PLATE XIX. 



Page 

 Fig. 1. Kalpinella pater (sformis, Hinde. Two-thirds the natural size. From the Upper 



Green Sand at Warminster, Wiltshire 77 



Fig. 1 a. The same. Transverse section of the stem, showing the distribution of the canals. 



Natural size. 

 Fig. 1 b. The same. Portion of the interior spicular skeleton. Enlarged sixty-four times. 



Drawn from a transparent section by means of the camera lucida. 

 Fig, 2. Kalpinella rugosa, Hinde. Two-thirds the natm'al size. From the Upper Green 



Sand at Warminster 78 



Fig. 3. Ragadinia compressa, Hinde. Natural size. From the interior of a flint from the 



Upper Chalk at Huish, Wiltshire 82 



Fig. 3 a. The same. Two detached spicules, enlarged sixty-four times, from the Upper Chalk 



at Horstead, Norfolk. The spicules on the outer surface of fig. 3 resemble these 



forms, but they are not sufficiently clear to be shown. 

 Fig. 4. Ragadinia clavata, Hinde. Natural size. From the interior of a flint from the 



Upper Chalk of Wiltshire. The specimen belongs to the Jermyn-Street 



Museum 84 



Fig. 4 a. Tlie same. A small club-shaped specimen, natural size, also from the interior of 



a flint. 

 Fig. 4 b. The same. A portion of the surface of fig. 4, enlarged sixty-four times, showing 



the spicular skeleton immediately beneath the dermal layer. 

 Fig. 4 c. The same. Portion of the surface of fig. 4 where the dermal layer has been pre- 

 served, showing the complete head of one spicule and fragments of others. 



Enlarged thirty-two times. 



