CHENENDOPOEA.— VEERUCULINA. 35 



of Miss Benett's species, I am unable to compare it with the present one in other 

 characters. 



The sponge figured in the frontispiece of the second volume of Parkinson's 

 ' Organic Remains ' is in the Museum collection, and appears to belong to this 

 species ; but without making a section of it, I cannot satisfactorily determine the 

 point. The specimen is stated by Parkinson (/. c. p. 125) to have been found in 

 Wiltshire ; but its appearance differs so much from all the other examples from this 

 county, that it seems to me to have been brought from some other locality, 

 probably France. 



Michelin has figured a sponge under the name of Chenendopora Parkinsonis, Icon. 

 Zooph. p. 131, t. 31. f. 1, which in outer form very closely resembles some of the 

 examples of C. Michelinii; but it difiers in having numerous canal-apertures on the 

 flattened margins of the cup. Zittel has referred this form to the genus Margino- 

 spongia, D'Orbigny, and placed it in the Tetracladina family. Its spicular structure, 

 however, does not yet appear to have been ascertained. 



Distribution. Upper Green Sand : Warminster ; Vaches Noires ] 



Chenendopora pocillum, Michelin. 



1847. Chenendopora pocillum, Midi. Icon. Zoopli. p. 133, t. 33. f. 5. 

 1861. Cupulina pocillum, Court. Epong. Foss. p. 18, t. 29. f. 1. 

 1861. Cupulina elata, Court, ib. p. 18, t. 29. f. 2. 

 1878. Chenendopora pocillum, Zitt. Stud. II Ab. p. 55. 



Distribution. Craie Chloritee \ : France {Bright collection). 



Genus VEREUCULINA, Zitt., 1878. 



Professor Zittel includes in this genus fan, palmate, or funnel-shaped sponges, 

 with projecting oscules on the upper or inner surface of the wall, and with small 

 pore-like openings on the lower or outer surface. For sponges similar in form, but 

 with oscules on both the upper and lower wall-surfaces, Zittel constituted the genus 

 Amphifhelion, but at the same time acknowledges that the differences between it 

 and Verruculina are hardly more than of subgeneric importance. In practice, 

 however, I find that these differences are very difficult of application ; for though in 

 typical forms the distinction between the oscules of the upper and the pores of the 

 lower surface of the sponge is sufficiently clear, there are many examples in which it 

 is difficult to determine whether the canal apertures of the lower surface have the 

 characters of pores or oscules. I therefore propose to relinquish the genus Amphi- 

 thelion and to include the sponges placed therein in the genus Verruculina. The 

 definition of this latter genus will thus have to be extended so as to embrace 



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