SOME WEST INDIAN ECHINOIDS. 27 



Plate 13. 

 (Both figures Xh) 

 Via. 1. Ararosoma violaceum Mortensen. Actinal side. 



The specimen was received in a very bad condition, denuded, flattened, and dried; it has thus been 

 impossible to examine other features than those of test structure, and the identification is 

 therefore given with a little reservation. 

 Fig. 2. Calreria hyslrix (Wyville Thomson). Actinal side. 



Plate 1-1. 



Fig. 1. 5«(/ZoarfnrM a#nis (Philippi). Part of ambulacrum x 7. 



2. Cirfaris a6)/ssicok (.\. Agassiz). Part of ambulacrum X 6.8. 



3. Cidaris abyssicola, var. teretispina Mortensen. Part of ambulacrum (from the specimen repre- 



sented in Plate 10, fig. 2) X 5.8. 



4. Cidaris abyssicola, var. teretispina. Part of ambulacrum X 5. 



5. Calocidaris micans (Mortensen). Interambulacral plate X 4. 



6. Calocidaris micans (Mortensen). Part of ambulacrum X 5. 



7. Cidaris blalei (A. Agassiz). Part of ambulacrum X 6. 



8. Tretocidaris bartlctti (A. Agassiz). Interambulacral plate X 6. 



9. Tretocidaris bartletti (A. Agassiz). Part of ambulacrum X 8.5. 



10. Stylocidaris lineata, new species. Part of ambulacrum X 7.5. 



11. Cidaris rugosa (C\a.rk). Part of ambulacrum X 8. 



12. Cidaris cidaris (Linnaeus). Part of ambulacrum from a specimen of 33 mm. horizontal diam- 



eter of test, corresponding in size to the specimen of C. rugosa, from which fig. 11 was 

 made X 8.5. 



Plate 15. 



Figs. 1-2. Calocidaris micans (Mortensen). Actinal spines x 7. (Compare fig. 7.) 



3. Cidaris abyssicola, var. teretispina 'MoTteneen. Apical system. From a specimen of 47 mm. 

 h. d. X 3. (Compare fig. 6.) 

 4-5. Cidaris abyssicola {A. Agassiz). Actinal spines X 7. (Compare figs. 10-11.) 



6. Cidaris abyssicola, var. teretispina Mortensen. Apical system. From a specimen of 36 mm. 



h. d. X 2.8/1. (Compare fig. 3.) 



7. Calocidaris micans (Mortensen). Actinal spine X 7. (Compare figs. 1-2.) 



8. Tretocidaris bartletti {A. Agassiz) . Actinal spine X 8. (Compare figs. 13-14.) 



9. Cidaris abyssicola (A. Agassiz). Apical system X 2.8. 



10-11. Cidaris abyssicola (A. Agassiz). Actinal spines X 7. (Compare figs. 4-5.) 



12. Tretocidaris bartletti (A. Agassiz). Apical system X 5.5. 

 13-14. Tretocidaris bartletti (A. Agassiz). Actinal spines X 8. (Compare fig. 8.) 



Plate 16. 



Fig. 1. Cidaris rugosa (Clark) . Valve of tridentate pedicellaria. Side view X 60. 

 2. Tretocidaris bartletti (A. Agassiz). Transverse section of spine X 55. 

 3-5. Calocidaris micans (Mortensen). Valves of pedicellarite. 3. Tridentate pedicellaria from 

 the inside. 4. Small globiferous pedicellaria; side view. 5. Small globiferous (?). 

 Side view X 60. (Compare figs. 7-8, 10, 13.) 

 6. Stylocidaris lineata, new species. Part of ambulacral plates X 35. 

 7-8. Calocidaris micans (Mortensen). Valves of tridentate pedicellaria;. 7. Side view; 8, from 

 the inside 60. (Compare figs. 3-5, 10, 13.) 

 9. Stylocidaris lineata, new species. Transverse section of radiole X 55. 



10. Catofidans micans (Mortensen). Valve of small globiferous pedicellaria. Side view 60. (Com- 



pare figs. 3-5, 7-8, 13.) 



11. Cidaris abyssicola (A. Agassiz). Transverse section of radiole X 55. 



12. Tretocidaris bartletti (A. Agassiz). Part of ambulacral plates X 30. 



13. Ca/ocirfarwm!'ca»!s (Mortensen). Valve of small tridentate pedicellaria. Side view 60. (Com- 



pare figs. 3-5, 7-8, 10.) 



14. Ca/ocirfam 7m'ea?is (Mortensen). Part of ambulacral plates X 24. 



26599°— Bull. 74—10 3 



