FOOTNOTES:
[164] This group has been usually known as Dipnoi, a name chosen by Johannes Müller in 1845. But the latter term was first taken by Leuckart in 1821 as a name for Amphibians before any of the living Dipneusti were known. We therefore follow Boulenger in the use of the name Dipneusti, suggested by Hæckel in 1866. The name Dipnoan may, however, be retained as a vernacular equivalent of Dipneusti.
[165] The yolk appears to be contained in the digestive cavity, as in Ichthyophis and lamprey.
[166] The abbreviated mode of development of the fins is most interesting; from the earliest stage they assume outwardly the archipterygial form; the retarded development of the limbs seems curiously amphibian-like; the pectorals do not properly appear until about the third week, the ventrals not until after the tenth.
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Transcriber's Notes:
Simple spelling, grammar, and typographical errors were corrected.
Punctuation normalized.
Anachronistic and non-standard spellings retained as printed.
The ERRATA on p. [ix] has been corrected in the text.
P. xxiii corrected "Salmo gairdneri, the Steelhead Trout. [326]" to "Salmo irideus, the Rainbow Trout. [326]" to agree with the actual illustration caption.
P. xxiii corrected "Salmo rivularis, the Steelhead Trout. [327]" to "Salmo gairdneri, the Steelhead Trout. [327]" to agree with the actual illustration caption.