104 SEA-WEED LIMPETS. 



Nacella paleacea, Gld., pal-e-a'-se-a. This shell 

 resembles the last one, but is still narrower. It is 

 brownish, without stripes, and is one-fourth of an 

 inch in length. Nacella triangtdaris, Cpr., is proba- 

 bly a variety of the last. 



Now we will turn to a droll lot of creatures, whose 

 bodies resemble the Limpets, but whose shells are 

 decidedly peculiar. 



