BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
DESCRIPTION OF PLATES. 
The Arabic numerals indicate the serial number of the vertebrae, the Roman 
numerals the serial number of the ventral branch of the spinal nerves. 
ABBREVIATIONS. 
br. Nervus brachialis. il-Wga. Nervus ileohypogastricus. 
eru. Nervus cruralis isch, Nervus ischiadicus. 
est. scr. Sacral rib. pre.t. Transverse process. 
cst. scr’, Supernumerary sacral rib. su'crac, Nervus supracoracoideus. 
úl, Ilium. 
All the diagrams are drawn to natural scale of a full grown individual, and 
are viewed from ventral aspect. The sizeof nerves is drawn to scale roughly for 
the average condition. 
