. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 274 Bulletin Museum of Comparative Zoology, Vol. 136, No. 8. 1 cm Figure 9. Cord/cepho/us longicoslatus, reconstruction. lliroiighout its length. The capitate emi- nence is well developed. The radioulna is relatively long, having a well-developed olecranon process (Pi. 11 (>). There are nine carpals and fonr snbec^ual fingers involving very long metacarpals, as in C'. gracilis. In no specimens were the plia- langes entirely preserved; the phalangeal formnla is thns indeterminable. The termi- nal phalanges are point
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 274 Bulletin Museum of Comparative Zoology, Vol. 136, No. 8. 1 cm Figure 9. Cord/cepho/us longicoslatus, reconstruction. lliroiighout its length. The capitate emi- nence is well developed. The radioulna is relatively long, having a well-developed olecranon process (Pi. 11 (>). There are nine carpals and fonr snbec^ual fingers involving very long metacarpals, as in C'. gracilis. In no specimens were the plia- langes entirely preserved; the phalangeal formnla is thns indeterminable. The termi- nal phalanges are pointed. The femnr is laintK sigmoid in sliape, greatly expanded at both ends, being slightl)- larger than the tibiofibnla; the latter is grooved through- out. The tibiale and fibulare are relativeU' long. The five metatarsals are very long; the terminal phalanges are ]")()inted. OSTEOLOGICAL SUMMARY The tollowiiig list summarizes for each skeletal system the cliiiracters common to all three species, and also the skull, ix'lvis, and tarsal features distinguishing C'ordi- cc'phdhis from llidKicitidcus. (Shape dil- ferences between the two genera are not repeated. See Tables 6 and 7 for qualita- tive differences in skull and pelvis, Tables 4 and 5 for quantitative differences be- tween Covdiccphalus and TJiordciUacus.) SKULL (Fig. 10) 1) Skull well ossified, broader than long. 2) Frontoparietals large, vase-shaped, a/.ygous. .3) Premaxillae and maxillae dentiger- ous. 4) Maxillary arcade incomplete. 5) Otic capsules extensive. 6) Plectrum of columella well ossified and developed, slightly curved rod. 7) Pterygoids extensive, with a long anterior extension. S) Parasphenoid sword-like, having only short basal processes. 9) Sphenethmoid single, pointed an- teriorly. 10) \'omers paired and edentulous. 11) Quadrate subquadrangular and well ossified. 12) Nasals well developed, medium to broad in shape, forming a promi- nent rostrum onh' in Thoraciliaciis. 13 ) Squamosals reduced. 14) Q
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