PLATE V. 
Figs. 1, la, 16.—Hapuistion Armstronai, 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. R. J. Hunter, Carluke. 
Vig. 1 a.—A fragment of another specimen, showing the partially weathered-out spicules com- 
posing the fibres. Enlarged fifteen diameters. From Law Quarry, Dalry, Ayrshire. 
Fig. 1 6.—A portion of the same, still further enlarged to forty diameters, showing the arrange- 
ment of the spicules. 
Figs. 2, 2a.—Hapnistion VERMICULATUM, Carter, sp. 
Fig. 2.—The type-specimen, showing the upper surface. Hnlarged 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. 2a.—A portion of the same specimen, showing the conical extensions of the fibres and the 
partially weathered-out spicules. Enlarged twenty diameters. 
Figs. 3, 83a—8 d.—Gnopires antiquus, Hinde. 
Fig. 8.—Detached acerate spicules referred to this species. Enlarged twenty diameters. Lower 
Carboniferous. Upper Limestone series, Glencart, Dalry. 
Figs. 3a—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. R. J. Hunter. 
Figs. 4, 4a—49.—GzopITES DEFoRMIS, Hinde, sp. nov. 
Figs. 4, 4a—4 c.— Detached fusiform and sub-cylindrical spicules referred to this species. Hnlarged 
ten diameters. From the Lower Carboniferous, upper part of the Lower Limestone series at Law 
Quarry, Dalry. 
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, 5a—5 c.— PacuastRELLA vetusta, 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, Dalry. The 
original specimens in the British Museum (Natural History) and in the collection of Mr. J. Smith. 
Figs. 6, 6 a—6 f.-— CNEMIDIASTRUM PRISCUM, 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.R.S. 
Figs. 7, 7 a—7 c.—DoryprrMa DALRYENSE, 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, Dalry, Ayrshire. 
The original specimens in the British Museum and in the collection of Mr. J. Smith, Kilwinning. 
Figs. 8, 8a—Sf—Hinpia pumita, 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, F.G.S. 
