Plate XII. 



4, 6, 9, i8— 20, 22, 23, 26, 27, 29—31 Echinocyamus pusillus. 1, 3, 5, S, 10—16, 21, 25, 28 Ech. grandiporits. 2, 7, 17, 24 



£c^. macrostomus. 



Fig. 1 



— 2 



— 3 



— 4 



— 5 



— 6 



9 

 10, 



11 



12 



!3 



14 



15 

 16 



17 



1 



19. 

 20. 

 21 

 22 



23 

 24 



25 

 26 



27 

 28, 



29. 



3°. 



31 



Echinocyamtis grandiporus, actinal side. 6 -5/i- 



macrostomus, ophicephalous pedicellaria. 325/^. 



— grandiporus, actinal part of the test, from the inside. ?/,. 



— pusillus, ophicephalons pedicellaria. 37/ I# 



— grandiporus, abactinal side. 6- -Vi- 



— pusillus, head of ophicephalons pedicellaria. 3 2 5/ t . 



— macrostomus, triphyllons pedicellaria. 2 4°/j. 



grandiporus, valve of ophicephalous pedicellaria, (the two other valves of the 

 same pedicellaria are represented in Figs. 11 and 12). m/x. 



— pusillus, endcrown of miliary spine, from above. 32S/ X . 



— grandiporus, — - — — — — 325 /i. 



valve of ophicephalous pedicellaria. (Comp. Figs. 8 and 12.) 3*s/ lM 

 - - ( — - 8 - II.) 3*5/,. 



— — ophicephalous pedicellaria. 325/;. 



— part of the test, showing the glassy protuberances among the spine- 



bearing tubercles. 5°/,. 



— — primary spine. 5°/^. 



— — miliary — I?s /v 



— macrostonms, young specimen, abactinal side. 8 /i- 



— pusillus, miliary spine. '75/,. 



— — primary — 5°/j. 



— — valve of triphyllous pedicellaria. 3*5/,. 



— grandiporus, valve of triphyllous pedicellaria. 325/,. 



pusillus, part of the test, showing the glassy protuberance between the pores 

 of the petals. 5°/^, 



— — valve of tridentate pedicellaria. 3*5/^, 



— macrostoinns, actinal side. 8 / I . 



— grandiporus, valve of tridentate pedicellaria. 325/^. 



pusillus, part of the actinal side of the test, showing the two large buccal pores 

 and groups of small pores. 37 /j. 



— — actinal side. 6 / 1 . 



— grandiporus, tridentate pedicellaria. ^s/j. 



pusillus, actinal part of the test, from the inside. 7/,. 



— — tridentate pedicellaria. I2 5/,. 



— — abactinal side. 6 / 1 . 



In the figures 1, 5, 17, 24, 16 aud 31 the small pores are made somewhat more conspicuous 

 than they are in nature. 



