94 VARIETIES. 



It is smaller and more abundant than the last 

 species. The back is quite smooth, marked only by 

 lines of growth. The spire is very short ; the holes 

 five to nine in number, and the color is greenish 

 black without, and pearly within. Live specimens, 

 varying in length from one-fourth of an inch up to 

 six inches, may be found at low tide, clinging to the 

 rocks, particularly in the most inaccessible cracks, 

 and under heavy boulders. 



When examined in a jar of sea-water, as all of 

 these animals should be if there is opportunity, a 

 living specimen presents many interesting points for 

 study, particularly its broad foot, its fringed and 

 sensitive mantle, its stalked eyes and slender ten- 

 tacles. 



Haliotis corriigata^ Gray, Hal-i-o'-tis cor-ru-ga'-ta. 



As its name indicates, this species has a roughened 

 or corrugated shell. In size and color it resembles 

 H. riifesceiis^ but its shell is nearly circular, thick, 

 high arched and corrugated. 



It has only two or three holes, but these are quite 

 large, and the central muscle impression is quite wide 

 and very brilliant. It is a southern species and is 

 usually found below the low- water mark. 



A variety of this species named assimilis^ Dall., 

 as-sim'-i-lis, is smaller, less roughened, has more 

 holes, and is marked by a furrow, running parallel 

 with the line of holes, and just below them. Deep 

 water specimens are sometimes found in the stomachs 

 of large fishes. There has been considerable discus- 

 sion concerning this variety, and some regard it as a 

 distinct species. Specimens of it are found further 

 north than the simple corrugata is known to have 

 been gathered. 



