260 MR. J. W. GEEGOET ON THE 



Species 1. Hornera farehamensis, n. sp. 

 Syn. Hornera ramosa, D'Orb., G. R. Vine, 1891, Proc. Yorks. Geol. & Polyt. Soc. xii. pp. 54-56. 



Diagnosis. Zoarium thick, dichotomously branching tufts ; the branches do not 

 anastomose. 



Zooecia open somewhat regularly on the anterior side ; the orbicular apertures form 

 straight lines around the branches. In the middle line there is often an irregular and 

 crowded series. The apertures are flush. The interzooecial pores are of medium size, 

 but not very abundant, numbering from twice to thrice as many as the zooecia. The 

 posterior side of the zoarium is deeply perforate, the punctures occurring in simple 

 series, occasionally branching. 



Distribution. London Clay, Fareham. 



Ty^pe. Brit. Mus. No. B 3831. 



Figures. PI. XXXII. figs. 7-9. 



Affinities. This species has been identified by Mr. Vine as H. ramosa, D'Orbigny 

 [No. 1, pp. 937, 938, pi. 608. figs. 6-10, pi. 773. figs. 1-3] ; from that species it appears 

 to me to diff'er by the following characters : (1) the sections of the branches are round 

 and not subtriangular ; (2) the central series of zooecial apertures are very irregularly 

 distributed ; (3) the species figured by D'Orbigny has the exceptional character of a 

 series of tubular prominences probably zooecial (see pi. 773. fig. 2); (4) the zoarium is 

 irregularly branched and does not form the cupuliform structure shown by D'Orbigny 

 (pi. 608. fig. 6). 



The nearest ally of this species appears to me to be Hornera concatenata, Eeuss 

 (No. II, pp. 71, 72, pi. xxsv. figs. 5, 6), but in that species the pores on the back are 

 few and far between, the number of zooecia in a transverse series is less, the pores on 

 the front wall are much less numerous, and there is no irregular middle series. 



Genus Entalophora, Lamouroux, 1821. 

 [Lamouroux, No. 2, p. 81.] 

 Diagnosis. Pergens, No. 3, p. 357. 



Species 1. Entalophoba tergemina 1, n. sp. 



SyD. Idmonea graciUima?, Reuss, Vine, 1889, Prcc. Yorlis. Geo], & Polyt. Soc. vol. xi. pp. 165, 

 166, pi. V. fig. 13. 



Diagnosis. Zoarium thick, apparently short. In section it appears quadrangular, 

 with the angles well rounded. Surface minutely pitted. 



Zooecia crowded, long, expanding above ; series of three or four open together along 

 a straight line ; there are four such triplets at not quite the same level in a series 

 around the zoarium. There are 12 or 13 in a complete series. The zooecia are some- 

 what infundibuliform, and have a somewhat quadrangular aperture. 



1 Tergmiinus, triple, referring to the apertures being usually in triplets. 



