BEITISH PALiEO&ENE BETOZOA. 237 



and in other features. From the common and widely distributed C. radiata [Moll, No. i, 

 p. 63, pi. iv. fig. 17] this species differs by its larger orifice and by the furrows being 

 more numerous and differently arranged. Among recent species it most closely resembles 

 C. philomela. Busk [No. 8, pp. 132-3, pi. xvii. fig. 6, pi. xxii. fig. 7], to which it is allied 

 by the large size of the orifice and the big globose ocecia ; it differs, however, in the 

 ocecia being plain in the recent species, and also in having more pores on the furrows 

 and none in the middle line. 



Probably the nearest ally to this species is Crilrilina manzonn [Lepralia manzonii, 

 Eeuss, No. 14, p. 171, pi. i. fig. 6], from Modling, near Vienna, which agrees with it in 

 the large size of the orifice and the arrangement of the furrows : Eeuss does not figure 

 any ocecia, and consequently this important character cannot be used for comparison ; 

 but the absence of the pair of large lateral avicularia and the greater number both of 

 pores and furrows in C. manzonn are suflficient to distinguish the two. 



The species belongs to CribriUna, even restricted as narrowly as is done by 

 Dr. JuUien [No. 3, 604]. 



Family MICROPORID.^. 



Genus Miceopoka. 

 Diagnosis. Hincks, No. 8, pt. i. p. 161. 



Species 1. Miceopora ceibeifoemis, n. sp. 



Syn. Membranipora holostoma, Busk, var. perforata, G. R. Vine, 1891, Proc. Yorks. Geol. & Polyt. 

 Sec. vol. sii. p. 60. 



Diagnosis. Zoarium encrusting. 



Zocecia oval, sometimes tapering below. The lower part of the front wall is very 

 tumid and rises above the raised margin. The aperture is small ; the upper margin is 

 regularly curved, the lower margin sinuous. The front wall is crowded with maculae, 

 which are very irregular in form and numbers. There is usually a pair of narrow slit- 

 like opesiulse situated at the extreme margin of the ocecia, just below the corners of 

 the aperture. 



Distribution. Barton Beds, Barton. 



Type. Brit. Mus. No. B 4583. 



Figures. PI. XXX. fig. 6. Part of zoarium. In one of the zocecia the front wall has 

 been broken away and shows the absence of internal partitions. 



Affinities. This species is very clearly marked by the sinuous lower border of the 

 aperture and the cribriform aspect of the whole front wall. Both characters, as well 

 as the form of the zocecia and other less important points, separate it from M. holostoma 

 (Busk) [No. 6, p. 36, pi. iii. fig. 11], from the Crag. 



Probably the most nearly allied species is M. gracilis (Miinst.) [Cellepora gracilis, 



2m2 



