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52 SMITHSONIAN CONTRIBUTIONS TO PALEOBIOLOGY 40-i 5* 30 I 20 f 1. 30 i 52 Humeri 54 56 58 60 Length mm Ulnae 1 111 52 54 56 58 60 Length mm Carpometacarpi 62 15 10 f 5 15-i 10 4> 3 Sf 5 Femora Length mm Tibiotarsi .Mil. 45 47 49 51 53 Length mm Tarsometatarsi l.llllll 30 31 32 33 34 35 36 Length mm Length mm FIGURE 10.—Histograms of lengths of Pachyptila macgillivrayi bones from Amsterdam Island. sons. Adult cranial and long bones of the Amsterdam prion were compared with those of the Broad-billed Prion {Pachyptila vittata) and Salvin's Prion (P. salvini) from the New Zealand region (Table 5; Appendix 3). The Amsterdam species is significantly smaller than P. vittata {t test, P

NUMBER 89 TABLE 5.—A comparison of the significance of the difference between means of various measurements for the Amsterdam Island prion and for Pachyptila vittata and P. salvini by /-tests (Microsoft Excel, ver. 5), assuming unequal variances. Shown are /-statistic, degrees of freedom, and significance level (P>0.05=NS, P

NUMBER 89<br />

TABLE 5.—A comparison of the significance of the difference between means<br />

of various measurements for the Amsterdam Island prion and for Pachyptila<br />

vittata and P. salvini by /-tests (Microsoft Excel, ver. 5), assuming unequal<br />

variances. Shown are /-statistic, degrees of freedom, and significance level<br />

(P>0.05=NS, P

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