280 
MI\ A. W. WATERS ON 
EXPLANATION OF PLATE XIY. 
Fig. 1. Anterior surface of Hornera fissurata, Busk, drawn from calcined 
specimen. 
2. Idmonea Meneghini, Heller. Naples. 
3. Dorsal surface (growing end) of Hornera fissurata, B. 
4. Dorsal surface of Hornera fissurata, B., showing ovicell. 
5. Normal ovicell of Filisparsa irregularis, Meneghini. Dorsal surface, 
Naples. 
6. Short ovicell of Filisparsa irregularis, Menegb. 
7. Section of zooecial tubes of Hornera fissurata, B., showing interior 
projections. 
8. Idmonea Milneana, d’Orb., from Capri. 
Note. — I also found that in Grephyrophora polymorpha , B., 
dredged by the ‘ Challenger ’ from Simons Bay, there is an eutirely 
concealed ovicell. It is a round sac quite free except at the border 
of the opening ; whereas in other Chilostomata, so far as my 
experience goes, the wall of the ovicell is for a considerable 
part attached to the zooecial walls. 
On the Ovicells of some Lichenoporce. 
By Arthur ¥m. Waters, F.L.S., F.G.S. 
[Bead 3rd May, 1888.] 
(Plate XV.) 
By Liclienopora I understand a genus with eancelli between 
the rays ; hut there are other discoid forms with the zooecia 
arranged in radial series, so that the mode of growth is common 
to several genera. For instance, the fossil Actinopora regularis, 
d’Orb., does not seem to have any eancelli, and I cannot agree with 
my friend Mr. Hineks in placing it under Liclienopora, but should 
consider it Mult itubig era. 
Dr. Jullien * would take us hack to the name Disporella of 
Gray, and points out the curious mistake that was made for so 
many years in calling this genus Discoporella , Gray ; whereas 
Discoporella was a name given by d’Orbigny to some Chilostomata 
which would now he Cupularia or allied genera. The genus 
Liclienopora is, however, older than Gray’s, and is now well 
established, so that I am unable to understand why Dr. Jullien 
wishes us to return to Disporella. On the other hand, another 
* Mission du Cap Horn : Bryozoaires. 
