196 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [NoV. 30, 



ingSj and by the stellate arrangement of the canals within each 

 opening. 



Plate V. fig. 3. A cup-shaped variety. 



Fig. 4. Expanded variety. 



Fig. 4 «. A canal-opening magnified. N.B. The artist has drawn 

 the star of too regular a form. 



Manon porcatum, Sharpe. Pl. V. fig. 2. 



M. sessile, cyathiforme vel expansum ; fibris laxis, reticulatis ; extus nudum, 

 rugosissimum ; intus membranaceuui, osculis parvis, numerosis, in-egu- 

 laribus. 



A sponge attached at its base, either irregularly cup-shaped or 

 expanded, consisting of a loose fibrous network covered on the inner 

 side by a slight membrane, which is pierced by very numerous, small, 

 ill-defined openings ; the outer surface is ornamented with highly 

 projecting branching wrinkles, which divide and re-unite irregularly. 



This species is nearly related to Manon j)e^z>a, from which it 

 differs not only in the peculiar wrinkling of the surface, but also in 

 a looser texture, and less regularly defined and more numerous canal- 

 openings. In its external wrinkling it resembles Spongia sulcataria 

 of Micheliu, which belongs to a different genus. 



Height 1 to 3 inches. 



From the gravel of Little Coxwell near Farringdon. 



Plate V. fig. 2. External view. 



Fig. 2 a. Inner surface magnified. 



Manon Farringdonense. Pl. V. figs. 5 & 6. 



M. sessile, cyathiforme ; extus nudum, tuberosum ; intus superne porosum, 

 infra membranaceum. 



A cup-shaped sponge, attached at the base, formed of coarse and 

 loosely netted fibres ; the inner side of the cup is lined, nearly to the 

 top, with a thick membrane, without any openings ; above this the 

 upper part and the edge of the cup are uncovered and are pierced by 

 the numerous irregular openings of large canals, which descend 

 nearly perpendicularly and open downward on the outer surface. 

 The exterior is fibrous, and irregularly and variously wrinkled. 



Height and diameter 2 to 3 inches. 



Found in the Sponge-gravel of Little Coxwell near Farrmgdon. 



This species differs from all those with which it is associated in 

 having the lower part of the cup entirely lined by a thick membrane, 

 leaving only the upper portion of the interior porous. 



Plate V. fig. .5. Exterior of a wrinkled variety. 



Fig, 6. Interior of another specimen. 



Lopholepis Hagenovii, Sharpe. Pl. V. fig. 7. 



L. expansa, parasitica ; cristis elongatis, sub-ramosis, disjuuctis, utrinque 

 3- vel 4-seriatim porosis ; poris liueas obliquas describentibus. 



An incrusting coralline with long, narrow, porous ridges rising out 

 of a smooth crust ; the ridges are detached, but are usually arranged 

 with some resemblance to branches on each side of a stem ; the 



