310 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Plate 73 

 Details of ambulacral structure 



Fig. 1. Rhopalocidaris hirsutispina (de Meijere), v&T.viridis, new variety. X12. 



2. Rhopalocidaris hirsutispina (de Meijere), var. viridis, new variety. X30. 



3. Psilocidaris echinulata, new species. X 12. 



4. Psilocidaris echinulata, new species. X30. 



5. Goniocidaris {Cyrtocidaris) tenuispina, new species. X12. 



6. Goniocidaris {Cyrtocidaris) tenuispina, new species. X30. 



7. Goniocidaris {Cyrtocidaris) tenuispina, var tuberculata, new variety. X12. 



8. Goniocidaris {Cyrtocidaris) tenuispina, var. tuberculata, new variety. X30- 



Plate 74 

 Details of ambulacral structure 



Fig. 1. Schizocidaris serrata Mortensen. X12. 



2. Schizocidaris serrata Mortensen. X30. 



3. Schizocidaris fasciata, new species. X 30. 



4. Goniocidaris {Discocidaris) peltata, new species. X 12. 



5. Goniocidaris {Discocidaris) peltata, new species. X30. 



6. Stylocidaris reini (Doderlein), var. rubida, new variety. X12. 



7. Stylocidaris reini (Doderlein), var. rubida, new varietj\ X30. 



8. Stereocidaris sceptiferoides Doderlein, var. lamellata, new variety. X12. 



9. Stereocidaris sceptiferoides Doderlein, var. lamellata, new var sty. X30. 



Plate 75 

 Details of ambulacral structure 



Figs. 1-2. Stylocidaris effluens, new species. X12. 



3. Stylocidaris annidosa, new species. X 12. 



4. Stylocidaris reini (Doderlein), var. cladothrix, new variety. X12. 



Plate 76 



Figs. 1-2. Scrobicular spines of Histocidaris magnifica, new species. X12. 



3. Valve of tridentate pedicellaria of Histocidaris magnifica, new spe- 

 cies. X38. 



Plate 77 



Pedicellariae, and a scrobicular spine 



Fig. 1. Valve of tridentate pedicellaria, large form, of Histocidaris elegans (A. 

 Agassiz). X38. 



2. "alve of tridentate pedicellaria, small form, of Histocidaris elegans (A. 



Agassiz) (specimen from station 5450). X65. 



3. Valve of tridentate pedicellaria, large form, of Histocidaris elegans (A. 



Agassiz) (specimen from station 5450) . X38. 



4. Valve of tridentate pedicellaria, large form, of Histocidaris acutispina, 



new species. X38. 



5. Valve of tridentate pedicellaria, large form, of Histocidaris, species. 



X38. 

 6-7. Valve of tridentate oedicellaria, small form, of Histocidaris, species. 

 X65. 

 8. Scrobicular spine of Histocidaris, species. X12. 



