Mediterranean Tervia ami Idinoncn. 3 



siil)-clli[)tical iiillatioiis (tf tlic znariuiii ol" consideruljlc size. 

 Tlicre are in D. sarnicnais tubulai' elosures to the zooccia. 

 It will be seen that Micro(ecia, as l)ase(l on sarnii'nsis. Norm., 

 breaks down; however, Iliiieks figures D. suborbiculniis,\\., 

 witli oviccU of the niicroaccia type, and says "somewhat 

 oval.'' 



Before (lanii made his classification of the Cyelostomatous 

 Hryozoa, I was iiitcndinjij to indicate three types of oviccll 

 in Diastopora. The first is small, and does not seem to have 

 any zooccial tul)e passing through it, so that it occurs between 

 three or four zooecia ; this form, which I was going to call 

 the simplex form, has been figured by llincks in his D. sub- 

 urbiculuris. The next, including D.ohelia, John., D.intricaria, 

 Sm., 1>. concinna, ^lacG., D. crisfuta, MacG., spreads over 

 many zocEcia, which, as well as the zooeciules, pass through 

 the ovicells, and these were considered the conglomerate 

 form; while the third has wide ovicells, called tangential 

 ovicells, as in V. patina, D. latomarginata, d'Orb., ]). obelia, 

 Johnst., J}. coDipacta, Norman. 



In 1914' * I put together what I had gatliered from my 

 own collection, etc., concerning Cyelostomatous ovicells, as 

 showing the direction in which work was wanted. Shortly 

 afterwards, possibly somewhat influenced by what I said, 

 Canu t, who had long been working in the same direction, 

 gave much more extensive information, evidently from more 

 material than I had available. Now, what I would say is, 

 fuller examination is required to see which characters are 

 variable, and as far as possible we should t xamine cases where 

 several ovicells occur on the same zoarium. 



It has been customary to say, ovicell at a bifurcation, and 

 so on, but, although the oviccll is frequently at a bifurcation, 

 we may find it in a species sometimes at a bifurcation, 

 sometimes (dscwherc, as we see in Tervia irrct/n/aris, I. 

 tticncf/hinii, and in various species oildmonea — thus the position 

 on the zoarial branch is a character of but limited value, 

 A considerable quantity of Tervia irreyuloris has been 

 examined, but the number of ovicells seen is relatively small, 

 and this paucity occurs very generally in the Cyelostomata. 

 From the Norlli Italian Bartonian I have had through my 

 hands a very large number of fossil Ii/monea', but do not 

 recall any ovicell having been found. The Meditcir.iiu an 



* " Bry. from Zanzibar," Troc. Zool. Snc 11)14, ii. 8.34. 

 t " Les ovicelles des Hrv. Cvclost.," Bull. Sue. tieol. do Fraiire, s<r. I. 

 V..]. xvi. (19l('.). 



I* 



