LITORI^A. TURBO. PHASIANELLA. 79 



one has been formed, called Litorina, which in- 

 cludes all the shells of our own coasts that formerly 

 ranked under Tiirho, Consequently we find the 

 periwincle has changed its generic name, and 

 from Turho it is altered into Litorina. T. miiri- 

 cata is now of the same new genus, Litorina mu^ 

 ricata. (Plate 7) 



" Turho pica is a large pearly shell known as 

 the magpie. The golden-mouthed Turho is very 

 brilliant ; the aperture appears as if gilded, so fine 

 is the yellow tint. It comes from the Molucca 

 Isles. Turho smaragdus, from New Zealand, is 

 a rare and beautiful species of a bright green 

 colour. 



" Phasianella is a beautiful genus of shells, 

 formerly very costly. A small but elegant species 

 is found on our own shores, P. pullus, Turho 

 pullus of some authors. The colour is pink. 



" PJtasianella huUmoideSj from New Holland, 

 is the largest of the species, and once a very rare 

 shell. 



" The term Turritella will give you an idea of 

 the form of our last genus in the family Turhin- 

 acea. The shells are like little towers, with a 

 circular aperture. The older conchologists gave 

 the name of screw to all turreted shells, without 

 attending to the form of the aperture. Hence 

 we find screws among Turho, Buccinum, and 

 Stromhus (spindle.) 



