunchv form (whence I have named 

 it), the smooth surface, and prodigious umbilicus are far more 

 elements of contrast. I doubt its being a Rissoa ; but I have 

 unfortunately never found the living animal, nor even met with the 

 operculum. 



Rissoa macandrewi, Manzoni. (Plate XXXIV. fig. 8.) 



Hab. Funchal Bay, up to 50 fathoms ; Cruz Point, 50 fathoms ; 



Canary Islands (Manzoni, from M'Andrew's dredgings). 



In some of its forms R. macandrewi greatly resembles some forms 



of R. canariensis ; but the spire rises more in steps, the last three 

 horls are less attenuated, the ribs are wider-set, are broader, and 

 wer ; the spiral scratch ings are much more distinct. The heavy 



white labial rib and the absence of the brown stain either on this 



lib or on the tip of the apex are very distinctive. Manzoni's figure 



