CEPHALITES.— CTPELLIA. 123 



disposed either in horse-shoe form or in irregular loops, so that the interspaces have 

 a generally sinuous character. The interior, or cloacal surface, is perforated with 

 cylindrical canal-apertures. 



The interior of the wall is composed of plaits, about 1-25 mm. wide; seen in 

 transverse section, they are arranged in deep folds with occasionally intervening 

 loops. The spicular mesh of the plaits is more regular than in the preceding 

 examples ; the nodes are lantern or octahedral, and the distance from node to node 

 is '58 mm. 



The C. compressus, T. Smith, appears to be merely the upper fragmentary portion 

 of a specimen of C. catenifer. The original of Smith's figure, I. c. t. 14. f. 10, has no 

 trace of a stem or root as represented in the figure. The representation of a transverse 

 section of the plait in f. 15 is partly a restoration. 



I am unable to follow Prof. Zittel in separating this species to form a distinct 

 genus. Seen in transverse section, the plaits of the wall do not appear to be more 

 complicated than in the typical forms of Cephalites, and they do not seem to possess 

 the distinctive characters of the Meandrospongida?. 



Toulmin Smith has given a description and figure of another species of Cephalites, 

 under the name of C. retnisus* ; but the figured type in the Museum Collection is 

 merely a mould in wax, from which it is impossible to determine whether the 

 specimen has been a sponge or not. 



Distribution. Upper Chalk : South of England {coll. T. Smith). 



Family STAUEODEBMIDjE, Zitt. 



Genus CYPELLIA, Pomel {emend. Zitt. 1877). 



Ctpellia rugosa, Goldf. sp. 



1826-33. Scyphia rugosa, Goldf. Petref. 1 Th. p. 9, t. 3. f. 6. 



1877. Cypellia rugosa, Zitt. Studien, I Ab. p. 53 ; Neues Jahrbuch, p. 364, t. 4. f. ] ; Hand- 

 buch der Pal. 1 Bd. p. 179, f. 94. 



Distribution. Upper Jura : Streitberg, Franconia. 



Ctpellia infundibuliformis, Goldf. sp. 



1826-33. Scyphia rugosa, var. infundibuUformls, Goldf. Petref. 1 Tli. p. 87, t. 32. f. 2. 



1878. Crucispongia annulata and cruciata, Qiicnst. Petref. Bd. 5, p. 165, t. 123. f. 2-5. 



Distribution. Upper Jura : Heuberg, Streitberg, Randen. Oolite infcrieure : 

 Verson, France. 



* Annals & Mag. Nat. Hist. 1S48, 2nd ser. vol. i. p. 285, pi. 14. f. S. 



