. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 282 Bulletin Museum of Comparative Zoology, Vol. 136, No. 8 20 15 •^ 10 THORACILIACUS ROSTRICEPS ^H CORDICEPHALUS GRACILIS |H| CORDICEPHALUS LONGICOSTATUS ||||||||. Overall Pelvis Column Skull Pectoral- Forelimb Hindlimb girdle Figure 16. Mean V, coefficient of variation, of the three Ramon species, for the whole skeleton, and for each skeletol system. scapulae show in 9 out of 78 cases, or per cent, of TJioiaciliactis; in 1 out of 11 in Cordiccphahis ii,mcilis, and in all of the three analyzable cases of C. ]oii
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 282 Bulletin Museum of Comparative Zoology, Vol. 136, No. 8 20 15 •^ 10 THORACILIACUS ROSTRICEPS ^H CORDICEPHALUS GRACILIS |H| CORDICEPHALUS LONGICOSTATUS ||||||||. Overall Pelvis Column Skull Pectoral- Forelimb Hindlimb girdle Figure 16. Mean V, coefficient of variation, of the three Ramon species, for the whole skeleton, and for each skeletol system. scapulae show in 9 out of 78 cases, or per cent, of TJioiaciliactis; in 1 out of 11 in Cordiccphahis ii,mcilis, and in all of the three analyzable cases of C. ]oiiii,icostatus (PI. 11 E). Pchic iiirdle (Figs. 11, 14, 15). The pelvic articulation is highly variable in The tips of the ilia make contact with ribs 3 and 4 (PI. 6 A) in 101 out of 243 cases, or per cent, and with only the 4th rib (Pi. 6 E) in another per cent, amounting to 83 per cent ilio- costal contact in all. In the remaining 17 per cent the ilia end freely at the level of presacrals 5, 6, and 7 (PI. 4). The great variation is reflected in the high V of pre- sacral ilium of (Table 3). lAmhs. The limbs display the least me- ristic and continuous xariation in the whole skeleton ( figs. 13, 16). In summary, is moic \ar- iable than Cord\cc])ha]us in both meristic and continuous variations (I'^igs. 14, 16). 44ie co(4ficient of variation (V) is in ThoruciUacus (average of 28 variates), versus in gracili.^, and in C. louii,icost(itus (av- erage of 25 and 24 variates respectively). The different skeletal systems \\ ithin a spe- cies display differential amounts of varia- tion. In all three species the pelvis is the most, the limbs are the least, variable. Other skeletal systems differ in order of decreasing amount of variations among the three species (Figure 16). DISCUSSION Relationships and Evolutionary Interpreta- tion of Ramon Frogs Ck'tu'ial. The characters listed in the os- t
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