PLATE XVIII. 



COPTOSOMA spEciosuM Clark (page 52). 



Fig. Irt. Upper surface of the test. 

 lb. Lateral ^ iew of the same. 



If. Upper portion of an iuterainbiilacral area, enlarged. 

 Id. Three plates of the same, highly maguitied. 

 le. Portion of ambnhicral area, highly magnified. 

 1/. Ditto. 



Ig. Tubercle of ambiilacral area. 

 1ft. Tubercle of iuterambulacral area. 



GoNioPYGUS ZiTTEM (Jlark (page 53). 



Fig. 2a. Lateral surface of the test. 



2b. Lower portion of ambulacral area, highly magnified. 

 2c. Portion of iuterambulacral area, highly magnified. 

 2d. Apical disk, enlarged. 

 140 



