72 M. K. A. Zittel on Fossil Calcispongios. 



5. Elasmoccelia orbiculata, Rom. Spongit. Taf. ii. fig. 11. 

 Hils. 



6. Elasmojerea tortuosa, Loriol, Urgon. Land. pi. v. figs. 

 16, 17. Urgonian. 



Conoccelia, Zittel. 



Siphonoccelia p. p., From. 

 Linmorea p. p., Horn. 



Sponge obconical or top-shaped, simple, or polyzoic by 

 gemmation at the upper margin, very thick-walled ; vertex 

 broadly truncate, with a central, very deep, funnel-shaped 

 stomachal cavity. Surface porous, with horizontal rings of 

 growth. A true canal-system is deficient ; but the sponge- 

 body consists of successively formed horizontal layers of 

 coarse anastomosing fibrous tissue, which have between them 

 narrow interspaces for the circulation of water. 



Among the spicules of the skeletal fibres I believe I have 

 recognized simple bacillar spicules as well as triradiates. 

 Some of the latter are four or five times as large as the others, 



This genus, united with Sijyhonoccelia by Fromentel, from 

 its laminar structure, which somewhat reminds one of that of 

 certain Rudistes (Radiolites and Sphcendites) , and also, from 

 the unusual thickness of the wall, the truncated upper margin, 

 and the occasional singular budding of the latter, acquires so 

 peculiar an aspect that it can readily be distinguished from 

 Peronella. 



In the French Neocomian only monozoic individuals usually 

 occur ; but in the North-German Hils polyzoic specimens are 

 also found. Through Prof. Ottmer of Brunswick I have ob- 

 tained a number of specimens which leave no doubt that 

 Limnorea centrolcevis, Rom., is united by all transitions with 

 simple individuals of the form of Gonoccelia crassa, From. 



The two species at present known are from the Lower 

 Cretaceous. 



1. Siphonoccelia crassa, From. Cat. Rais. pi. i. fig. 1. 



2. Limnorea centrolcevis, Rom. Spongit. Taf. i. fig. 18. 



EUSIPHONELLA, Zittel. 



Scyphia, Goldf. 



Siphonocoelia and Disccelia p. p., From. 



Pareudea p. p., Etal. 



Sponge simple or branched by basal or lateral budding. 

 Individual persons cylindrical, narrowed below, thin-walled, 

 with a wide tubular or tunnel-shaped stomachal cavity ex- 

 tending to the base. Wall of the stomachal cavity with 

 elongated ostia standing in vertical rows and serving as the 



