TURBAN-SHELLS. 



83 



Fig- 



It has a strong, solid, turban-shaped shell, whose 

 rusty brown whorls are banded with 

 raised spiral lines. These lines are 

 broken or beaded, and sometimes are 

 dotted with black, giving the shell a 

 very characteristic appearance. 



The operculum, as in nearly all of 

 this group, is thin, horny and circular. 

 The umbilicus is large and distinct, the aperture cir- 

 cular, and marked below with rounded knobs. The 

 length of the shell is from half an inch to an inch. 



Chlorostoma Pfeifferi, Phil., Klo-ros'-to-ma fV-fer-i. 

 In shape the shell of this rare species resembles the 

 one shown in Fig. 64. It is conical, with whorls 

 perfectly flat ; the base is likewise flat and circular, 

 and the umbilicus is large. Its color is light brown ; 

 its length is sometimes more than an inch, and its 

 breadth is the same. 



In Fig. 69 we have the representation of a more 

 common Turban, or Chlorostoma, which name means 

 Green-mouth, and refers doubtless to the greenish 

 nacre within the aperture. 



This species is named Chlorosto- 

 ma brunneum, Phil., brun'-ne-um, 

 and we will call it the Brown Tur- 

 ban. When found alive, as it may 

 be, on the rocks at very low tide, or 

 on the kelp if you have a boat, 

 this mollusk has a handsome, rich 

 brown shell, with a portion of white around the 

 aperture. The base is flattened, the umbilicus is 

 closed, and the lines of growth are very oblique; 

 while the edge of the outer lip is very sharp. 



Even the dead and worn shells preserve their brown 



Fig. 69. 



