498 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Plate VIII. 



Fig. 49. Echinopluteus of Echinus esculentus, four weeks 

 old. After MacBride. 



Fig. 50. Echinopluteus of Echinus esculentus, three 

 weeks old. After MacBride. 



Fig. 51. Echinopluteus of Echinus miliaris three weeks 

 old. After MacBride. 



Fig. 52. Body of echinopluteus of Echinus miliaris, 

 viewed from the left side. 



Fig. 53. Ventral view of an ecliinopluteus of Echinus 

 miliaris. 



Fig. 54. An older ecliinopluteus of the same, viewed 

 from the left side. 



Fig. 55. Ventral view of a still older echinopluteus of 

 the same. 



Fig. 56. Metamorphosing echinopluteus of Echinus 

 miliaris, viewed from the left side. 



Plate IX. 



Fig. 57. Aboral view of a post-larva of Echinus miliaris. 



Fig. 58. Ventral view of a full-grown ecliinopluteus of 

 E chinocardium cor datum. 



Fig. 59. Side view of a post-larva of the same. 



Fig. 60. Oro-lateral view of a post-larva of the same. 

 The spines are omitted. 



Figs. 61 to 64. Four stages of an unidentified Spatangoid 

 echinopluteus. 



Fig. 65. Dorsal view of the echinopluteus of Echino- 

 cyamus pusillus. 



