ON FOSSIL POLTZOA. 159 



Family HOEXERiDiE. 

 Horxera, Lamx. 



22. Horxera lichenoides, Linn. =Ecrn era borealis, Busk ' Crao- 



Pol.' pp. 95 and 103. 



Family Lichexopoeid;e. 

 Discopoeella, Gray. 



23. Discopoeella vereucaeia, Linn., Fabr. =T)iscocavea, D'Orb. 'Pal. 



Fr. T. Cret.' v. p. 958=Unicavea convexa, D'Orb. 'Pal Fr T 

 CreV v. p. 972. 



24. Discopoeella ceassiuscula, Sm.=Tubnlipora Grignouensis, Busk 



Crag Pol.' p. 116 ( non M.-Edw.) = Defranciarugosa, Busk (?) 

 I. c, p. 118. 



25. Discopoeella hispida (Flem.) = Liclienopora mediterranean Mich. 



' Icon. Zoo.' p. 68=Unicavea, D'Orb., 'Pal. F. T. C p. 971 = Vis- 

 cocavea acideata, D'Orb., 'Pal. Fr.' 7. c, p. 95B=Eeteroporella 

 radiata, Busk, ' Crag Pol.' p. 127. 



II. Fascictlixea, D'Orb. Family Feoxdipoeid.e. 

 Froxdipoea, Blainv. 



26. Froxdipoea (a) reticulata, Linn.= Frmdipora ibid., D'Orb ' Pal 

 Fr. T. C v. p. 677. ' 



Froxdipoea (/3) reticulata, IAxm.= Froudmora verrucosa, D'Orb ' Pal 

 Fr. T. C v. p. 678. ,' 



Family Cortmboporidj:. 

 Coeymbopoea, Mich. 



27. Coeymbopoea fungiforms, Sm. = Fimgella proUfera, Hag. (?) 



'Mast. Kreid.' p. o7=Fasciculipora, D'Orb. 'Pal. Fr. T. C v. 

 p. 668= Fimgella quadriceps, Busk (?), ' Crag Pol.' p. 119. 



Defeaxcia, Bronn. 



28. Defeaxcia luceexaria, Sa,v.=Discofascigera cupula, D'Orb. (?) 



I. c, p. 675. 



I would strongly advise the student of Fossil Cyclostomata to com- 

 pare the species named, if in his power to do so, or contrast at least 

 the lists given in this report from Hincks, Busk, Hagenow, and 

 Reuss. It will be seen what different estimates are given of Zoarial 

 characters by the different authors. The multiplication of species is un- 

 avoidable if we take into consideration habit only. In Smitt's list given 

 above, the author certainly deserves the thanks of workers for his 

 endeavour to combine leading facial characters in his simple Family 

 arrangements, and I think I may venture to say that Smitt's Generic 

 combination embraces all, or nearly all, the structural features that may 

 be found m the study of this peculiar sub-order of the Polyzoa. It may 

 be, however, quite possible to give simplicity of arrangement too wide a 

 scope. (See Hincks and Busk on the Cyclostomata). 



Dr. August Goldfuss, ' Petrefacta Germania?,' 1826. 

 The ' Zoophytorum Reliquiae ' of Goldfuss were classed under fortv-five 

 genera, and the genera Eschaea, Cellepoea, Betepoea, and Ceeiopoea— 



