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24.

They are: a. gulo-humeral sulcus; b. humero-pectoral sulcus; c. pectoro-abdominal sulcus; d. abdomino-femural sulcus; e. femuro-annal sulcus; f. pectoro-axllary sulcus; and g. abdomino-inguinal sulcus.

Once the various parts are clearly defined, it is a easy matter to identify any fragment its position in the plate as a whole; as every part of the plastron is characterized by some individual characteristics either a particular form of the scute or the sulcus and edges.

In the first attempt of such a comparative study, seventy fragments from the 1928 collection can be definitely identified. Of these, 36 could be pieced together to form two hypothetical whole.

Fig. 15 

a.

[[image: hand-drawn diagram of a tortoise shell in red ink, with positions indicated by black arrows and labeled with black Chinese characters]]

b. 

[[image: hand-drawn diagram of a tortoise shell in red ink, with positions indicated by black arrows and labeled with black Chinese characters]]