(c) the structure of the pectoral limb of the Asterolepidæ.
(4) The Dipneusti probably originated from more specialized Crossopterygii, e.g., from the neighborhood of the Holoptychiidæ.
(5) The Teleostei differ in so many respects from the Chondrostei that they should rank as an order, in which the Holostei are included.
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.
The Natural History of Plants