Bulletin of the Museum of Comparative Zoology 



at harvard college. 



Vol. LII. No. 17. 



THE ECHIXODERMS OF PERU. 



Bv HnBERT Ltman Clark. 



With Fourteex Plates. 



CAMBRIDGE, MASS., U.S.A.: 



PRINTED FOR THE MUSEUM. 



October, 1910. 



