作者：杨钟健

摘要：In early 1973 Dr. Mendrez of France has kindly sent to me her recent publication concerning Regisaurus jacobi and suggested in her letter that the original of Urumchia lii described in 1952 may be further prepared and studied. It is rightly done by our experienced technicians as shown in plates I and II. The following supplementary notes may be given below:
    The ventral view of the anterior part of the skull:(See Plate I and Text-figures)
    In comparison of the Chinese specimen with Regisaurus jacobi, the following differences may be clearly remarked:
    1.  Our specimen is larger than the South African one in about 1/3 to 1 /4.
    2.  There is no sagital crests between the premaxillaries
    3.  The foramen between the same bones (fo. pmx. v. of Mendrez) small.
    4.  The foramen near the canine (f. c. i. of Mendrez) is comparatively larger.
    5.  The ventral ridge of the vomer is especially remarkable.
    6.  Internal narial foramen is large.
    7.  The symphysis between the lower jaws is 29 mm.
    8 .  The shelter at the inner part of the tooth row is rather distinct.
    9.  The rugusity structure of the surface of the upper and lower jaws is clearly notable.
    10.  Dentition: Upper: Before the canine, 7; behind the canine about 10; Lover: Before the canine 6; behind the canine about 13. 

    According to Mendrez in 1972 p. 992, the measurements of Regisaurus and the Sinkiang specimen are given as follows:
                                                                                    Urumchia    Regisaurus
Minimum breadth between the orbits…………………………    29.2         17
Distance from the anterior part of the
premaxillaries to the anterior border
of the orbits……………………………………………………………     63          59
The same to the anterior border of the
temporal opening……………………………………………………     38          8.5
Maximum breadth snout……………………………………………    33.2       27
Height at the same point…………………………………………     30.2        24
Length of the upper tooth row…………………………………    ?40          57
Length of the lower tooth row……………………………………  ?46         —

    It is obvious from the above given mesurements, the Chinese specimen is larger than the Sounth African one. There are also some differences between their structures. The number of the dentitions are also different. There is no nay doubt that the both forms belong to different genus.
    Nevertheless, the two forms are the members of therocephalia are clear.
    The age of Urumhia. As stated in earlier paper, the enact locality of Urumchia is not certain. But according to the studies in the recent years, both sides of the Tienshari Range, the Upper Permian faunas are richly-developed. It is very clean that the horizon of Urumachia belongs also to the Upper Permian.
The South African specimen, according to the description, is Lower Triassic, the Lystrosaurus-zone, that is higher than the Chinese one. Whether there is any relationship between the both is difficult to say at present. Further work both is the field and in the laboratory is obviously necessary.
    In the recent years, there are many indications of the continental deposits in various parts of China, especially Shansi and Honan. It is very promising to research those interesting problems in the future.
    For the references, see the end of the Chinese text.

卷期：11卷 02期

相关附件下载：关于乌鲁木齐兽的补充研究