310 EEPORT— 1892. 



42. Spiropora verfcicillata (?), Goldf. = Idmonea Gom'ptoniana (?), 



Mantell's ' Medals,' vol. i., p. 284, woodcat 64, fig. 14. 



I am rather doubtful about the forms in the Chalk of Chatham, The 

 fragments, however, are closely allied to this species. 



43. Spiropora macropora, d' Ovh.=Laterotuhigera, id., d'Orb., ' Terr. 



Cret.,' p. 718, pi. 754, figs. 5-7. 



44. ,, micropora, d'Orb. =^Laferotubigera, id., d'Orb., I. c, p. 



719, pi. 754, figs. 12-14. 



45. „ Cenomana, d'Orb. (?), I. c, p. 715, pi. 618, figs. 11-15. 



1847. Genus Bidiastopora, d'Orb., ' Terr. Cret./ p. 798 ; 

 Perg., ' Eevis.,' p. 367. 



46. Bidiastopora Mari«, d'Orb., Z. c, p. 804, pi. 755, figs. 13-15. 



47. ,, lamellosa (?), d'Orb. (Elea), I c, p. 632. 



1852. Genus Sulcocava, d'Orb., 'Terr. Cret.,' p. 1020. 



48. Sulcocava sulcata ? d'Orb., I. c, p. 1020, pi. 789, figs. 1-3. 



1850. Genus Petalopoea, Lonsdale, Dixon's ' Geol. Sussex,' p. 285. 



\_Zoarium'] ' Tubular, free except at the base ; framework [^rMcecia] 

 composed of vertical lamince, with an intermediate, foraminated structure ; 

 apertures to the visceral or tubular cavities distributed over the whole 

 surface . . .' 'Geol. Sus.,' p. 2Sh, = Cavea (pars), d'Orb., 1852, 'Terr. 

 Cret.,' p. 941. 



49. Petalopora pulchella (Romer), Lonsd., ' Geol. Sns.,' p. 285, pi. 

 18a, figs. 7, 7a, &c. 



Under the name Heteropora cosiata, d'Orb., Dr. Pergens places several 

 of the Gavea, species of d'Orbigny. As I cannot wholly accept this divi- 

 sion, I give Lonsdale's genus in preference, especially so as neither 

 d'Orbigny nor Dr. Pergens seems to recognise the prior claim of Lonsdale : 

 Petalopora, Lonsdale, 1850; Cavea, d'Orbigny, 1852. ^ In the Chatham 

 Chalk I recognise several fragments of a species similar to the above, 

 so we may regard the synonymy of Dr. Pergens as near the truth ; 

 thus Gavea costata, d'Ovh. = Petalopora pulchella (?), may be regarded 

 as a synonym of Lonsdale's species. One difficulty, however, presents 

 itself. Gavea costata, d'Orb., 1852, is regarded by the author as the same 

 as Entalopkora costata, d'Orb., 1850, 'Terr. Cret.,' p. 944, pi. 621, 

 figs. 19, 22. Probably d'Orbigny is correct in his later identification ; 

 but, if so, there is no clear evidence of the characters — so fully described 

 by Lonsdale — in his figures. I therefore think that Lonsdale's name 

 should stand, and that the following forms, characterised by d'Orbigny, 

 be regarded as synonyms. I have ijiven the names of those species only 

 which I have been able to identify from fragments found in the Chatham 

 Chalk. For the sake of uniformity I liave given all the synonyms sepa- 

 rate numbers, as other woi-kers on the Cretaceous Polyzoa may not be 

 inclined to accept my decision on this point : — 



' See Dr. Pergens, Bevis. des Bryoz., pp. 369-372. 



