ERRATA.

P. 31, line 6 from bottom: delete “human,” as Leidy really worked with Endamœba blattæ, parasitic in the gut of the cockroach.

P. 43, line 12 from bottom: for “John’s” read “Johns.”

P. 44, line 13 from bottom: forAmœba buccalis, Sternberg,” readAmœba buccalis, Steinberg.”

P. 46, line 13 from top: for “breath” read “breadth.”

P. 53, In footnote 1, line 6 from bottom: insert “see” before Arch. f. Protistenk.

P. 75: To paragraph regarding development of the parasite in the fly’s salivary glands, add that the crithidial phase takes two to five days.

P. 111, line 8 from top: the date of Sangiorgi should be 1911.

P. 142, line 7 from top: insert “Genus.” before Eimeria.