280 Ml?. A. AV. WATEKS OX 



EXPLANATION OF PLATE XIV. 



Fig. L 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 Filisjparsa irregularis, Meneghini. Dorsal surface. 



Naples. 



6. Short oyicell of Filisparsa irregularis, Mencgh. 



7. Section of zocecial tubes of Hornera fissurata, B., showing interior 



projections. 



8. Idmonea Milneana, d'Oi'b., from Capri. 



JS'ote. — I also found that in Gephyrophora polymorpha, B., 

 dredged by tlie ' Challenger ' from Simons Bay, there is an entirely 

 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 Liclienoporde. 

 By Arthur Wm. Abaters, F.L.S., F.Gr.S. 

 [Read 3rd May, 1888.] 

 (Plate XV.) 



By LicJienopora I understand a genus with cancelli between 

 the rays ; but there are other difcoid forms with the zoeecia 

 arranged in radial series, so that the mode of growth is common 

 to several genera. Yov instance, the fossil Acfinopora regular is, 

 d'Orb., does not seem to have any cancelli, and .1 cannot agree with 

 my friend Mr. Hincks in placing it uuder LicJie?iopora, but should 

 consider it Mult ituhig era. 



Dr. Jullien * would take us back 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 be Cupularia or allied genera. The genus 

 Lichenopora in , 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 otlicr hand, another 

 * Mission du Cap Horn : Bryozoaires. 



