BRITISH PAL^OGENE BEYOZOA. 239 



0. magnoajjerta is closely allied to some Upper Cretaceous species ; of these 0. cyclo- 

 stoma (Goldf.) [Eschara cyclostoma, Goldfuss, 'Petrefacta Germanise,' Th. i. 1826, p. 23, 

 pi. viii. fig. 9] appears to be about the nearest ; the evidence for referring it to Onycho- 

 cella is given by von Hagenow's figures [No. 2, p. 75, pi. ix. figs. 7, 8, pi. xii. fig. 3] : 

 from this, which is biflustrine in habit, it may be distinguished by its clithridiate 

 aperture; the avicularian cells agree in general character. From O.koninchiana (Hag.) 



Cellepora {Discopora) konmcMana, Hag. ib. p. 95, pi. xi. figs. 10, 11] it differs in the 

 ovate shape of the avicularian cells, which in the Maastricht species are lanceolate. 

 0. santonensis, D'Orb. [Eschara sanfonensis, D'Orbigny, No. 2, p. 109, pi. 673. fig. 4], 

 agrees with it in the large size of the aperture and the shape of the avicularia ; but the 



ocecia in that species are pyriform, the lamina larger, and the lower side of the mouth 

 straight. 0. drya, D'Orb. [Eschara drya, ib. p. 168, pi. 677. figs. 7-9], has also a large 

 aperture, but this is much wider and not clithridiate ; the zocecia are also diff'erent in 

 shape. D'Orbigny has figured amongst his Escharas a large series of species which 

 must be referred to Onychocella, though many of them may be reduced to synonyms. 



rom most of them, such as 0. allica (D'Orb.), 0. archosia (D'Orb.), 0. charonia 

 (D'Orb.), 0. clito (D'Orb.), and 0. cressida (D'Orb.), the new species may be distin- 

 guished by its large aperture. 



The occurrence of the genus Onychocella in Cretaceous rocks has been frequently 

 pointed out ; the British Museum Collection contains a specimen from the Calcaire 

 apolypiers (Bathonian) of Ranville, that must be referred to this genus. 



Suborder SCHIZOTHYRIATA. 



Family SCHIZOPORELLIDtE. [Myriozoidm of Hincks.) 

 Genus Schizopoeblla, Hincks. 

 Diagnosis. See Hincks, No. 2, p. 237. 



Species 1. Schizoporella magnoaperta, n. sp. 



Diagnosis. Zoariwn, a foliaceous expansion. 



Zocecia somewhat irregularly arranged, though with a tendency towards quincuncial. 

 In shape they are pyriform, well rounded above, tapering below. The front wall is 

 tumid, forming a raised triangular area. A raised lip around the orifice, which is oval ; 

 the sinus is median, small but distinct. The zocecia are separated by a depressed flat 

 margin, around which is a row of large deep areolae. 



Avicularia one on each zocecium, beside and below the orifice ; they have raised, 

 elliptic borders. 



Ocecia ? 



Distribution. Barton Beds, Barton. 



