ETJDEA. . 161 



Sestrostomella, the Jurassic species of Stellispongia, Trachysinia, Oculospongia, Dia- 

 plectia, and Elasmostoma. In a third type, less clearly marked than the two pre- 

 ceding, the fibres are of a slender character, and mainly consist of relatively large 

 three- and four-rayed spicules, either heterogeneously mingled or sometimes disposed 

 in a single series. This structure is developed in Li/mnorea, some Jurassic species of 

 Peronella, and in Inobolia. It may be named the Lymnorea type. In a fourth type 

 the fibre consists of uniaxial spicules arranged parallel to each other in the direction 

 of the fibre. No three-rayed forms appear to be present. The only genus in which 

 this structure exists is Pharetrospongia. 



So far as the material at my disposition has permitted, I have endeavoured to 

 determine the spicular structure of the various species in the collection, but it will 

 require much more extended observations before a natural arrangement of this family 

 can be satisfactorily established. 



Note. — Since the first portion of this work was in type, the acquisition of fresh 

 specimens of Calcareous sponges has enabled me to make several additions to the 

 list of genera given on page 17. 



Genus EUDEA, Lamx. 1821. 



EuDEA Manon, Miinst. sp. 



1841. Scypkia? Manon, Miinst. Beitr. zur Petref. iv. p. 29, t. 1. f. 15. 



1864. Epeudea Manon, Laube, Deuks. d. k. Akad. d. Wiss. Bd. 24, p. 231, t. 1. f. 2 a, b. 



1878. Eudea Manon, Zitt. Studien, III Ab. p. 27. 



1878. Scyphia Manon, Quenst. Petref. Bd. 5, p. 540, 1. 140. f. 31. 



Distribution. Trias : St. Cassian Tyrol {coll. Klipstein). 



Eudea polymoepha, Klipst. sp. 



1843. Scyphia polymorpha, Klipst. Beitr. z. g. Kennt. d. ost. Alpen, p. 284, 1. 19. f. 12 a, b, c. 

 1864. Verrucospongia polymorpha, Laube, Denks. d. k. Akad. d. Wiss. Bd. 24, p. 236, 



t. 1. f. 12. 

 1878. Eudea polymorpha, Zitt. Studien, III Ab. p. 27. 



1878. Scijphia polymorpha, Quenst. Petref. Bd. 5, p. 550, t. 140. f. 53. 



1879. Eudea polymorpha, Zitt. Neues Jahrbuch, p. 21. 



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



EtJDEA clavata, Lamx. 



1821. Eudea clavata, Lamx. Expos, method, p. 46, t. 74. f. 1, 2, 3, 4. 

 1834. Eudea clavata, Blainv. Man. d'Actin. p. 539, t. 64. f. 3, 3 a. 

 1847. Eudea cribraria, Mich. Icon. Zooph. p. 25, t. 58. f. 8. 



