BARBADOS-ANTIGUA REPORTS 31 



A New Classificatiox of the Ophiuroidea. Hikoshiehiro 

 I\Iatsumoto. Proceedings of the Academy of Natural Sciences, 

 Pliiladelphia. 1915 u-^pril 12. 1915). pp. 4:3-92. 



Catalogue of Recent Ophiuraxs : based upon the collection of 

 the Museum of Comparative Zoology. Hubert Lyman Clark. 

 Memoirs of the Museum of Comparative Zoology, vol. 25, No. 

 4, December, 1915. pp. 165-376, plates 1-20. 



A Monograph of Japanese Ophiuroidea, arranged according to 

 a new Classification. Hikoshiehiro ^Matsumoto. Journal of 

 the College of Science, Imperial University of Tokyo, vol. 38, 

 Art. 2, March 31. 1917, pp. 1-408, plates 1-7. 



Ophiures [collected by Kiikenthal and Hartmeyer in the West 

 Indies, a number at Barbados] . Rene Koehler. Zoologischer 

 Jahrbuch, Supplement 11, Heft 3, 1913, pp. 351-380, plates 

 20, 21. 



THE CARIBBEAN ECHINODERM FAUNA 



On the basis of the available data it is difficult to make any 

 statements of value regarding the subdivisions of the echinoderm 

 fauna of the American side of the tropical Atlantic. There is a 

 certain homogeneity about it which suggests that it should be 

 regarded as a single faunal unit locally modified, as a result of 

 diverse ecological conditions, by the partial or complete elimina- 

 tion of certain types which results in local changes in the faunal 

 balance; that is to say, the faunal characteristics of any given 

 region are more closely dependent upon the size and character 

 of the adjacent land mass (features determining the amount and 

 kind of food ' than they are upon fundamental faunal consid- 

 erations. 



The Brazilian section of this fauna includes several character- 

 istic types not known elsewhere in the region. Perhaps the most 

 striking of these is Paracentrotus gaimardi, which also occurs in 

 west Africa. This species appears to be rare and local and it is 

 not by any means certain that it does not occur in the next 

 section. 



The fauna of the continental shores of the Caribbean region, 

 with Trinidad and Tobago, seems, so far as we can tell, to be 



