i88 



AMIANTIS. 



and strong lateral ones. The common length of the 

 shell is two or three inches, but sometimes it is much 

 more. It is found on the southern coast. 



Fig. 160. 



Standella nasnta, Conr., na-su'-ta. Very similar 

 to the next species, of which it is perhaps only a vari- 

 ety; shell somewhat depressed behind the beaks. 

 An inch or more in length. 



Standella plannlata, Conr., plan-u-la'-ta, is shown 

 in Fig. 161. 



Its shape is much like 

 that of the last, but it is 

 only half as long. The 

 beaks are nearly equidis- 

 tant from the ends of the 

 shell, and the triangular 

 hinge-tooth is in front of 

 found in southern 



Fig. 161. 



the ligament. Its color is white: 

 waters. 



Standella falcata, Gld., fal-ka' 

 Fig. 161, but smaller and natter, 

 an inch long; northern. 



ta. Shaped like 

 Glossy; less than 



