PLATE V. 



Figs. 1, 1 a, 1 b. — Haplistion Abmsteongi, Young and Young. 



Fig. 1. — The type-specimen, showing its upper surface. Enlarged two diameters. Lower 

 Carboniferous. From the upper part of the Lower Limestone series at Cunningham Baidland, 

 Ayrshire. The original specimen in the collection of Dr. E. J. Hunter, Carluke. 



Eig. 1 a. — A fragment of another specimen, showing the partially weathered-out spicules com- 

 posing the fibres. Enlarged fifteen diameters. From Law Quarry, Dairy, Ayrshire. 



Eig. 1 b. — A portion of the same, still further enlarged to forty diameters, showing the arrange- 

 ment of the spicules. 



Figs. 2, 2 a. — Haplistion teemiculattjm, Carter, sp. 



Fig. 2. — The type-specimen, showing the upper surface. Enlarged two diameters. Lower 

 Carboniferous, upper part of the Lower Limestone series, at Cunningham Baidland, Ayrshire. The 

 original specimen in the collection of Mr. James Thomson, F.G.S., Glasgow. 



Fig. 2 a. — A portion of the same specimen, showing the conical extensions of the fibres and the 

 partially weathered-out spicules. Enlarged twenty diameters. 



Figs. 3, 3 a — 3 d. — Geodites antiqt/us, Hinde. 



Fig. 3. — Detached acerate spicules referred to this species. Enlarged twenty diameters. Lower 

 Carboniferous. Upper Limestone series, Glencart, Dairy. 



Figs. 3 a — d. — Detached bifid and trifid spicules. The shafts of all are imperfect. Enlarged 

 twenty diameters. From the same horizon and locality as the preceding. The original specimens in 

 the collections of Mr. J. Smith and of Dr. E. J. Hunter. 



Figs. 4, 4 a — 4>g, — Geodites defoemis, Hinde, sp. nov. 



Figs. 4, 4 a — 4 c. — Detached fusiform and sub-cylindrical spicules referred to this species. Enlarged 

 ten diameters. From the Lower Carboniferous, upper part of the Lower Limestone series at Law 

 Quarry, Dairy. 



Figs. 4d — 4<g. — Detached bifid and trifid spicules of this species. The shafts in all are imperfect. 

 Enlarged ten diameters. From the same beds as the preceding. The original specimens in the 

 collections of Mr. John Smith and Mr. James Bennie. 



Figs. 5, 5 a — 5 c. — Pachasteella vettjsta, Hinde. 



Detached four- and five-rayed spicules, referred to this species. Enlarged twenty diameters. 

 From Lower Carboniferous, upper part of Lower Limestone series, Law Quarry, Dairy. The 

 original specimens in the British Museum (Natural History) and in the collection of Mr. J. Smith. 



Figs. 6, 6 a — Gf. — Ckemidiastetjm pbiscum, Hinde, sp. nov. 



Detached spicules of various forms, referred to this species. Enlarged forty diameters. From 

 Carboniferous Limestone at Ben Bulben, Sligo, Ireland. The original specimens in the collections of 

 Mr. J. Wright and of Mr. H. J. Carter, F.E.S. 



Figs. 7, 7 a — 7 c. — Doeydeema dalexense, Hinde. 



Detached spicules of various forms, referred to this species. Enlarged forty diameters. From 

 the Lower Carboniferous, upper part of Lower Limestone series at Law Quarry, Dairy, Ayrshire. 

 The original specimens in the British Museum and iu the collection of Mr. J. Smith, Kilwinning. 



Figs. 8, 8 a — 8/. — Hinpha pttmila, Hinde, sp. nov. 



Detached spicules of various forms, referred to this species. Enlarged forty diameters. From 

 Carboniferous Limestone at Ben Bulben, Sligo. The original specimens in the collection of Mr. 

 Joseph Wright, E.G.S. 



