194 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
An examination of the figures presented above shows that the vari- 
ous segments of the hinder limb of the bastard-turtle undergo little 
change in relative length during growth. 
It appears that all naturalists, who have had occasion to write of 
the sea-turtles of America, from the earliest times down to the time of 
Garman’s description of Colpochelys kempi, have confounded the 
species with the loggerhead, Caretta caretta. However, the ‘first 
author who figured a supposed loggerhead, after Linnwus had be- 
stowed the specific name, gave figures of the bastard-turtle. This was 
the German naturalist Schoepff. His figure of the plastron ¢ 
shows that there were present four inframarginals, a character be- 
traying the bastard-turtle. Holbrook’s figure?’ is that of the true 
loggerhead. 
_ The writer wishes to make note that on pages 8, 9, and 10 of his 
Fossil Turtles of North America, he has referred the bastard-turtle 
to the genus Lepidochelys. He was influenced to do this by Dr. 
George Baur, but there now appears to be no sufficient reasons for 
this disposition of the species. 
CARETTA REMIVAGA, new species. 
Plate XG ngs, 13 Plate xa hice: 
The supposed new species, Caretta remivaga, is based on a sxull 
which is in the U. S. National Museum and has the catalogue number 
9973. It 1s labeled as having been collected by Prof. F. Sumichrast, 
in Ventosa Bay, Mexico. The record shows that it was received by 
the museum in 1870. Ventosa Bay is on the western coast of Mexico, 
and is a part of the Gulf of Tehuantepec. 
This species, apparently, belongs to the genus Caretta, inasmuch as 
the skull has essentially the structure found in (C. caretta of the At- 
lantic Ocean. It differs from the latter species, however, in many 
important respects. The skull (Plate X) is flatter and the snout 
more pointed. The frontal bones enter the rim of the orbit. The 
maxille are widely separated by the vomer. The pterygoids possess 
conspicuous ectopterygoid processes. The free border of the ptery- 
goid, when followed backward, becomes a ridge which disappears 
before it reaches the pedicel of the quadrate; while the ridge which 
ascends from the inner end of the articulation for the lower jaw 
passes forward and upward to join a ridge which ascends on the 
descending plate of the parietal. The occipital condyle stands dis- 
tinctly behind the pedicels of the quadrates. Also the prootic bones 
project but little in front of the pedicels. The horny scutes overlying 
the occiput are much different from those of Caretta caretta, especially 
¢ Historia Testudinum, pl. xvi, lower figure. 
oN. Amer. Herpetology, II, 1842, pl. tv. 
