FROM THE INFERIOR OOLITE. 553 



Figs. 10, 11. Leptophragma fragile. 



Fig. 10. Part of the outer surface of the sponge : natural size. 

 11. Transverse section showing skeletal network: (X 45). 

 11a. Tangential section: (X 45). 



Figs. 12-14. Plectospyris elegans (gen. et spec. nov.). 



Fig. 12. The sponge : natural size. 



13. A single node of the skeleton, showing the absence of an octahedral 



lantern. 



14. Part of the skeleton seen in section : ( X45). 



Figs. 15, 16. Plectospyris major (sp. nov.). 



Figs. 15, 16. Fragments of the skeleton seen in longitudinal and transverse 

 sections : (x 45). 



Plate XXI. 

 Figs. 17-21. Calathiscus variolatus (gen. et sp. nov.). 



Fig. ] T. The sponge : nat. size. 



\8. The upper end of the sponge, showing the larger ostia of the interior 

 (p.i) and the smaller external ostia (o.e) : nat. size. 



19. Portion of the skeleton near the outer surface, showing traces of spicules 



in the fibre ; seen in section : ( X 55). 



20. Fragments of skeleton, seen in section, showing complication of the 



nodes. 



21. Outlines of rhombohedral crystals imbedded in the matrix : (X 55). 



Figs. 22-25. Platychonia elegans (sp. nov.). 



22. Sponge : reduced \ . 



Figs. 23 & 24. Portions of the skeleton, in section, with a Tetracladine facies : 



(X 70). 

 Fig. 25. A skeletal element with a Rhizomorine appearance : ( X 70). 



Figs. 26, 27. Peronella Metabronnii (sp. nov.). 



Figs. 26, 27. Sponge : natural size. 



Fig. 28. Thamnonema pisif or me (gen. et sp. nov.). 



Fig. 28. Thamnonema pisiforme, showing fibres of the base ; c. centre of origin ; 

 a. primary, and b. secondary fibres : ( X 15). 



Figs. 29 & 30. Limnorea pygnwa (sp. nov.). 



Fig. 29. Sponge : nat. size.4, 



30. Base showing concentrically-wrinkled epitheca. 



Fig. 31. Peronella repens (sp. nov.). 



31. Sponge : nat. size. 



Discussion *. 



The liev. H. H. Wenwood said that Mr. Whidborne had not men- 

 tioned and seemOd to be unacquainted with the collection of Bra- 

 chiopoda in the Museum at Bath. With regard to the new Bra- 

 chiopod from Dundry, he supposed that the author was aware of 

 Mr. Moore's labours in this lield, and that he had written a paper 

 on Liassic and Oolitic Holothuridoe. 



Dr. Woodward said it was fortunate Mr. "Whidborne had devoted 

 himself to this subject, and as he had considerable experience, he 

 thought good results were likely to follow. The small spicula of a 

 Holothurid described were probably the wheels of Chirodota. He 

 would doubtless find a rich field of research in the Bath Museum. 



* Including the Discussion on the preceding paper. 



2r2 



