98 



in 



ROBERT TRACY JACKSON ON ECHINI. 



m 



[_ Text-figs. 62-71. — Ocular plate arrangemept in Eucidaris tribuloiilcs (Lauuirck). 



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 in.sert, genital 3, plates X' , and genital 4, plat 

 split by secondary sutures. 



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



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



es X, are 

 variants. 



67. 

 68. 

 69. 

 70. 



71. The same specimen seen from interior. The genital has (inly one large madreporic ])ore, and the genit 

 larger than on the exterior. All figures X 3. 



R. T. J. Coll., 648. 

 R. T. J. Coll., 649. 

 R.T.J. Coll., 801. 

 R. T. J. Coll., 654. 



Oculars V, I, IV, II in.sert. 



All oculars insert. 

 Oculars V, I, IV, III insert. Figures 67-69 all ])rogressive 



Seen from exterior. The genital has many madreporic 



variants, 

 pores, 

 al i)ore is 



