PLATE VII. 



Granatocrintjs Norwoodi, 0. & S., sp., p. 245. 



Page 



Fig. 1. Internal aspect of a broken calyx, showing the paired hydrospire-folds at the sides 



of the ambulacra. Subcarboniferous, Iowa. Coll. Wachsmuth. x 2 . . . 91 



Fig. 2. A similar view of a more perfect specimen. Subcarboniferous, Iowa. Coll. Wachs- 

 muth. x 2 91 



Fig. 3. Central portion of the summit with the vault of small plates covering the peristome. 



Subcarboniferous, Iowa. Coll. Wachsmuth. x 4 75 



Fig. 4. An enlarged view of the vault-plates, among which the central plate and the four 



anterior proximals are readily distinguished 75 



Fig. 5. Summit view of a specimen with the mouth exposed and shortly tubular spiracles. 



Subcarboniferous, Iowa. x 4 107 



Fig. 6. Radial view of the same specimen. x 4 107 



Fig. 7. The summit of an internal siliceous cast, showing the union of the hydrospire- 

 canals before they reach the spiracles. Subcarboniferous, Iowa. Coll. Wachs- 

 muth. x3 53 



Fig. 8. Radial view of a similar cast, on which portions of two deltoids and two lancet-plates 



are still preserved. Subcarboniferous, Iowa. Coll. Wachsmuth. x 2 . . 53 



Fig. 9. Summit view of the same cast. x 2 53 



Fig. 10. The summit of an entire specimen, with the peristome closed by plates. Subcar- 

 boniferous, Iowa. Coll. Wachsmuth. x 2 67 



Fig. 11. The oral centre of the same individual, enlarged to show the summit-plates. x 10 . 75 



Fig. 12. The summit of another specimen, with a closed peristome and separate spiracle- 

 openings in the left anterior deltoid. Subcarboniferous, Iowa. Coll. Wachsmuth. 

 x4 105 



Fig. 13. The oral centre of this specimen, showing the orocentral surrounded by four (or 

 perhaps six) proximals, with the first covering-plates of the anterior ambulacrum 

 resting against the front pair. x 10 75 



Cryptoblastus melo, O. ^ S., sp., p. 232. 



Fig. 14. Summit view of a good specimen, showing the decagonal, lobate outline, the 

 sunken ambulacra, and the anal spiracle. Subcarboniferous, Iowa. Coll. 

 Wachsmuth. xG 109 



Fig. 15. Portion of the summit of a weathered specimen which has lost most of the side 

 plates, so that the hydrospire-plates and pores are exposed. Subcarboniferous, 

 Iowa. Coll. Wachsmuth. x6 109 



