According to textbooks of veterinary anatomy and mammalogy, the mammae of dogs are usually 10 or 8, or rarely 11 or 12 in number. However, it is difficult to distinguish the standard type of the mammary formula of the dog from those descriptions. Author studied embryologically and anatomically the mammary formula of the mongrel dog in postnatal stadium, using 49 cases of 9 new-borns and 40 adults, as a sum total. The results obtained are summarized as follows.
The mammary formula was classified into 3 types in new-horns and 9 types in adu lts in number respectively. In adult dogs the moststandard type was 1+2+1 =8 in about a 45% frequency. The mean value of the teat number was 8.888±0.025 in new-born and 8.150±0.037 in adults. The differences among those mean values, including 9.458±0.055 in canine fetuses, are statistically significant. From those results, it was found that there is a continuous change from the manymammae type of the dog in embryological stadium to the few-mammae type of the dog in postnatal stadium.
The degeneration or absence of teats occurred frequently in the anterior pectoral region of adult dogs.

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Recently I had an opportunity to examine a Tadarida specimen was collected in the temple of Angkor Wat, northern Cambodia on 25 August, 1964, by Dr. R. KANO. He kindly presented the specimen to the National Science Museum (Tokyo) . As this specimen was not fresh, it is preserved as a skeleton. Although the accurate identification is quitely impossible due to its a poor condition several skeletal characters indicate that it is probably Tadarida plicata plicata (BUCHANNAN, 1800) new to Cambodia.
Characters of the specimen: Complete premaxillary bones isolating two small incisive foramina by their palatal branches indicate that it belongs to the subgenus Chaerephon DOBSON, 1874. Sagittal crest and lambdoid crests evident, braincase is slightly elevated at anterior portion in dorsal profile. Zygomatic arches widest in posterior extremities. Width of mesopterygoid space about a half its length. Gap between anterior upper incisors about 1.5 mm.
HILL, 1961 recognized three species, nine subspecies in the subgenus Ciaerephon in the Indo-Australian region. This specimen agrees with seven characters of Tadarida plicata plicata, five of Tadarida plicata dilatata, three of Tadarida plicata insularis, Tadarida jobensis jobensis, and Tadarida jobensis colonicus among ten linear characters given by HILL.
This specimens is distinguished from Tadarida plicata tennis, Tadarida plicata luzonus and Tadarida jobensis solomonis, by its much larger dimentions and from T. johorensis by the rostrum not as flat as the latter. Therefore, this specimen seems to be most closely related to Tadarida plicata plicata.

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