186 CALCAEEOUS SPONGES. 



1843. Cnemidium concinnum, Klipst. ib. p. 292, t. 20. f. 7 a, b. 

 1878. Stellispongia variabilis, Zitt. Studien, III Ab. p. 40. 



1882. Stellispongia variabilis, Steinm. Neues Jabrb. Bd. 3, p. 180, t. 9. f. 2. 



The fibres, in a transparent microscopic section, appear as well-defined anastomosing 

 bands about -1 mm. in width; no structure could be distinguislied. According to 

 Steinmann they are composed of short, simple, sinuous spicules. 



Distribution. Trias : St. Cassian, Tyrol [coll. Klipstein). 



Stellispongia htbrida, Miinst. sp. 



1841. Traffos hybridum, Miinst. Beitr. zur Petref. iv. p. 29, t. 1. f. 16. 

 1878. Stellispongia hybrida, Zitt. Studien, III Ab. p. 40. 



Distribution. Trias: St. Cassian, Tyrol (coll. Klijjsfein). 



Stellispongia stellata, Lamcc. sp. 



1821. Spongia stellata, Lamx. Exp. metbod. p. 89, t. 84, f. 13. 

 1840—47. Spongia umbellata, IMicb. Icon. Zooph. p. 248, t. 58. f. 1 a, b. 

 1851. Spongia stellata, Morris, Cat. Brit. Foss. p. 30. 

 1878. Stellispongia stellata, Zitt. Studien, III Ab. p. 40. 



1883. Non Stellispongia stellata, Dunik. Pal. Bd. 29, p. 38, t. 40. f. 5. 



The spicular structure of the fibres of this species is clearly of the Sestrostomella 

 type. The fibres are from 'lb to "24 mm. in thickness, and are composed of rela- 

 tively large irregular three- and four-rayed spicules, with rays from "3 to 'SS mm. 

 in length. These spicules occupy the central portions of the fibre, and they are 

 surrounded by smaller sinuous, apparently three-rayed, spicules, which form the 

 exterior borders. 



Distribution. Middle Jura: Couche a polypiers — Langrune, Eanville, near Caen 

 [coll. Tesson). Great Oolite : Hampton Cliff", near Bath [Morris). 



Stellispongia corallina, From. sp. (Plate XXXV. figs. 3, 3 a, 3 b.) 



1859. Enaulofungia corallina, From. Introduc. k I'Etude des Ep. fossiles, p. 48, t. 3. 



f. 11, 11a. 

 1859. Enaulofungia globosa, From. ibid. t. 4. f . 3. 



1840-47. Cnemidium rotula, Micb. (non Goldf.) Icon. Zoopb. p. 115, t. 26. f. 7. 

 1859. Astrospongia corallina, Etallon, Letb. Brunt, p. 424, t. 59. f. 8, 9. 

 1878. Stellispongia corallina, Zitt. Studien, III Ab. p. 40. 



Sponges usually simple, though sometimes two or three individuals are amalga- 

 mated together, subspherical, growing ajjparently free or attached to some other 

 organism. The individuals vary from 9 to 21 mm. in diameter. The summit is 

 generally slightly depressed in the centre, from whence several well-marked open 

 canals, "6 to 1'25 mm. in width, radiate down the sides. 



