242 



The ooecium. In the two cases hitherto round the gonozooecium is a inother- 

 zott'ciuin situated on a single zooeciiini. It is covered l)y a zoa?cium of ordinary 

 structure, which only shows any difference in having a nund)er of scalteretl pores 

 in its frontal wall which does not seem to he specially strongly arched. Nor 

 does this covering-zoa'ciuni coniplele the branch, hut may he succeeded hy at 

 least one single zoojciuin. Tlie aperture of the gonozoa'ciuni has a ])r()xiniai 

 concave margin with acute corners. 



Form of colony. The alternation of uni- and hi-zod'cial internodes is regular. 



Ol this species I have examined some small colonies from Port Phillip Heads. 



Claviporella M. Gillivray, char, emend. 



The aperture is provided with a more or less deep sinus and with two robust, 

 strongly projecting hinge-teeth. Behind the aperture there is an inner cryptocyst 

 lamina and most often an oval, median pore, a remnant from the primary frontal 

 sinus. On either side of the aperture is a cylindrical acropetal spine, and the 

 pedal chamber, situated far ])roximalIy, is rudimentary and only commimicales 

 with Ibe zoa'ciuni through a single rosette-plate. The occlusion takes place in a 

 way similar to that in Scuticella. 



Claviporella geminata W. Thomps. 

 Catenicella geminata ^^^ Thompson, Nat. Hist. Review, V, 18r)8. 



Proceed. Dublin Univ. Zool. and Botan. Associat. I, i)ag. S J, 

 PI. VII, figs. 3, 4. 



(I'l. XII. li^s. 3a, .■?])). 



The zooecia, which excluding the lateral chambers are rounded trapezi- 

 form, have a number of very small scattered pores, and the sternal area gener- 

 ally shows 2- '), most often very small fenestra\ The aperture, the sinus of 

 which is twice as long as broad, is surrounded by '2 — 4 acropetalous spines of 

 very varying size, 2 distal, frontally directed ones and two lateral, the two former 

 of which diverge very little and may attain the length of the aperture on the 

 single zofpcia. On the mother-zoctcium they are but small, and this is always 

 true of the lateral ones, wliicii are most often rudimentary or absent on the 

 single zod'cia. On the proximal side of the sinus a moic or less distinct sulural 

 line leads down to a small, very narrow pore, the margins of which are gener- 

 ally provided with small, dentiform |)rocesses. The two short, broad spines, 

 which meet in the sutural line, do not show any vestige of an inner cavity. 



The lateral chambers. The scapular chandler is everywhere, also on the ad- 

 zoa-cia! side of the daughter-zo(rcium, developed as a somewhat compressed avi- 



