PLATE XXI. 



ZaPHRENTIS AMPLA 11. sp. 



Fig. 1. The interior of the cup of a large specimen, showing an obhqnely placed fosset. Hamilton 



group, Darien, N. Y. 

 Fig. 2. The calyx of a smaller specimen, where the rays are obsolete on a part of the transverse 



plate. The fosset is situ.ited, as in the preceding specimen, but very indistinct. 



Hamilton group, York, Livingston county, N. Y. 

 Fig. 3. Lateral view of the specimen fig. 2. 

 Fig. 4. Lateral view of a large specimen of similar form with the preceding. 



This species is placed by Dr. Rominger with Zaphrentis proJifica of Billings. 



Zaphrentis simplex. 



Slromhodfs simplex Hall. GeoloKV of N. Y. Surv. Fourth Geolcig. Dist. pp. 209, 210, flg. 6. 1843. 



Fig. 0. Posterior view of a specimen of usual form, showing the cup with rays extending to the 

 center. Moscow, N. Y. 



Fig. 6. View of a specimen showing a broad transverse plate destitute of rays. 



Fig. 7. Lateral view of the same, showing the general form of the coral. 



Fig. 8. Transverse section just below the bottom of the cup. This is the original specimen of the 

 species. 



Fig. 9. Longitudinal section of a specimen, showing closely crowded transverse plates, some of 

 which have rays extending nearly to the center, and others destitute of rays. 



Fig. 10. Longitudinal section of another individual with more distant transverse plates. 



Fis. IL Lateral view of a specimen, exhibiting unusual characters of the cup, corresponding more 

 nearly to those of Z. Halli, and referred with doubt to this species. From near Mos- 

 cow, N. Y. 



