MeJiterranenn Teivia and Iilmonea. 15 



spculvs of as a basal lamina ; it also occurs in many other 

 Cyclostoniata, but in all that I have examined it cousists of 

 small parallel tubes, whereas llarnjcr mentions porous areas. 

 Is it |)03sible that these arc formed by local irregularities 

 of the tubes, or is it to be compared with the closed areas 

 which IJusk fij^ures on the dorsal surface of Idmonea 

 fe nest rat a, W." ? 



The ovici'll is wide, spreading to each side of the zoarium ; 

 also in /. serpens we may iiave an ovicell spreading across 

 the zoarium. As showing such ovicells 1 give a figure of 

 an Idmonea, probably an abnormal /. nutumale with three 

 broad oviecUs, but the fragment is diflicult to determine. 

 The shape of the ovicell docs not seem to require us to place 

 it in a new genus. 



There is also a piece of /. philippSiV from Cai)ri without 

 ovicells. 



EXPLANATION OF Till: PLATES. 

 Platk L 



Fiij. 1. 'I'lrcia »rt7»//<^//'.'*, Meiieghiiii, x 1-. Dorsal surface, sIiDwin}^ 



two ovicells. From Capri. 

 Fit/. 2. Ditto, X 12. Dorsal surface near a bifurcation. From Capri. 

 Fiff, 3. Ditto, X 12. Anterior surface. From Capri. 

 Fiy. 4. Ditto, x 12. D.irsal surface of K-r. 3. 

 /'/y. 5. Ditto, X 12. Dorsal surface, showiug lateral ovicell. Frnm 



Capri. 

 Fi;/. G. Ditto, X 12. Anterior surface of fig. 5. 

 Fiy. 7. Ditto, x 12. Anterior surface of fi^'. 2. 

 Fit/. 8. Ditto, X 12. Dorsal surface. From Capri. 

 Fit/. U. Ditto, X about 2. iShowiug the position of nine ovicells. 



From Naples. 

 Fi(/. 10. Idmonea menei/hinii? Dorsal surface, showing,' an niiditioual 



layer in wLich are lar>,'e pores, nematopores. Detween Fayal 



and Pico (Azores). 

 Fitj.W. Itlmo/iranofuinalfjlitisli. Anterior surface witli ovicell. From 



Capri. 

 Fii/. 12. Iiiiiiiniea(i(/(i}i/ic(i,Johu>^t.,x 12. With ovicells. From Capri. 

 Fit/. I.'?. Ditto, X 12. Lateral view witli ovicell. From Capri. 

 Fit/. 14. Idtnoiiea notomale, B. Dorsal surface. From Capri. 



Plate II. 



Fit/. 1. Iilvionea trifnris, Hell., X 12. FVom Naples. 



Fitj. 2. Lhnonea tiic7ifi//iinii, Ilell., X 12. Showing four ovicells on 

 the c'ol<ii)\', {ft) is at a bifurcation, {/>) is lateral, (c) is in the 

 middle of a branch, (//) is on one side of the median line : 

 {ti) hjui the oa'cio.>>tome distal to a scries, but it sUirts from tlie 



* Crag Polyzoa. ]il. xv. fig. 106. 



