M. K. A. Zittel on Fonail Lithistidm. 469 



*1. Eudea intumescens, Rom. Spong. xi. 1, Cuvien-YlsMQX ; 

 Quenst. Petr. cxxxiii. 23-26. 



*2. CyUndrospo7igiaheteromorphajlX'6Yi\. 'ih.Yiu. 11. Cuvieri- 

 Planer. 



3. Scyphia heteromorj>ha, Rom. Kr. ii. 3. QuadratuS' 

 chalk. 



*4. PhymateUahulbosa,Zitt., sip.n. Polymorphous, strongly 

 thickened and furnished with nodular excrescences at the 

 base, stalkless. Central cavity of various widths. Tolerably 

 frequent in the Quadratus-chaXk. of Biewende and in the 

 Alucronatus-chalk of Ahlten. 



5. Spo7igites plicatuSj Quenst. Petr. cxxxiv. 1, 2. Planer, 

 Oppeln. 



6. Spongites tuberosus, Quenst. ib. p. 388, cxxxiii. 18-20. 

 Senonian. 



7. Hippalimus lohatus, Rom. Spong. x. 1. Senonian. 



8. '^Hippalimus depressus, Rom. ib. x. 2. Senonian. 



*9. Siphonia elongata, Reuss, Kr. xxxiv. 1. Cenomanian. 

 *10. 1 Actinospongia dichotoma, Rom. Spong. xix. 4. Cu- 

 vieri-V\?intv . 



11. Scyphia trilohata, Mich. Ic. xxviii. 2. Cenomanian. 



12. 8cypMa atteniiata, Court. Ep. v. 2. Senonian. 



13. Scyphia perforata., Court, ib. v. 3. Senonian. 



14. Scyphia conica, Court, ib. v. 7. Senonian. 



Also, perhaps, Scyphia echinata^ mammillatay sphcBrica, 

 coronata, digitata^ Court, ib. pi. vi. Senonian. 



AULAXINIA, Zitt. 

 Siphonoccelia p.p., Rom. 



Sponge from elongate-pyriform to cylindrical, stalked. 

 Vertex with a very shallow broad depression, from which run 

 strong furrows, passing down the sides of the sponge to the 

 beginning of the stalk. Interspaces about equal in breadth to 

 the furrows, with rows of round ostia, from which canals 

 penetrate into the dense sponge-body. Root without ostia, 

 generally simple. 



Body-skeleton like that of Phymatella. Forked anchors 

 with long shafts and large bacillar spicules seem to indicate 

 a special surface-layer. The root consists of very irregularly 

 distorted quadriradiates, in which one arm is elongated and 

 contains the axial canal ; towards the lower end of the stalk 

 the surface is covered with very long fibres, having numerous 

 short lateral branches (PL VIII. fig. 2). In these, also, the 

 axial canal is short and closed at both ends. 



