192 CALCAEEOUS SPONGES. 



OcuLOSPONGiA DiLATATA, Bcein. sp. (Plate XXXVI. fig. 3.) 



1864. Tremospongia dilatata, F. A. Roem. Pal. Bd. 13, p. 10, t. 1. f. 24 a, b. 

 1874. Ocidosponr/ia {flabellata?),'Da.vey, Transac. Newbury Field Club, p. 11. 

 1878. Oculospongia dilatata, Zitt. Studien, III Ab. p. 43. 



Sponges growing in small hemispherical or laterally extended masses, from 15 to 

 20 mm. in height and 16 to 34 in width. The base is inverted conical, flattened or 

 concave, and invested with a concentrically furrowed and wrinkled dermal layer. 

 The upper surface only exhibits irregular interspitces between the mesh-fibres and 

 irregularly scattered canal-apertures, with complete margins, about 1 mm. in width, 

 which, in the best-preserved specimens, slightly project above the general surface. 

 In a vertical section the fibres appear as so many radiating lines, with transverse 

 connections. Some of the canals extend from the base to the surface, whilst others 

 only reach a short distance into the sponge. The fibres are from "1 to -3 mm. in 

 thickness ; the spicular structure, as seen in a specimen from Berklingen, is of the 

 Sesfrostomella type. No structure is shown in examples from Farringdon which I 

 have examined. 



IHstrilntion. Lower Green vSand : Farringdon. Hils-Conglomerate : Berklingen, 

 Brunswick. 



Oculospongia tubulifera, Goldf. sp. 



1826-33. Manon tuhuliferum, Goldf. sp. Petref. 1 Th. p. .2, t. 1. f. 5. 

 1878. Omlospongia tubulifera, Zitt. Studien, III Ab. p. 43. 



The fibres, as seen in a transparent microscopic section, are from 'IG to 3 mm. in 

 thickness ; no spicular structure has been preserved. 

 Listrthufion. Upper Chalk : Maestricht. 



Genus CRISPISPOXGIA, Quenst. 1878. 

 Crispispongia pezizoides, Zitt. 



1878. Crispispongia pezizoides, Zitt. Studien, III Ab. p. 44. 

 1826-33. Manon peziza, Goldf. pars, Petref. 1 Th. t. 34. f. 8 b. 



Distribution. Upper Jura : Nattheim, Wiirtemberg. 



Crispispongia expansa, Quenst. 



1878. Crispispongia expansa, Quenst. Petref. Bd. 5, p. 198, t. 124. f. 38-47. 

 1878. Crispispongia expansa, Zitt. Studien, III Ab. p. 41. 



Distribution. Upper Jura: Nattheim. 



