196 Dr. J. W. Gregory — A Revision 



Diagnosis. — Zoarium of thin regularly cylindrical branches, 

 composed of about twelve zooecia. Branches 1 to 2 millim. 

 in diameter. 



Zooecia long, cylindrical, with only a small portion free. 

 Apertures irregular in distribution, distant. Surface wrinkled. 



Distribution. — England: MidLias — GreatOolite. Foreign: 

 Bajocian, France? 



3. Entalophora nidulata (Walford), 1894. 



Pergensia nidulata, Walford, 1889, Bry. Shipton, Part II., Quart. 

 Journ. Geol. Soc. vol. 1. p. 73, pi. ii. tigs. 1, 2. 



Pergensia major, Walford, 1894, ibid. p. 74, pi. ii. figs. 3, 4. 



Pergensia porifera, id. ibid. p. 75, pi. ii. fig. 6. 



Pergensia galeata, id. ibid. p. 76, pi. iii. fig. 27. 



Pergensia minima, id. ibid. p. 74, pi. ii. fig. 12. 



Entalophora riehmondiensis, var. pustulopora, Vine, 1884, Polyz. Rich- 

 mond Boring, Quart. Journ. Geol. Soc. vol. xl. p. 792. 



Diagnosis. — Zoarium short, clavate, cylindrical in section. 



Zooecia cylindrical, partly immersed, but a free distal 

 portion, the extent of which varies greatly. The apertures 

 are irregularly arranged, but a tendency to a spiniform 

 arrangement occurs in the proximal portion of the zoarium. 



Ooecia large, spherical. 



Distribution. — England : Inferior Oolite and Great Oolite. 



Genus 2. Spiropora, Lamouroux, 1821. 



Diagnosis. — Entalophoridaj in which the apertures in most 

 parts of the zoarium occur in regular annular or spiral lines. 

 The zooecia are regularly cylindrical. 



Type species : Spiropora elegans, Lamouroux, 1821. 



1. Spiropora elegans, Lamouroux, 1821. 



Spiropora elegans, Lamx. 1821, Expos, meth. p. 47, pi. lxxiii. 



figs. 19-22. 

 Cricopora elegans, Blainville, 1830, Diet. Sci. nat. t. lx. p. 385. 



Diagnosis. — Zoarium formed of loose tufts ; branches 

 dichotomize repeatedly, rather stout. 



Zooecia long, regularly tubular. 



Peristomes slightly elevated, arranged in regular horizontal 

 rows; from 5 to 7 peristomes are seen on each side of a 

 branch ; the rows of peristomes are distant, the zocecia being 



lon s- 



Distribution. — British : Great Oolite. Foreign : Ba- 

 thonian, France. 



