The Genus Porosphccra, Steimnanu. By George J. Hinde. 3 



another (fig. 11) is named Lunulitcs uvccolata, Lam. Both speci- 

 mens are partly imbedded in a slab of hard chalk from Dane's 

 Dike, Flamborough, now preserved in the York Museum. Stein- 

 mann has taken the first of these as the type of the genus Poro- 

 sphccra, whilst the Lunulitcs urccolata is now known as Porosphccra 

 pileolus. No description accompanied either of the forms figured 

 by Phillips. In the third edition of the Geology of Yorkshire, 

 which appeared in 1875, both Millcpora globidaris and Lunulitcs 

 urceolata are placed in the genus Coscinopora, Goldfuss, but here 

 again no description is given ; the specific name of the latter is, 

 however, changed to pileolus. 



In 1833, S. Woodward figured in the Outline of the Geology of 

 Norfolk, pi. iv., figs. 10-12, several examples of Millcpora globidaris 

 from the Chalk of Norwich and near Holt, which are placed with 

 other fossil sponges under the heading Polypi. It is doubtful if 

 the Lunulitcs urceolata, pi. iv., fig. 9, belongs to Porosphccra. I 

 have not been able to trace the originals of the figures. 



In 1839, F. von Hagenow described and figured in the ' Mono- 

 graphic der Rugenschen Kreide Versteinerungen ' {Neues Jahrbuch 

 filr Mineralogie), as a new species of Polyzoa, Ceriopora nuciformis, 

 the same pear-shaped forms of Porosphccra which had been already 

 figured by Mantcll in 1822. He regarded them as a more com- 

 plete development of the rounded forms, i.e. of P. globidaris, Phill. 

 sp., though he does not mention this species (p. 286, pi. v., fig. 9). 

 In the same work (p. 2(30) a description is given of another 

 rounded fossil from the Chalk of Eiigen, named Achilleum globoswm, 

 which appears to have been partly based on specimens of P. glohu- 

 laris, and partly on small round siliceous sponges subsequently 

 named by v. Zittel, Plinthosella squamosa. 



In 1844, A. E. Pteuss, in Geognostische Skizzcn aus Bohmcn, 

 vol. ii., p. 140, quoted Ceriopora pisum = Millcpora globidaris, Phill., 

 from the Pliinerkalk of Kutschlin and near Bilin ; and shortly 

 after (1845-6), in Die Versteinerungen der bohmischen Kreide- 

 formation, Abth. 2, p. 78, pi. xx., fig. 5, he described and figured 

 the same form as a sponge under the name of Tragos globidaris. 



In A. d'Orbigny's Prodrome de Pcdeontologie, vol. ii. (1850) 

 p. 284, Tragos globidaris, Reuss ( = P. globidaris, Phill.) is placed 

 in the genus Coscinopora, Goldfuss. 



John Morris, in the second edition of the Catalogue of British 

 Fossils (1854) pp. 27, 28, follows d'Orbigny in placing P. globidaris 

 under Coscinopora, and to the same genus he refers Lunulitcs, 

 Mant., L. urccolatus, Phill., and Orbitolitcs lenticulccta, Mant. These 

 forms are placed with a query as synonyms of Lamarck's species 

 (0.) pileolus. 



In the Ann. and Mag. Nat. Hist,, s. 3, vol. vi. (1860) p. 30, 

 W. K. Parker and T. E. Jones described P. globidaris, Phill. sp., 

 as a Foraminifer, and placed it in the genus Orbitolina, d'Orbigny, 



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