M. F. LINOER, DEL. 



Specimens from Spanish Wells. 



Figr. 1. DiADEMA SETOSUM (Gray), showiiitr natural disposition of spines. 



Fig-. 2. IsoPHYi.LiA nipSACEA. Dana. 



Fig. 2a. Nematocyst, showinjf coiled thread. 



Fig-. 2b. Nematocyst, showinfr thread partly e.xtruded. 



Fig-. 2r. Nematocyst, showing thread entirely extruded, 



Fig. 2i('. End of thread, showing- barb. 



