16 EMBRYOLOGICAL MONOGKAPHS. 



31. OKliT ophiiiraii soon from tlie actiiial side ; I', t^, ('-, P, tcniiii)al, ami first, second, and tliird pairs of ten- 



tjicles. 



32. Free oiiliiuraii witliout Pluteaii appendages, fislied up from the surface, i-u'" in diameter. Seen from the 



dorsal side. 

 The stages 27-31 all have the two long amis intact ; the other shorter arms are iu different stages of 

 resorption ; sec figs. 27, 28, 30. The long arms are not figured for want of space. 



33. A single arm of fig. 32, from the abactinal side. 



34. The central part of the disk with a portion of the arm of the same from the actinal side, showing the teeth and 



the mouth papilke. Neither Jliiller nor Metschnikofl' was able to determine the ophiuran which is devel- 

 oped from PliUeus limaculatus. Miiller considered it at first to he OjyJiioIcpis sqimmata. 



