-in the private collection of Mr. Leeds in Peterborough, 
840 | General Notes. i: 
_ The fin of Baptanodon was developed by the trans-locationt 
the pisiforme or another element of a new-formed ray oe 
Just the same we observe in the Sauropterygia. J 
In the oldest Triassic forms, the Lariosauridæ, we 
Baptanodon. ; a 
The Cetacean paddle has developed in the same way as hye 
has suggested; a new proof is given by the Sirenide. 
me a manus of Manatus americ., prepared in alcohol, rigs 
tained a fourth small ossified phalange in the third digit, a 
of Halicore dugong which contained an ossified fourth pha 
at the fourth, and a cartilaginous fourth in the third digit 
This shows how the supernumerary phalanges po 
oped, and it is remarkable to say that the enh ges. 
examined by Leboucq contained only three phi ual th 
increase takes place during the life of the individua! * 
mechanical influence. ia were * 
I do not longer doubt that the Ichthyopterysi4 ro 
veloped from land-living reptiles which very much ; 
the Sphenodontidz. . d ulna : 
Classification of the Ichthyopterygia.—a. Radius p two f 
gated, separated by a space in the middle. Bigs” i 
but not so numerous as in the Ichthyosauride. 9M4 © 
Family Mirosauride Baur. 
Genus Mixosaurus Baur. ‘ 
b. Radius and ulna short bones, touchi 
he ay ge and numerous. 
amily /chthyosauride Bonaparte. wevet, 
Genus Ichthyosaurus Koenig. There are, jas fread 
genera contained in Ichthyosaurus, as Seeley . 
ge 0 ; j ‘i ith the hw 
c. Radius, ulna, and a third bone articulating W! 
jra n nian: or absent." i 
amuy Daptanodontide Marsh. Haven, 
Genus Baptanodon Marsh.—Dr. G. Baur, New ae 
z I have seen small teeth at the end of the jaws of bn England. : 
ng each other. 
