AN UNDESCRIBED ACRANIATE. 247 



Figure 23. Transverse section of the caudal process near its 

 tip, (h) Fig. 4, showing existence of nerve cord and notochord, but 

 the absence of muscles. 



Figure 24. Skeleton of the pre-oral hood, somewhat flattened 

 out. From macerations in Haller's liquid. 



Figure 25. Optical, longitudinal section of the dorsal fin about 

 the region (g) Fig. 4. Incipient fin-ray spaces and radiating lymph 

 canals as seen in a preserved specimen stained by Bismarck brown 

 when alive. Some epidermal cells containing colored spherules are 

 shown at a higher focus. 



