494 
beneath. Apparently the nasal and premaxillary bones failed to develop, 
leaving the prefrontal bones exposed and rounded. 
8. This specimen represents a pair of chicks of about 60 hours 
incubation, the bodies are well developed at an angle of 180° to 
each other. Two hearts are present, but in the balsam mounted 
specimen it is impossible to determine whether there is one head or 
two heads due to overlapping of the specimens. 
9. This specimen of four-legged duck was presented by Dr. RosEn- 
BERGER. The specimen is apparently at full term. It presents an 

SS LCUNRK, 
Fig. 9. 

Fig. 8. 
Fig. 8. Kitten, at term, showing lumbar and pelvic duplication. Malfor- 
mations of cephalic extremity, shown in next figure. A is the rudimentary 
mandible with primitive oral pit in front, and open first branchial cleft behind. 
Fig. 9. Head of preceding kitten. This shows absence of mandible; @ is the 
rudimentary mandible with primitive oral pit in front, and open first branchial cleft 
behind, extending from each ear. The left orbital fossa is also malformed. . 
extra pair of lower extremities. The leg, tarsal and foot portions are 
as well developed as the normal extremities and all joints seem normal. 
A peculiar condition exists at the thigh; here there is but one bone 
