414 
Longest radials 25 to 100 mm, 
Spines white. 
dubius (23), enneacanthus (29), mojavensis (30), octacanthus (36). 
Spines straw-color or yellow. 
zuniensis (31), gonacanthus (33), hexaedrus (35). 
Spines dusky or variegated, 
fendleri (28), princeps (50), schottit (78), sargentianus (79). 
++ Radial spines from 10 to 16, 
Radials 2 to 6 mm, long. 
viridiflorus (1), poselgeri (44). 
Longest radials 10 to 12 mm. 
tubulosus (2), aggregatus (38), pecten-aboriginum (68), tetazo (70). 
Longest radials 15 to 18 mm. 
pringlei (69). 
Longest radials 25 to 100 mm. 
enneacanthus (29), weberi (73), schottit (78), sargentianus (79). 
+++ Radial spines from 15 to 20. 
Longest radials 6 to 10 min. 
viridiflorus (1), spinosus (12), radians (14). 
Longest radials 12 to 18 mm. 
tubulosus (2), rufispinus (16). 
Longest radials over 20 mm. 
schottit (78), sargentianus (79). 
+ + + + Radial spines more than 20. 
emoryt (62), schottit (78), sargentianus (79). 
** * Central spines 2 tu 4. 
+ Radial spines 10 or less. 
Radial spines 1 to 2 mm. long. 
greggit (48). 
Radial spines 4 to 12 mm. long. 
aggregatus (38), maritimus (40), grandiflorus (55), flagelliformis (61). 
Longest radials 16 to 20 mm. 
roetteri (15), acifer (24), flaviflorus (25), cinerascens (27), pitajaya (49), thurberi 
(75), flexuosus (77), eriophorus (82). 
Longest radials 25 to 30 mm. 
stramineus (22), dubius (23), roemeri (37), polyacanthus (39). 
+ + Radial spines 10 to 15, 
Radial spines 5 to 10 mm. long. 
chloranthus (3), brandegei (21), maritimus (40), paciticus (41), tlagelliformis (61). 
Radial spines 10 to 15 mm. long. 
neo-mexicanus (5), engelmanni (18), variegatus (19), chrysocentrus (20), brandegei 
(21), aggregatus (38), mamillatus (63), hollianus (76). 
Radial spines 15 to 20 mm. long. 
roettert (15), sanborgianus (26). 
Radial spines more than 20 mm. long. 
stramineus (22), roemeri (37), polyacanthus (39). 
+ + + Radial spines 15 to 20, 
Radial spines 5 to 10 mm, long. 
chloranthus (3), clenoides (6), pectinatus (1), centralis (11), brandegei (21). 
