HI 



ROBERT TRACY JACKSON ON ECHINI. 

 I 



TEXT-FIGS. 62-71. Ocular plate arrangement in Eucidaris trilmlinilcs (I.amarck). 



62. Jamaica. Diam. 38 mm. R. T. J. Coll., 798. All oculars exsert. 



63. Jamaica. Diam. 33 mm. R. T. J. Coll., 799. Ocular V insert. 



64. Jamaica. Diam. 35 mm. R. T. J. Coll., 800. Ocular I insert, genital 3, plates X' , and genital 4, plates X, are 

 split by secondary sutures. 



65. Nassau, Bahamas. Diam. 32 mm. R. T. J. Coll., 646. Oculars V, I insert. Figures 62-65 all arrested variants. 

 Nassau. Diam. 47 mm. R. T. J. Coll., 647. Oculars V, I, IV insert, the typical character. 



R. T. J. Coll., 648. Oculars V, I, IV, II insert. 

 All oculars insert. 



66. 

 67. 

 68. 

 69. 

 70. 



Nassau. 

 Nassau. 



Diam. 52 mm. 



Diarn. 40 mm. R. T. J. Coll., 649. 



Jamaica. Diam. 35 mm. R. T. J. Coll. ,801. Oculars V, I, IV, III insert. Figures 67-69 all progressive variants. 

 Nassau. Diam. 47 mm. R. T. J. Coll., 654. Seen from exterior. The genital has many madreporic pores. 



71. The same specimen seen from interior. The genital has only one large madreporic pore, and the genital pore is 

 larger than on the exterior. All figures X 3. 



