. Bulletin. Histoire naturelle ; Natuurlijke historie. 90 Peabody Museum Bulletin 42. moi Fig. 27. Un humérus gauche d'Ectoganus, YPM 27201. a) vue antérieure, b) vue postérieure. Abréviations : c  = condyle latéral ( = capitule) ; bl  = bicipital rainure ; dp  = crête deltopectoral ; ca entepicondylar supracondyloid foramen ( = foramen) ; TG  = grosse tubérosité ; H  = tête ; le  = epicondyle latéral ; C  = moindre ; tubérosité mc  = condyle médial ( =) trochlée ; me  = epicondyle médial ; o  = olecranon fossa ; pr  = pronator ridge ; Rs  = supinator ridge ; st  = supratrochlear poplité ; te  = teres eminence. L'échelle est 4 cm de long.

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. Bulletin. Natural history; Natuurlijke historie. 90 PEABODY MUSEUM BULLETIN 42. me Fig. 27. A left humerus of Ectoganus, YPM 27201. a) Anterior view, b) Posterior view. Abbreviations: c = lateral condyle (= capitulum); bl = bicipital groove; dp = deltopectoral crest; ef = entepicondylar foramen (= supracondyloid foramen); gt = greater tuberosity; h = head; le = lateral epicondyle; It = lesser tuberosity; mc = medial condyle (= trochlea); me = medial epicondyle; o = olecranon fossa; pr = pronator ridge; sr = supinator ridge; st = supratrochlear fossa; te = teres eminence. Scale is 4 cm long. Distally, the humerus is extremely broad with an enlarged medial epicondyle. Above this is a large, circular entepicondylar foramen which, as in Psittacothe- rium, is enclosed by a massive internal condyloid (pronator) ridge. The lateral epicondyle is also prominent, but not so large as the medial epicondyle. The supinator ridge is also well developed and slightly recurved anteriorly. Anterior- ly, there is a shallow supratrochlear fossa above the capitulum. Posteriorly, the olecranon fossa is relatively small, but deep. Mediolaterally, the trochlea is smoothly concave and the capitulum smoothly convex. The medial trochlear crest is moderately developed and extends slightly farther distally than the surface of the capitulum. Ulna Several partial ulnae are preserved, most notably in USNM 1001, FMNH P 26083 (PI. 34: figs. 3, 4) and USGS 3838 (PI. 46: fig. 9). Unfortunately, all of these ulnae are rather fragmentary and in none of them is the distal end pre- served. As in other taeniodont genera, the olecranon is large, rugose, extends far distally and is inflected slightly medially. The olecranon and shaft of the ulna are heavy, deep dorsoventrally but flattened (compressed) transversely. The shaft is most compressed along its length in the middle and is slightly wider dorsally and ventrally, such that it appears to bear external and internal grooves. The semilunar and radial not

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