PLATE 70. 

 Lepidesthes colletti White. .Page 42:,. 



Fig. 1. Same specimen as photograph, Plate 69, fig. 6. X 3.6. A specimen of the natural shape with no distortion. 

 Ambulacral plates are nearly rhombic throughout, with sixteen columns in an ambulacra! area at the mid-zone Four 

 columns of plates in an interambulacral area imbricating strongly dorsally and from the center laterally, and over the 

 ambulacra on the adradial suture; the plates of column 3, that imbricates both ways laterally, are much broader 

 than are the plates of other interambulacral columns. Ambulacral plates are rhombic in form from the mid-zone 

 up; ventrally separated ambulacral plates show a dorsal beveled edge. Teeth are in place vent rally (pp. 426, 429). 

 (Compare text-figs. 32-38, p. 75.) 



Fig. 2. Same specimen as photograph, Plate 69, fig. 4. Segment at the mid-zone. X 3.6. Ambulacral plates are more 

 hexagonal than in fig. 1, but the dorsal ambulacral plates in this specimen are rhombic; pore-pairs are toward the 

 next adjacent interambulacrum in each half-area (p. 428). 



Fig. 3. Same specimen as photograph. Plate 69, fig. 7. X 3.5. A very large individual; showing a segment at the mid- 

 zone of a right half-ambulacrum, with the right occluded column, a', of the left half -ambulacrum. Ambulacral plates 

 :irc strongly hexagonal in shape, being proportionately lower and wider than in small individuals (p. 429). (Compare 

 text-figs. 14, p. 54 and 21, p. 59.) 



Fig. 4. Same specimen as Plate 69, fig. 7. X 3.5. A very large individual, showing the introduction of column 5 dorsally 

 within 14 mm. of the top of the specimen; also spines in place (pp. 426, 430). 



Fig. 5. Keokuk Group, Lower Carboniferous, Montgomery County, Indiana. F. Braun Coll. A large specimen showing 

 four columns of interambulacral plates, and tubercles (p. 429). X 3.5. 



