PANAMIC AND WEST INDIAN ECHINID FAUNA. 227 



from the Oceanic Series of Barbados, Archeopnciisies ahrupius ' and Cyst- 

 echimis crassus? 



From the list of the species found in the East Indian Archipelago, given 

 by M. de Meijere, and by the "Valdivia" in the Indian Ocean, we have 

 collated the genera or their representatives which had not thus far been 

 noticed to extend over the Indo-Pacific realm. From the Echinoidea 

 of the " Valdivia " and '^ Siboga " Expeditions and other sources we may 

 add the following genera which have not been recorded before as ex- 

 tending from the Panamic to the East Indian realm : Phormosoma, Salenia, 

 Aspidodiadema, Dermatodiadema, Neolampas, Homolampas, Phrissocystis 

 and Moira. 



The number of Clypeastroids collected from shallow water by the 

 " Siboga " Expedition is remarkable. With the exception of the species of 

 Echinocyamus and Fibularia, the first of which extends to 1886 metres 

 and the last to 522 metres, the Clypeastroids range from littoral to 350 

 metres, the majority to less than 200 metres. 



I have before called attention to the absence of Clypeasteridae in the 

 deeper waters of the West Indian area and off the southern coasts of the 

 United States, where Clypeastroids are common littoral forms. The same 

 is the case in the Gulf of California and off the Pacific Mexican and Central 

 American coasts. 



The " Blake " dredged Echinocyamus to a depth of 850 fathoms, and 

 the "Challenger" obtained Fibularia to a depth of 950 fathoms. This 

 agrees with the deeper range of these genera in the East India Islands. 



1 Q. J. Geol. Soc. London, 1892, Vol. XL VIII, p. 163. 



2 Id. 1889, Vol. XLV. p. 640. 



