836 MR. A; W. WATERS ON 
Diastopora with tubules has been called Diplopora, a name 
already used for a calcareous alga. MacGillivray made a genus 
Diplopora, but finding the name occupied changed it to Diplo- 
porella ; the name Diplopora has also been given for two or three 
other things. The group, however, occurs incrusting and bila- 
minate. The family Diastoporide will probably be found to be 
more distinctly separated than any of the others. 
Hornera. The ovicell is a large subglobular, dorsal or some- 
what lateral chamber with large pits and a lateral oceciostome. 
‘Tentacles, 9 in species examined. The ‘* Hornera eburnea” 
Jull. & Calv. has a most curious anterior ovicell, but I do not 
see why it is placed with Hornera; also the Hornera gravieri* 
Calv. seems to have a somewhat similar ovicell. Zoccial 
aperture of Hornera 0-04—0°12 mm. 
Discotubigera (Defrancia). Tangential ovicell with oceciostome 
near the distal border. One specimen has the ovicell the whole 
way round the periphery. No doubt many species have been 
placed under Lichenopora. 
Stomatopora. Although many Stomatopore have heen figured 
and described, but very few ovicells have been seen, and Smitt 
said no species were known with ovicells. In 4. divergens 
Waters t, the ovicell is a small round elevation on the anterior 
surface. In S.(?) sp. from Plymouth the ovicell is at the end 
of an erect branch as in Supercytis. In S. major Johns., the 
anterior ovicell has a small plain tube for the oceciostome. 
The S. compacta Norm. is Diastopora, and has the ovicells 
raised in between the openings of a small number of zoacia, or 
is tangential, with the occiostome as in Diastopora. Norman's 
specimens examined are now in the British Museum, 
Lichenopora. Ovicell central and spreading between the rays. 
Oceciostome erect, plain or funnel-shaped; or a plain horizontal 
tube low down near the edge of the ovicell. There may be many 
oceciostomes, probably indicating several ovicells, just as a colony 
of Diastopora may have a number of ovicells. Smitt mentions 
eight occiostomes in L. verrucaria, and this must have been a 
fine specimen, as I have never seen more than six. The zoecial 
apertures in all recent species measured are about the same size 
(from about 0-06—0-09 mm.). 
Defrancia lucernaria Sarvs and Domopora stellata have the 
ovicells in between the rays. 
Frondipora has the ovicell across the anterior surface of a 
branch, not much raised, and the occiostome, about 0:12 mm. 
wide with the lower edge straight, also is but little raised, and is 
not attached to a group of zocecia. 
Flosculipora has the ovicell-wall uniting from neighbouring 
zocecial bundles. 
* Calvet, “ Bry. Cyclost. prov. des Camp. scient. accomp. p. S. A.S. le Prince de 
Monaco a hord de Ja Princesse-Alice,” Bull. Inst. Ocean. No. 216, p. 7, fig. 6 (1911). 
+ Krit. Fort. 1866, p. 414. 
+ Expéd. Antarct. Belge, p. 89, pl. ix. fig. 6 (1904), 
