270 
Mr. A W. Waters on the 
dea with the zooeeia on the front only, we should have the 
present species. 
104. Discoporella radiatn , Aud. (PI. XXIV. fig. 11.) 
Melobesia radiatn, Aud. in Sav. Egypte, p. 60, pi. vi. fig. 3. 
Discoporella fiosadus, Ilincks, Ann. & Mag. Nat. Hist. ser. 3, vol. ix. 
p. 468, pi. xvi. fig. 3. 
Discoporella radiata, Busk, Mar. Polyz. pt. iii. p. 32, pi. xxxiv. fig. 3. 
? Discoporella Houldsworthii, Busk, loc. cit. p. 33, pi. xxx. fig. 4. 
Discosparsa patina, Heller, Die Bry. des Adr. p. 122. 
?Discocavea acvleata, D Orb. Pal. Fr. p. 958, pi. 776. figs. 5, 8. 
Discoporella, sp., Manz. Bry. du Plioc. de Rhodes, Mem. Soc. Gdol. de 
France, 3 e ser. vol. i. pt. ii. p. 71, pi. iii. figs. 26, 27. 
The peristome of the zooecial cells is raised on the inner 
side, and also slightly on the outer. The outer cells are 
trifid instead of simply acuminate. The cancelli between 
the rows of cells are formed of ribs connecting the rays, and 
form an open network. 
In most specimens the cancelli appear open ; but in well- 
preserved ones a delicate calcareous cover is found covering 
the aperture ; and this is perforated with about 2-10 holes 
(%• 11, a). A similar covering is present in a large number 
of Cyclostomata, but seems to have been overlooked. On 
the internal walls of the cancelli are delicate hair-like teeth 
growing from the side. These spines have globular termina¬ 
tions. These occur not only near the surface, but also down 
the tube ; but sometimes near the surface there are as many 
as six or eight nearly in the same plane (fig. 11, h). Similar 
denticles are to be seen in the British-Museum specimen of 
D. Houldsworthii , Busk; and I have the same in I), novee- 
zelandice , Busk. 
The Defrancia prolifer a , Rss., is composed of coalescent 
subcolonies resembling Discoporella radiata. 
Loc. Pliocene: Rhodes (Manz.), Bruccoli (Sicily). Living: 
Adriatic, 20-55 fathoms (H.), Mediterranean ( B .), Devon 
( Hincks ), ? Calvados (7)’ Orb.); Naples, abundant on Laurencia 
papillosa and other seaweeds from shallow water; Ceylon 
(as D. Houldsioorthii). 
105. Discoporella verrucaria , Fab. 
Discoporella verrucaria, forma verrucaria, Smitt, Krit. Fort. of. Sk. H. - 
Biy. 1866, p. 405, pi. x. figs. 6, 8, pi. xi. figs. 1, 6. 
I have this adnate as a single disk, and a specimen from 
the same Pinna with two confluent colonies, and have also 
specimens, growing on Bryozoa and other organisms, irregular 
in shape with small attachment. The disks are about 6-10 
millims. The rays are very distinct and raised; near the 
