THE CRUSTACEA OF NEW JERSEY. 269 



beach of Saint Catherine's Island in Georgia. They concealed 

 themselves under raised bark, and in the deserted holes of 

 Teredo, etc., of such trees as are periodically immersed. 



This species suggests the "pill-bugs" in form as well as habits. 

 Verrill says it occurs in abundance under stones and rocks, or 

 creeping slowly about among the branches and roots of sea- 

 weeds, on their sides and upper surfaces, from low-water mark 

 nearly up to high-water mark. In color it is exceedingly variable, 

 for no two can be found alike. The colors consist of irregular 

 blotches and dashes of dark gray, light gray, slate, greenish 

 and white, so blended as to imitate very closely the colors of 

 the l>arnacles and gray surfaces of the rocks where they live. 

 When disturbed they curl themselves up into a ball and drop 

 to the bottom. 



My examples from Cape May. Mr. W. T. Davis reports he 

 found it at Center Island in Oyster Bay, Long Island, New York. 



Genus CASSIDISCA H. Richardson. 



Cassidisca H. Richardson, Bull. U. S. Nat. Mus., No. 54, 1905, p. 272. Type 

 Cassidina htnifrons H. Richardson, first species. 



Body oval, depressed. Abdomen of two segments, and first 

 segment formed by fusion of several segments. Inner branch 

 of uropoda large and well-developed, immovable and firml}- fixed 

 to side of abdomen. Outer branch of uropoda rudimentary, very 

 short, not entirely separated from inner branch, and sometimes 

 represented by small incision in exterior margin of inner branch. 

 Maxillipeds with second, third and fourth joints of palp not 

 produced into lobes. Legs all ambulatory. 



Cassidisca lunifrons (H. Richardson). 

 Plate 82. 



Cassidina lunifrons H. Richardson, Amer. Nat., XXXIV. 1900, p. 222. Great 

 Egg Harbor, New Jersey. 



H. Richardson. Proc. U. S. Nat. Mus., XXIII. 1901, p. 533, fig. 14 



(type). 



Paulmier, 58th Ann. Rep. N. Y. State Mus., IV, 1904 (1906), p. 174, 



fig. 45. Bartow and Fresh Kills, Staten Island, N. Y. 



Cassidisca lunifrons H. Richardson. Bull. U. S. Nat. Mus.. No. 54, 1905, p. 

 273, figs. 283-284 (type). 



