BRITISH PAL^OGENB BETOZOA. 261 



Distribution. London Clay, Sheppey. 



T^pe. Brit. Mus. No. B 4509. 



Fifftores. PI. XXXII. figs. 10 a, 10 b. 



Affinities. The specimen which serves as the type of this species is that which 

 Mr. Vine figured as Idmonea gracillima, Reuss, but as it belongs to a different family 

 there is no necessity to compare it with that species. It reminds one, in the form of 

 the zoarium, of Entalophora clavula, Reuss ^ ; from this it differs in the serial 

 arrangement of the apertures. The same character separates it from Entalophora pal- 

 mata. Busk ^. 



This species seems to me to be most allied to Entalophora tvanganmensis, Waters 

 (No. 5, pp. -340, 341, pi. zviii. fig. 1) : but the New Zealand species has only 10 zooecia 

 in a series ; these are verticillate, and the zooecia are not infundibuliform. 



Family HETEROPORID^. 



Genus Hetekopoka, Blainville, 1830. 

 [Blainville, No. i, p. 381.] 

 Diagnosis. Pergens, No. 3, p. 369. 



Species 1. Heteeopoea glanbifoemis ^, n. sp. 



Diagnosis. Zoarium very small, globular, free (the largest specimen is less than 

 3 millim. in diameter). 



Zooecia irregularly bent tubes. The orifice varies from orbicular to subhexagonal in 

 shape ; they are surrounded by a strong raised rim. The zooecia are crowded, but 

 interzooecial spaces occur on the surface of the zoarium ; these are, however, entirely 

 filled in the interior. Secondary pores numerous, somewhat less in number than the 

 normal zooecia, irregularly scattered ; they also have a thickened, slightly raised rim. 



Distribution. Barton Beds, Barton (common). Bracldesham Beds, Bracklesham Bay. 

 "? London Clay, Highgate. (One somewhat doubtful specimen: Brit. Mus. No. 49596.) 



Type. Brit. Mus. No. B 4511. Edwards Coll. 



Figures. PI. XXXII. fig. 11. A zoarium from Barton ; external view. Figs. 

 12 o, b. Fragments to show internal structure. 



Affinities. In the form of the zoarium this species resembles most closely some 

 specimens of Heteropora conifera (Lamx.) [No. 2, p. 87, pi. 83. figs. 6, 7 ; see Haime, 

 No. I, pp. 208, 209, pi. xi. figs. 1 a-c], figured by Haime, but the zooecial characters are 

 quite distinct. H. stellulata, Reuss (No. i, p. 35, pi. v. figs. 21, 22 ; Manzoni, No. 4, 



' Pustulipora clavula, Keuss, No. i, p. 41, pi. vi. fig. 11. For later figures see Reuss, No. i, p. 194, pi. is, 

 figs. 3, 4. 



'^ Pu^Udopora pahnata, Busk, No. 6, p. 108, pi. xviii. fig. 2 ; and Manzoni, No. 4, p. 11, pi. is. fig. 34. 

 ' From glans, a bullet. 



2p2 



