Plate 60. 

 1-3. Plexechinus cinctus A. Ag. ; Station 3424. 



1. Abactinal part of the test of specimen measuring 20 mm. in length, the same as 



fig. 2. 



2. Abactinal pai't of the test of another specimen (fragment) about 20 mm. in " 



seen from the interior. 



3. Abactinal plates of the odd ambulacrum ; same as fig. 2, somewhat more eulargei 



4, 5. Ur echinus Naxesianus A. Ag. 



4. Abactinal part of the test of specimen 30 mm. in length, the same as PI. 58. 



" Blake " Exp., 1878-79, Station 222, oS St. Lucia 422 fms. 



5. Abactinal part of the test of the same specimen as fig. 4, seen from the interior. 



