12 PERMIAN FOSSILS. 



existence of Halinidas or Sponges with siliceous spicula in the Greensand ;^ and 

 lately, Mr. Lonsdale has described a genus {Conis, a granulo-calcareous Sponge) 

 belonging to the order Leuconida, from the same formation.^ 



Genus Scyphia, Oken. 



Diagnosis. — " Stirps affixa, cava, simplex vel subramosa, cylindracea, ore aperto, 

 e fibris reticulatis."^ (Goldfuss.) 



This genus, which is t)^ified by the recent Spongia flstwlaris, Esper, embraces Sponges 

 " with a reticulated tissue, and whose general form resembles a cylindrical or ex- 

 panded tube, terminated by a large opening."* Goldfuss has figured several Jurassic 

 species. 



ScYPHiA TUBERCULATA, Kinff. Plate II, figs. 1 and 2. 



ScYPHiA TUBEKCULATA, King. Catalogue, p. 5, 1848- 



Diagnosis. — Form cylindrical. Surface tuberculated. With an axial excurrent 

 canal, from which several smaller ones strike off to the surface; the superficial tubercles 

 forming their apertures. 



This Sponge appears to be scarce. It occurs in the Shelly Limestone at Humbleton 

 Hill and Dalton-le-Dale. 



Genus Mammillopora, Bronn. 

 Lymnoeea, Lamouroux. 



Diagnosis. — '^ Masses mammillated, finely porous and reticulated, agglomerated 

 within a common calciform, wrinkled, adherent base."^ 



This genus was originally proposed by Lamouroux, whose name Lymnorea being 

 preoccupied, Bronn was led to replace it in his ^ Pflanzenthiere' and ' Lethsea' by the 

 one herein adopted. The above diagnosis, from the ' Penny Cyclopaedia,' has been 

 used in preference to the one in German given by this author. 



Mammillopora mammillaris. King. Plate II, figs. 3 and 4. 



Manon mammillaris. King. Catalogue, p. 5, 1848. 



Diagnosis. — Form mammillary poljonorphous. Fores minute and polygonal. 



This Sponge has some resemblance to the Jurassic Mammillopora protogaa, Bronn 



1 Proceedings of the Geological Society of London, vol. iii, p. 280. 



2 Quarterly Journal of the Geological Society, vol. v, part i, pp. 63-6. 

 2 Petrefacta, Heft i, p. 4. 



* Milne Edwards, in Lamarck's ' Animaux sans Vertfebres,' vol. ii, p. 578, 2d edition, 1836, 

 ^ Penny Cyclopaedia, vol. xxii, p. 376. 



