Plate 138. 

 1-3. Clypeaster lytopetalus A. Ag. & CI. 



1. Ahactinal vk'w of partly denuded test of specimen (holotype) from Hawaii, St. 39G2. 



2. Aetinal view of same. 



3. Left-side view of same. 



4. Clypeaster humilis (Leske). 



4. Aetinal view of same specimen as that shown in fig. 1, PI. 137. 



5. Clypeaster japonicus Dod. 



5. Left-side view of partly denuded test of unusually high specimen from Sagami Sea, 



Japan. 



All figures, natural size. 



