Fig. 1. Development of the dentition in Rhynchocyon stuhhnanni claudi 

 Thomas. All X%; a and b, side views; c and d, crown views. From specimens taken 

 in the Belgian Congo by The American Museum of Natural History Congo Expe- 

 dition, 1909-1915. 



Stage 1. Milk teeth breaking through gums. No. 49518, 9 juv., Medje, June 3, 1914. 



Stage 2. Milk teeth more advanced; alveolus of p 1 fissured. No. 49437, 9 juv., Medje, Septem- 

 ber 8, 1910. 



Stage 3. Milk teeth fully developed, and p 1 nearly so; convex diastema where pi is forming be- 

 neath. No. 49513, cf juv., Niapu, December 17, 1913. 



Stage 4. Upper milk dentition p 1 , and crown of m 1 just through gum; lower jaw: milk teeth, pi 

 well advanced, mi half up, and tip of permanent ii in sight. No. 49498, 9 juv., Niapu, December 6, 

 1913. 



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