In general every effort has been made to replicate the original text as faithfully as possible, including some instances of non-standard spelling and punctuation. Certain animal names (notably, "Lobster", "Crab") have occasionally been changed from lowercase to capitalized when the pattern of capitalization used by the author has permitted the transcriber to judge that the omission of such capitalization was likely to be typographical in nature and not intentional. The hyphenation is occasionally variable; this has not been altered. A few obvious punctuation errors have been corrected, as well as the following apparently typographical errors:

p. ix (List of Illus.) "8. Diastylis goodsiri...," 8 changed to 18

p. xiv (List of Illus.) Plate II page reference, changed from 63 to 36

p. xv (List of Illus.) Plate XXI caption, Palamon changed to PalÆmon

p. xvi (List of Illus.) Plate XXVII caption, "The Coco Nut Crab, Birgus latro," Coco Nut changed to Coconut

p. 78 Fig 31 caption, "The adult of an allied species is figured on Plate XXV," XXV changed to XXIII

p. 165 "Daphnia pulex and other speces," speces changed to species

p. 169 "the addomen, however, is drawn out," addomen changed to abdomen

p. 196 Plate XXVII caption, "The Coco-nut crab, Birgus latro," Coco-nut changed to Coconut

p. 208 Plate labeled as XXVII (Group of Barnacles...) changed to XXVIII

p. 214 "a fleshy mass formed by a colony of Sea-amenones," amenones changed to anemones

p. 215 "woud be of little use by themselves," woud changed to would

p. 288 (index) missing italics placed on "Sapphirina"

p. 289 (index) tergum page reference 8 changed to 9

Some illustrations have been moved from their original locations to paragraph breaks, so as to be nearer to their corresponding text, and for ease of document navigation. Missing page numbers correspond to pages not numbered in the original document. References to scale in illustration captions are those of the original publication, and therefore do not correspond to the scale of the images in the HTML version of this ebook.