146 INVERTEBRATA. 



VERTICELLITES ANNULATUS, sp. nov. 

 (Plate viii., fig. 2.) 



Sponge bodies cylindrical, growing attached in groups. The 

 segments of the bodies are numerous and distinctly defined, pro- 

 ducing a strong annulation of the exterior; distal (oscular) end 

 gently convex, flattened. The whole surface is strongly granulated. 



Measurements. Our specimens are about 20 mm. long and 

 10 mm. broad ; height of single rings (segments) about 2 mm. 



The rugose surface and strongly-ringed characters of this form 

 distinguish it sharply from all the other species. Each sponge 

 body looks like a series of inverted saucers, or shallow acorn-cups 

 piled one upon the other and strung together by a central tube. 



Locality. Upware. 



VERTICELLITES CLAVATUS, sp. nov. 

 (Plate VIIL, fig. 3.) 



Sponges growing in groups, attached to foreign bodies. Sponge 

 bodies simple or giving off lateral shoots ; contiguous bodies often 

 fusing together. Individuals obconic or clavate ; surface smooth or 

 irregularly annulated, shewing a delicate net-structure. Upper 

 end gently convex with slightly projecting central osculum. Walls 

 thin ; body-cavity subdivided by numerous, delicate, convex parti- 

 tions, which are connected by a central cloacal tube, provided with 

 openings into each chamber. 



Measurements. Length, If inches; thickness near summit, 

 15 mm. 



The shape of the sponge body distinguishes this from all the 

 other species. The walls too are thinner and the septa more deli- 

 cate than in the common V. anastomosans, these characters being 

 perfectly constant in all our specimens. 



Localities. Upware, Brickhill, Farringdon. 



CATAGMA CUPULIFORMIS, From., sp. 

 Chenendopora fimgiformis ? Sharpe. 



Cupulochonia cupuliformis, E. de Fromentell. Introd. d I'etude 

 des eponges Fossiles, pi. m., f. 5. 



