326 MEMOIRS OF THE CARNEGIE MUSEUM. 
surface at its extremity and below the head slightly convex, but about the middle 
flat, or slightly concave. At its distal extremity the rib curves backward. 
MeAsuREMENTS (No. 1604). 
Mm 
Length of fifth right rib. Measured in a straight line..................... 622 
Diameter of upper portion including head...................e0eceeeceees 85 
Greatest diameter of shaft near the middle........................--+--- 39 
Createstidiametenonshattmesicen Gere eerie tase erase eee 49 
The Sixth Rib. 
The sixth rib in its general outlines is similar to the fifth rib; the neck sup- 
porting the capitulum is, however, somewhat longer and the angle beyond the 
tuberculum somewhat more pronounced. The rib is longer than its predecessor, 
and is the most massive rib of the series. 
MEASUREMENTS (No. 1604). 
Mm 
Length of sixth right rib. Measured in a straight line.................... 648 
Diameter of upper portion including head................ 0000. e cece ee eee 86 
Greatest diameter of shaft near the middle.....................0.0000ee- 39 
Greatestidiameter of shattmeanend ss sens see ace eeesn eee neater 62 
The Seventh Rib. 
The seventh rib only slightly exceeds the sixth rib in length; it corresponds 
with it in form, the neck supporting the capitulum is, however, considerably 
shorter and the angle appears at a point somewhat further removed distally from 
the capitulum than in its predecessor. The antero-posterior diameter of the rib 
at its extremity is less than that of the sixth rib. 
MeEAsuREMENTsS (No. 1604). 
Mm. 
Length of seventh right rib. Measured in a straight line................. . 656 
Diameter of upper portion including head...................2.-eeeeeeees 93 
Greatest diameter of shaft near the middle.....................20+---ee- 43 
Greatestidiameter of shafigneanendaesereE nner enn eer aereerererrios 61 
The Eighth Rib. 
The eighth rib is the longest rib of the series; its antero-posterior diameter 
at its extremity is considerably less than that of the ribs preceding it; the angle is 
further advanced distally than in its predecessor. The neck supporting the 
capitulum is of about the same length as in the seventh rib. 
