240 MR. J. W. GREGORY ON THE 



Type. Brit. Mus. No. 49733. Edwards Coll. 



Figures. PI. XXX. fig. 9. Part of a zoarium from London Clay, Sheppey ; Brit. 

 Mus. No. B 4514, X i diam. 



Affinities. This species belongs to the group of which the common Schizoporella 

 unicornis, Johnst., is a good representative; it agrees with the latter in its umbo, sub- 

 orbicular mouth, and small sinus. From that species, however, it clearly differs in the 

 much larger size of the aperture and the pyriform shape of the zocecia in the new species, 

 in which also the umbo is lower down, and there is one lateral avicularium instead of 

 the pair usually present in jiS. nnicornis ; the areolae are also limited to a single series. 

 The large size of the aperture at once distinguishes this from most of the Continental 

 Miocene and Lower Cainozoic species, such as S. goniostoma \Cellepora goniostoma, 

 Keuss, No. I, p. 87, pi. x. fig. 18; for better figures see Reuss, No. 14, p. 176, pi. ii. 

 fig. 6, pi. iii. fig. 3] and *S'. rvgiUosa [Reuss, No. 14, p. 169, pi. iii. fig. 2]. S. dunkeri 

 [Reuss, No. I, p. 90, pi. x. fig. 27] agrees in some respects, e. g. the single lateral 

 avicularium, the large mouth, and blunt umbo ; it is probably the nearest ally of this 

 species. Reuss's species may be distinguished by its higher umbo, marginal avicularia, 

 and shorter and more rectangular zocecia. Among recent species it agrees closely 

 with tS. simplex D'Orb. [Eschara simplex, D'Orbigny, No. i,p. 13, pi. v. figs. 5-8], 

 from which it differs in the pyriform shape of the zocecia. 



In the general form of the zocecia this species agrees strikingly with Microporella 

 memhranacea (Reuss) [Eschara memhranacea, Reuss, No. 6, p. 32, pi. v. fig. 6], from 

 Oberburg ; the possession of a sinus instead of a trypa, of course, distinguishes it from 

 that species. 



Species 2. Schizoporella magnoincisa, n. sp. 



Diagnosis. Zoarium foliaceous. 



Zocecia narrow and elongated ; peristome raised and almost subtubular. Aperture 

 large and with a very large sinus ; the angles of the peristome above the sinus vary 

 considerably in prominence, but never meet. One line of areolae. Front wall smooth 

 and evenly convex. 



Avicularia: one on each zooecium, just below the aperture; lateral in position ; 

 mandible pointing upwards to the angle between the apertui'e and sinus. 



Ocecia (none 1). 



Distribution. London Clay, Copenhagen Fields. 



2'ype. Brit. Mus. No. B 4515. Fragment enclosed in a septarian nodule. 



Figure. VI. XXX. fig. 10, x 30 diam. 



Affinities. The large size of the sinus of this species would necessitate its inclusion 

 in Gemellipora if that genus of Smitt's [No. 3, p. 35] be accepted. Its nearest ally 



