PLATE VII. 



Page 

 Fig. 1. Pachinion scriptum, Rcem. sp. A medium specimen from the Upper Chalk at 



Flamborough, Yorkshire. Natural size 46 



Fig. 1 a. The same. Transverse section of another specimen from the same locality, 



showing the cloacal tuhe and sections of the skeletal fibres. Natural size. 

 Fig. 16. The same. One of the spicules of the fibre. Enlarged sixty-four times. From 



the Upper Chalk at Schweichelt, Brunswick. 

 Fig. 1 c, d. The same. Spicules of the dermal layer. Enlarged sixty-four times. From 



the Upper Chalk at Schweichelt, Brunswick. 

 Fig. 2. Placonella perforata, Hinde. Showing the upper surface. Natural size. From 



the Upper Jura at Natthelm, Wurtemberg 47 



Fig. 2 a. Tlie same. A small portion of the upper surface of the same specimen, showing 



the disposition of the spicules. Enlarged sixteen times. 

 Fig. 2 b. The same. A single spicule from the outer surface. Enlarged thirty-two times. 

 Fig. 3. Holodictyon capHatum, Hinde. Natural size. From the Upper Green Sand at 



Warminster, Wiltshire 51 



Fig. .3 a. The same. A vertical median section of another example from the same locality, 



showing a central cloaca. Natural size. 

 Fig. 3 b. The same. Portion of the outer surface of the same specimen, showing the 



disposition and mode of attachment to each other of the skeletal spicules. 



Enlarged thirty -two times. 



