28 BULLETIN 74, UNITED STATES NATIONAL MUSEUM. 



Plate 17. 



Fig. 1. Trctocidaris bartletti (A. Agassiz). Valve of tridentate pedicellaria. Side view X 50. (Com- 

 pare fig. 6.) 



2. Cidaris ahysskola, var. leretispina Mortensen. Valve of small globiferous pedicellaria X 60. 



3. Cidaris abyssicota, var. tcrctispina Mortensen. Valve of small globiferous pedicellaria X GO. 



(Compare fig. 5.) 



4. Stylocidaris lincata, new species. Tridentate pedicellaria X 60. 



5. Cidaris abysskola, var. leretispina Mortensen. Valve of tridentate pedicellaria, side view 



X 40. (Compare fig. 3.) 



6. Tretocitlaris bartletti (A. Agassiz). Valve of small globiferous pedicellaria X "0. (Compare 



fig. 1.) 



7. Ca/ociV/am ww'cans (Mortensen). Valve of tridentate pedicellaria. Side view X 45. (Compare 



pi. 16, figs. 3, 7-8, 13.) 



8. Slylocidaris lineata, new species. Valve of tridentate pedicellaria. Side view X 60. 



9. Cidaris abyssicola (A. Agassiz). Two-iieadcd small globiferous pedicellaria X 60. 



10. Cidaris abyssicola {\. Agassiz). Valve of small globiferous pedicellaria X 60. 



11. Cidaris abyssicola (A. Agassiz). Tridentate pedicellaria X 35. 



12. Calocidaris vvicans (Mortensen). Valve of large globiferous pedicellaria. Side view X 60. 



13. Calocidaris micans (Mortensen). Large globiferous pedicellaria X 40. 



14. Slyloddaris affinis (Philippi). Tridentate pedicellaria X 60. 



