8 



PANAMIC DEEP SEA ECHINI 



10 mm. 

 Fid. 26. DOROCIDARIS PANAMENSIS. 



The rudimentary interambulacral plates always make their appearance 

 against the face of the adjoining ocular (PI. 3, fig. <?), while the new 

 ambulacra! plates are formed between the ocular plate and the last 



18 mm. 



Fig. 27. Dorocipaeis panamensis. 



