ADDENDA ET CORRIGENDA. 



Page 262, line i, for "about one and a half as far" read "about one and a half to twice as far". 



Line 10, for "between the two pairs as 7 14" read "between the two pairs as 7 : 4 or as 3 : 2". 



Line 14, for "fingers i; total length 3,2; height 1,1" read "fingers i; total length 2,72 — 3,2; 



height 1,1". 

 Page 267, line 4 from bottom, for "the length being 2,42-times as long" read "the length, measured between 



the base and a line uniting the postero-lateral angles, being 2,42-times as long". 

 Page 270, line 3 from bottom, for "fingers i; total length 3,25; height i" read "fingers i; total length 2,7; 



height 0,9". 

 Page 272, line 10 from bottom, for "articulation" read "base". 



Page 332, line 9, for "namely one and a half as long" read "namely almost one and a half as long". 

 Page 346, line 7 from bottom, for "2,S-times" read "2,5- to 3-times". 

 Page 347, line 11 from bottom, for "3-times or almost 3-times" read "a little more than twice". 



Line 9 from bottom, for "obviously longer" read "about as long as, though not shorter". 

 Page 354, line 13, for "chela 0,8 mm. long (palm 0,3 mm., fingers 0,5 mm.)" read "chela 0,9 mm. long 



(palm 0,33 mm., fingers 0,57 mm.). 

 Page 358, line 11 from bottom, for "(0,8 mm.)" read "(0,85 mm.)". 



Line 7 from bottom, for "the posterior pair one and a half as far distant from the posterior 



margin as from the anterior pair" read "the posterior pair a little farther distant from the 



posterior margin than from the anterior pair". 

 Page 375, nearly in the middle, for "Dactylus of yi legs measuring two-fifths" read "Dactylus of 3rd legs 



measuring two-sevenths". 

 Page 382, line 13, for "the extremity unarmed" read "the extremity ending in a small tooth". 

 Page 384, line 13, for "one fourth longer than the visible part of the i^t" read "one fourth longer than 



the visible part of the pt, when measured along the inner margin". 



Line 14, for "one-fifth" read "two-fifths". 

 Page 398, line 4, for "3-times as long" read "3,5-times as long". 

 Page 412, line 9, for "but little longer" read "but little shorter". 

 Page 413, line 12 from bottom, for "telson one-fifth" read "telson one-third". 



