No. 1605. ON THREE SPECIES OF SEA-TURTLES—HAY. 1938 
from the snout to the occipital condyle is 232 mm. It came from 
Swan Island, in the Caribbean Sea. The next largest is in the Amer- 
ican Museum of Natural History, New York, and was found on the 
coast of New Jersey. The length from the snout to the occipital 
condyle is 230 mm. Neither of these specimens is accompanied by 
the shell. 
The shoulder girdle and the fore limb of the bastard-turtle are 
not greatiy different from the same structure in the loggerhead. It 
is found, however, that the distal end of the coracoid of the bastard- 
turtle is distinctly broader than that of the loggerhead, the breadth 
being in the former 0.43 of the length, in the latter 0.32. 
The following table presents the length of the whole fore limb and 
of various parts of it in two specimens each of the bastard-turtle and 
of the loggerhead. 
Measurements of the fore linvb. 
ee ee ee See 2 Dee ae oe SEBe. ae 
| Colpochelys kempi. Caretta caretta. 
Measurements. aaa yr ois = ; | 
| No. 29323. | No. 29015. | No. 15259. | No. 29872. 
| pee ae Se aE | Faas 
Whole limb from head of humerus to end of | mm. mm. mm. mm. 
CEG GT it Ree nee oa a ene Fein atin ee 467 214 352 344 
Humerus from head to radial articulation____ 136 60 105 100 
Pc COQ ON es ag AR ie pe at ae ee 78 33 52 52 
Carpus from ulna to base of third digit______- 47 22, 35 32 
“AM ibeGl Ohyont a= See ee ee eee | 206 99 160 160 
L 
Judging from the figures presented, the humerus and the ulna of 
the young of the bastard-turtle are shorter in comparison with the 
whole limb than in the adult; while the third digit is longer. The 
head of the humerus of the bastard-turtle is more flattened in section 
than is that of the loggerhead, the short axis being nearly 0.6 that of 
the longer, while in the loggerhead the short axis is 0.8 the length of 
the longer. 
In the bastard-turtle the thumb and the fifth digit are relatively 
slightly longer than those of the loggerhead. In the former the 
ungual phalanx is more acuminate in outline. 
The pelves of the two species are greatly alike. However, the 
ischiopubic foramen of the bastard-turtle is more pointed in front, 
being thus more heart-shaped. 
Measurements of the hinder limb. 
y Ze 1 
Colpochelys kempi. Caretta caretta. | 
Measurements. ; | 
No. 29328. | No. 29015. | No. 15259. | No. 29372. | 
if | 
| mm. mm. mm. mm. | 
Length of whole limb to tip of third digit____. | 416 153 262 246 | 
GEIS Ginko te fe mnie yn eee ee ee ae ae ee ee 141 50 90 81 
ILBAZWa Ore HO Se ee ee ee 105 39 57 56 
Length of tarsus to base of third digit_______- 33 11 20 18 |} 
IDV OE WAG! CON Faerie oe 127 53 95 91 | 
Proce Ne Ma vole xxxiv—08—113 
