. Bulletin - United States National Museum. Science. FORT UXIOX OF CRAZY MOUXTAUST FIELD, MONT. 169 case P. rex (Gidley) has long priority. If, however, all the material described above belongs to P. rex, it is almost surely distinct from P. anceps, and even if this is not the case it is not certain from the types that they are the same. In any event it is preferable to retain the name P. anceps for the present, as it is a well-lmown and well- characterized species, whereas P. rex is as yet very poorly known and its specific characters are not really established. The difference in stratigraphi
. Bulletin - United States National Museum. Science. FORT UXIOX OF CRAZY MOUXTAUST FIELD, MONT. 169 case P. rex (Gidley) has long priority. If, however, all the material described above belongs to P. rex, it is almost surely distinct from P. anceps, and even if this is not the case it is not certain from the types that they are the same. In any event it is preferable to retain the name P. anceps for the present, as it is a well-lmown and well- characterized species, whereas P. rex is as yet very poorly known and its specific characters are not really established. The difference in stratigraphic level between the horizons of the two types is nearly a thousand feet. Order TAENIODONTA Cope, 1876 Family STYLINODONTIDAE Marsh, 1875 Matthew (Pale. Mem.) is followed in referring all taeniodonts to a single family (with four subfamilies). This is an extremely rare group in this fauna, with only four specimens in the National Museum collection. Subfamily Conoryctinae Matthew, 1937 (Conoryctidae Wortman, 1896) Genus CONORYCTES Cope, 1881 CONORYCTES COMMA Cope, 1881 Figure 34. Figure ^i.— Conoryctes comma Cope, no. 9597, upper molar: a, External view; b, crown view. Natural size. Wortmann and Matthew recognized only one species of Conoryctes in the Torrejon, and as far as I know none has ever been described from any other formation. no. 9597, an isolated upper molar from the Gidley Quarry; no. 9678, isolated P^ from the Silberhng Quarry; and no. 9816, two upper molars from Loc. 6, seem to be in- distinguishable from Torrejon specimens. No. 9826, from Loc. 28, a higher level, may belong to Conoryctes but is not determinable. Subfamily Psittacotheriinae Matthew, 1937" Genus PSITTACOTHERIUM Cope, 1882 PSITTACOTHERIUM MULTIFRAGUM Cope, 1S82 Douglass (1908, p. 22) recorded a Calamodon in the Fort Union, querying the generic reference. Matthew (1914, p. 390) commented on Douglass' pubUshed data that this material "agrees better with
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