336 Messrs. Young on a neia Genus 



for at that time we had not recognized the differences based 

 on the presence of one or more layers of cells." — D'Oebigny, 

 PaUontologie Frangaise, v. p. 1029 (1850-52). 



" Ceriopoea, nobis. {AlveoUtce species, Lam.) 



" Polypary stony, sessile or affixed, composed of several 

 concentric layers of cells enveloping each other ; cellules 

 tubular or subprismatic, subcontiguous, parallel or divergent." 

 — GOLDFUSS, Petrefacta Germanice, p. 32, 



At page 244 the polyp-cells of these corals are described as 

 round short tubes which have neither transverse nor vertical 

 lamellaj, neither a siphon nor lateral connecting tubules. They 

 sometimes lie parallel and immediately in contact with each 

 other, and press on each other so as to appear obscurely pris- 

 matic; sometimes they diverge. Their apertures are equal 

 in diameter to the tubes, and are seldom consti-icted or dilated. 

 The polypary enlarges by the concentric superposition of new 

 layers. The branches of this mass are likewise made up of 

 several layers. 



Pictet (' Traite de Paleontologie,' 1857, iv. p. 154) places 

 Ceriopora under the family Tubuliporides, tribe Foramines — 

 among those, therefore, which have the cells pierced in the 

 common calcareous mass, and not salient. He considers this 

 genus one which should rather be abolished than restricted. 

 His definition is, " they form colonies composed of equal or 

 nearly equal cells united by their margins, and not prolonged 

 into tubes." 



" Ceriopora, Goldfuss. 



" Polypidom tuberose, composed of numerous thin concentric 

 layers ; pores round, unequally placed. 



" This genus was intended by Goldfuss to include several 

 fossil forms now referred to Alveolites^ Chrysaora, &c. The 

 above definition is of the genus as now restricted." — M'COY, 

 Palceozoic Fossils, p. 194. 



" Millepora. — Pores very minute, perpendicular to the 

 surface ; cells without lam elite." — rbid. p. 195, 



Phillips places Millepora^ along with Fenestella^ Glauconome, 

 &c., among the Polypiaria, along with Favosites and the other 

 true corals. 



Morris (' Catalogue of British Fossils,' edit. 1854) puts Ce- 

 riopora, Goldfuss, 1826, in the Bryozoa, and gives C. gracilis 

 and C. interporosa under that generic heading, Millepora being 

 among the Zoophytes. 



Amid this confusion it is apparent that Pictet's suggestion 



