MUSEUM OF COMPARATIVE ZOOLOGY. 



33 



one specimens from Maine. A new genus of brittle-stars was 

 obtained by exchange with the Zoological museum, Copenhagen, 

 and very desirable series of starfishes and brittle-stars were re- 

 ceived in exchange from the Zoological museum, Amsterdam, 

 and the Indian museum, Calcutta. These two exchanges added 

 ten genera and fifty-three species to the collections. 



The catalogue of holothurians is not yet complete but the other 

 four classes stood as follows at the close of the Museum vear. 



Genera. Species. 



Specimens. 



Crinoids 31 119 

 Asteroids * 102 440 

 Ophiuroids 107 738 

 Echinoids 122 418 



1581 

 11156 • 

 19155 

 15449 



362 



1715 



47341 



Publications. August 1, 1910- July 31, 1911. 



A new ophiuran from the West Indies. Proc. U. S. nat mus., 4 



August, 1910, vol. 37, p 665-666. 

 The echinoderms of Peru. Bull. M. C. Z., October, 1910, vol. 52„ 



p. 319-358, 14 pis. 

 The development of an apodous holothurian (Chiridota rotifer a). 



Journ. exp. zool, November, 1910, vol. 9, p. 497-516, 2 pis. 

 North Pacific ophiurans in the collection of the United States national 



museum. Bull. 75, U. S. nat. mus., February, 1911, p. i-xvi, 



1-302. 

 The genera of recent clypeastroids. Ann. mag. nat. hist., June, 191I y 



ser. 8, vol. 7, p. 593-605. 



