ADDENDA ET CORRIGENDA. 

 Part I. 



Page 11. After the 16th line from the top add 1885, J. M. Clarke. The Higher Devonian 

 Fauna of Ontario County, New York, pp. 43, 44. 



Pages 16 and 19. PI. IV, fig. 3, is Ceratiocaris tyrannus (not C. Murchisoni) . 



Pages 20 and 21. PI. VI, fig. 11, is Ceratiocaris tyrannus (not C. valida). 



Page 23. Before the 10th line from the bottom add: — A specimen of C. tyrannus from tbe 

 Upper Coldwell beds, near Troutbeck, Westmoreland, is in Professor Tornquist's collection, Lund. 



Page 25. In the last two paragraphs lines 2nd and 5th from the bottom may refer to Ceratio- 

 caris tyrannus rather than to C. gigas or C. Murchisoni. 



Page 37. Add to the foot-uote— and ' Mem. Geo!. Surv.,' Explan. Sheet 23 (1879), pp. 9, <&c. 



Page 44. The 4th paragraph from the bottom refers to Ceratiocaris patula (not to C. robusta). 



Page 45. In the paragraph of lines 10 to 6 from the bottom, for telson read style. 



Pages 61 and 72. Plate XI, fig. 16, may belong to the genus Elymocaris, Beecher, as suggested 

 at p. 62. 



Pages 62 and 72. Ceratiocaris ? lata belongs most probably to Hymenocaris. 



We have to add that in the Lee Collection, British Museum, there are — 



I, 1163. From the Upper Ludlow beds of Logan Water, portions of the tail-pieces of Ceratio- 

 caris papilio. 



I, 1169. From the Lower Ludlow of Leintwardine, near Ludlow, the end of an abdomen, 

 telsou, and cercopods of C. papilio. 



I, 1167. From the Lower Ludlow of Church Hill, Leintwardine, the inside exposure of a left- 

 hand valve of C. Halliana. 



I, 1170. From the same locality a nearly perfect specimen of C. Halliana, young. 



I, 1168. From the Lower Ludlow beds, Ludlow — C. cassia 



