PEEONELLA. 169 



Peronella eamosa, F. a. Boemer, sp. (Plate XXXIII. fig. 5.) 



1839. Scyphia ramosa, F. A. Roemer, Verst. d. Nordd. Oolit. Naclitrag, p. 10, t. \7. f. 27. 

 1844. Scyphia ramosa, Mant. Medals of Creation, vol. i. p. 227. 

 1861. Disccelia ramosa, From. Cat. raisonne, p. 9, t. 1. f. 5. 

 1878. Peronella ramosa, Zitt. Studien, III Ab. p. 32. 



Sponge growing in small bushy masses of branching cylindrical tubes, from 4*5 to 

 6 mm. in diameter. The summits are rounded, with a cloacal aperture about 1'5 mm. 

 in width. Occasionally the low^er portion of the stems is enveloped by a compact 

 dermal layer ; when this is not present, the surface shows only the irregular apertures 

 between the fibres. 



A transparent section of a specimen from Farringdon exhibits indistinctly bounded 

 fibres about '15 mm. in width ; the spicular structure has been mostly obliterated, so 

 that only rarely can small three-rayed spicules be detected. 



Distribution. Lower Neocomian : Censeau, Jura. Lower Green Sand: Farringdon, 

 Berkshire. 



Peronella Gillieroni, de Loriol, sp. (Plate XXXIII. fig. 10.) 



1869. Disccelia Gillieroni, de Loriol, Mon. de I'etage Urgon. p. 66, t. 4. f. 16, 17, 18. 

 1878. Peronella Gillieroni, Zitt. Studien, III Ab. p. 33. 



Sponges growing in bushy masses, from 28 to 40 mm. in height, of cylindrical 

 branching individuals, from 5 to 7 mm. in diameter. The summits are truncate or 

 rounded, and the cloacal aperture is from 1'5 to 2 mm. in width. There are traces 

 in some examples of an enveloping dermal layer in the basal portion. 



The fibrous structure resembles that of P. rarnosa, from which it is distinguished 

 by the larger size of the individual spongites. 



Distribution. Lower Green Sand : Farringdon, Berkshire. Lower Neocomian : 

 Berklingen, Brunswick. 



Peronella prolifera, Tlinde, n. sp. (Plate XXXIII. figs. 8, 8 a.) 



Sponges growing in bushy masses, from 40 to 50 mm. in height, of cylindrical 

 bifurcating stems, with rounded and occasionally inflated summits. The stems vary 

 in thickness from 6 to 10 mm., and the cloacal tube is from 1'75 to 2 mm. in width. 



In a transparent section the fibres are seen to be relatively stout, from '2 to 'o mm. 

 in thickness ; the structure has been largely destroyed by crystallization, but in places 

 small three- and four-rayed spicules are clearly shown. The spicular rays vary from 

 •04 to '1 mm. in length. 



This species is distinguished from P. Gillieroni and P. ramosa, with which it occurs 

 in the same beds at Farringdon, by its larger size and more open mode of growth ; 

 the fibres also are thicker ; but the spicular structure, so far as the condition of the 



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