MABINE MOLLUSCA OF MADEIRA. 



241 



almost to the point of the shell, runs slightly obliquely towards the 

 right, then, with scarcely an angulation, it runs straight forward, 

 sweeps quite patulously in a semicircle round the front, and so 

 with a very gentle curve the inner lip, sharp-edged and a little 

 prominent, rises to the top, where it makes a quicker curve, and 

 then turns almost at a right angle in the line of axis to join the 

 base of the spire, where it leaves but half conceals a small shallow 

 umbilicus, round which the lines of growth appear as strongish 

 wrinkles, and the traces of longitudinal striae in exceptionally 

 good light seemed faintly more definite. — L. - 35. B. Ol7. 



Of this species Mr. Lowe, in 1827, got one good specimen at 

 Labra, near Punta de Sao Lourengo, to the east of which I got a 

 quite unmistakable fragment. These, so far as known to me, are 

 the only representatives of this well-marked species. 



Fain. Nassidj;. 



Gren. Nassa, Lam. 



10. Nassa anttquata, n. sp. 



Shell small, strongish, pale brownish white flecked with 

 chocolate-brown, compact, with a rather tall conical spire, a 

 small closely-coiled turbinated apex, a short conical rounded base, 

 a very short but strong pillar. Sculpture — Longitudinals : on the 

 first three normal whorls are about 9 rather feeble ribs, helped to 

 prominence by a row of nearly adjacent small flattened tubercles 

 which run down them ; on the lower whorls these riblets disappear 

 and only close sharp lines of growth appear, which come to 

 strength on the base but especially behind the outer lip, where 

 there is a flat strongish rather remote callus. Spirals : below 

 the suture there is a small, flat, slightly raised ribbon defined 

 on its lower side by a distinct stippled furrow ; this ribbon and 

 furrow begin to show on the third regular whorl, but are barely 

 traceable on the external callus of the outer lip ; on each of the 

 upper regular whorls there are three pronounced rounded threads, 

 rising where they cross the ribs into tubercles and separated from 

 one another by narrow furrows ; these spiral threads are barely 

 traceable on the intermediate whorls, but to the number of 9 or 

 10 become strong and crowded on the base ; at the point is a 

 strong furrow, and below it a thread twisting round the pillar 

 and defining the canal ; below it the pillar is scored by about six 

 threads and weak furrows. Colour a very pale ruddy brownish 



