PLATE IV. 



Fig. 1. — Eeceptacttlites Nepttwi, Def ranee. 



A fragmentary specimen showing the inner or upper surface, in places worn down so that only 

 transverse sections of the vertical rays of the spicules are exposed. Natural size. From Devonian 

 strata at Mudstone Bay, Devonshire. The original specimen in the collection of A. Champernowne, 

 Esq., F.G.S. 



Figs. 2, 2 a — 2 d. — Sphjeeospongia tessellata, Phillips, sp. 



Fig. 2. — An imperfect specimen ; showing very distinctly the hexagonal summit-plates of the 

 spicules. Natural size. From Middle Devonian strata at Newton Bushell, Devonshire. The original 

 specimen in the Museum of the Geological Survey, Jermyn Street. 



Fig. 2 a. — A vase-shaped specimen, the upper portion concealed by the matrix. Natural size. 

 The original specimen in the British Museum (Natural History). 



Fig. 2 b. — An imperfect specimen, showing the inner surface of the Sponge-wall, and the vertical 

 and concentric ridges formed by the transverse spicular rays. Natural size. The original specimen in 

 the British Museum (Natural History). 



Fig. 2 c. — A fragment of a specimen showing the spicular structure of the inner surface of the 

 wall. Enlarged two diameters. The original specimen in the British Museum. 



Fig. 2 d. — Another fragment showing the transverse rays of the individual spicules in connection 

 with their respective summit-plates. Enlarged two diameters. The original specimen in the Museum 

 of the Geological Survey, Jermyn Street. 



This specimen, as well as those mentioned above, are from Middle Devonian strata, at Newton 

 Bushell, Devonshire. 



Fig. 3. — Geodites simplex, Hinde, sp. nov. 



A group of detached, siliceous spicules of various sizes. Enlarged twenty diameters. From 

 decayed chert in Carboniferous Limestone at Ben Bulben, Sligo, Ireland. The original specimens in 

 the collection of Joseph Wright, Esq., F.G.S., Belfast. 



Fig. 4. — Kenieea scitula, Hinde, Bp. nov. 



Detached cylindrical spicules. Enlarged twenty diameters. Also from Carboniferous Limestone 

 at Ben Bulben, SUgo. 



Figs. 5 a — 5/. — Kenieea Caeteei, Hinde. 



Detached spicules, showing variations in size and form. Enlarged twenty diameters. From the 

 Upper Limestone series of the Lower Carboniferous, at Dairy, Ayrshire. The original specimens in 

 the collection of Dr. B. J. Hunter, Carluke. 



Fig. 6. — Axinella vetusta, Hinde, sp. nov. 



Detached acuate spicule. Enlarged twenty diameters. From the same horizon and locality as 

 the preceding species. The original specimen in the collection of Mr. John Smith, of Kilwinning. 



Fig. 7. — Pachasteella ht/milis, Hinde, sp. nov. 



Detached four-rayed spicules. Enlarged forty diameters. From Carboniferous Limestone at 

 Ben Bulben, Sligo. 



Figs. 8, 8 a — 8 c. — Aste^iospoitgia deyoniensis, Hinde, sp. nov. 



Several detached spicules, the rays imperfect and partly encrusted by matrix. Enlarged ten 

 diameters. From Middle Devonian strata at Newton Abbot, Devonshire. The original specimens in 

 the collection of Mr. John Smith, Kilwinning. 



