206 WEST COAST SHELLS 



Lacuna variegata, Cpr., is the Striped Chink-shell. 

 The shell of this species is tall, effuse, and it has a 

 wide chink. In color it is clouded or has zigzag 

 stripes. It lives on the coast of British Columbia, 

 and it may be found on the green Zostera, or Eel- 

 grass. 



Fossarus {Isapis) ohtusus^ Cpr., the Obtuse Isapis, 

 has a roundish little shell, a quarter of an inch long 

 or less. The aperture is oval, and the outer lip is 

 diversified by shallow, spiral grooves. There is a 

 small umbilicus. The spire is small and few- 

 whorled, and the color is light brown. 



Fossarus {Isapis) /^/z^j/m/z/j, Cpr., the Windowed 

 Isapis, resembling the last species, but is marked 

 with sharp spiral ridges, about twelve of which may 

 be seen on the body- whorl. The outer lip is thin 

 and the umbilical chink is small. Its length is 8 mm. 

 and it is 7 mm. in breadth. 



l^runcatella Calif ornica^ Pfr., the California 

 Looping-snail, lives about salt marshes and upon 

 seaweeds and stones. The little cylindrical shell is 

 smooth, light brown in color, with a horny opercu- 

 lum, and is less than a quarter of an inch in length. 

 The surface is smooth, and there are distinct sutures 

 between the whorls. 



A far different shell is shown in 

 Figure 200, which gives us an inside 

 view of the tent-shaped shell of Cru- 

 cibulum spinosu?n^ Sby., the Cup and 

 Saucer Limpet. The saucer is more 

 or less deep, brownish in color, and 

 Fig. 200 set on the outside with numerous 



