382 MR. R. B. WATSON ON MADEIRAN MOLLTJSKS. [Mar. 18, 



10-15 fathoms; Piedade (Canical), 15-35 fathoms; Ponta de S. 

 Lourenco, 25-45 fathoms ; Porto Santo, up to 50 fathoms ; Porto 

 da Cruz, 50 fathoms ; Funchal, up to 50 fathoms. 



I have no doubt this is the Cingula concinna of Monterosato, 

 whose figure is admirable, and his description, though short, charac- 

 teristic ; one specimen of his species, kindly sent me by him, I have 

 also compared. Is the species really distinct from R. semistriata 1 

 My impression is that they are the same ; and in this I am fortified 

 by the opinion of Mr. Gwyn Jeffreys. Still the two species are un- 

 questionably distinguishable. R. concinna is smaller, more in steps, 

 when mature thicker, hunchier altogether, lip more thickened inter- 

 nally, pillar thicker, point of it more hunchy, mouth smaller and 

 rounder, lines of growth more distinct, the supersutural striae on 

 upper whorls more distinct, spots of colour more broken. None of 

 these are strongly marked features, but may serve in the mean time 

 to justify our acceptance of the distinction into two species of these 

 forms, the responsibility of the distinction resting with the Marquis. 

 What relation does this species bear to R. callosa, Manzoni 1 My 

 belief is that they are probably the same ; but neither from his de- 

 scription nor from his figure, nor even from the specimens kindly 

 sent me by Mi 1 . M'Andrew, do I find myself able to arrive at any 

 certainty. If they are the same, Manzoni's name must claim priority. 



There are at least two very marked varieties of this species, one 

 being much thinner, more in steps, and somewhat more elongated 

 than the other ; but the two forms are so perfectly linked by inter- 

 mediate bonds as to defy distinction. There are also great differences 

 in size. Some thus approach R. depicta, from which they differ, 

 however, in this, that in this species the longitudinal striae are weaker 

 than in R. depicta, the white of the base round the pillar is 

 smaller and less opaque, the red spots are less brown, but, above 

 all, the embryonic tip shows neither the microscopic striae nor the 

 dark brown stain of that species. 



The other very small variety resembles R.pulchcrrima,hxnt is dis- 

 tinguishable by its whole form and by the spiral striss of the surface. 



Piissoa depicta, Mauzoni. (Plate XXXV. fig. 20.) 



Cingula macidata, Monterosato. 



Rissoa punctifera, Watson, MS. 



Hab. Gorgulho, shore ; Machico, 10-15 fathoms ; Piedade (Ca- 

 nigal), 15-35 fathoms ; Ponta de S. Lourengo, 25-45 fathoms ; Porto 

 da Cruz, 50 fathoms ; Funchal Bay, 50 fathoms ; Teneriffe (M'An- 

 drew's dredgings,^rfe Manzoni). Sicily : Palermo, shore ; Trapani, 

 coralligenous sand {fide Monterosato). 



Baron Schwartz v. Mohrenstern marked this species as " not de- 

 termined, but seems a variety of R. semistriata, Mont." Mr. Gwyn 

 Jeffreys adopts the same view. It is easily distinguishable by its 

 labial varix and thicker lip, want of any angulation at the lower 

 inner corner of mouth, presence of one furrow on body-whorl much 

 stronger than the others, droop of upper corner of mouth below 

 line of this furrow, the peculiarity of the spiral striations as above 



