TURBO. TURBAN. 19.3 



spiral perforation: length three-eighths of an inchj breadth 

 a quarter. 



Variety. Strongly striate transversely. Fig. 24, 25. 



On the leaves of Fuci. v. v. 



2. Turbo Puteolus. Caverned Turban. Fig. .90, 91. 



Shell oblong-oval, thin, semitransparent, striate or wrin- 

 kled transversely, whitish covered with a dark purple skin: 

 spires three or four, the first very large and produced in 

 front, the others placed laterally, but raised rounded and 

 well defined : aperture- large, roundish-oval, rounded and 

 not spread at the front margin 9 the outer-lip thin ; pillar- 

 lip with a broad deep groove, ending in a very large deep 

 and somewhat spiral perforation : length nearly halt aninch ; 

 breadth a quarter. 



Variety. With three or four pale bands on the body vo- 

 lution which continue round the smaller ones in a single 

 band. 



This very distinct species, which we have taken both in 

 Dublin bay and on the rocks between Teignmouth and 

 Dawlish, may be easily discriminated from T. pallidulus, 

 by its elongated shape and prominent spire, and very large 

 groove and perforation. When placed on a table, with the 

 outer margin in front, the T. pallidulus has a somewhat 

 triangulur appearance, in consequence of the lateral volu- 

 tions being concealed from the view, and the dilatation of 

 the front margin. The T. Puteolus in the same position 

 has a well rounded and rather oblique outline, with the la- 

 teral volutions very visible, and projecting : the front mar- 

 gin is also well rounded and not dilated. The T. Lacuna 

 lias a nearly globular appearance, with the lateral volutions 

 rather prominent. 



We have found it both in Dublin bay, and on the rocks 

 between Teignmouth and Dawlish, in Devonshire, attached 

 to Fuci. v. v. 



3. Turbo Lacuna. Excavated Turban. Fig. 87, 88, 89. 

 Helix Lacuna. Montagu, pi. 13. f. G. 



Neritarufa. Da Costa.pl 8.f. 12 Dorset Cat.^l. 14.f. 12. 



Shell nearly globular, thin, semitranspiircnt, smooth but 



lot glossy, covered with a thin skin : spires four, the first 



s very 



