255 



zooecial side of the mother-zooecium with a membranous, supra-scapular chamber 

 (m. I). 



The oceciutn. The gonozooecium, the aperture of which is provided with a 

 more strongly projecting but less strongly thickened under-lip than the ordinary 

 zoojcia, is a single zooecium, which may spring from a mother-zocecium as well 

 as from a daughter-zooecium. In a colony from Victoria three gonozooecia may 

 appear immediately succeeding each other. The scapular chamber is developed 

 as an avicularium with a small mandible, which is only visible from the side. 

 It is very long, narrow and may sometimes almost reach the top of the ooecium, 

 with the covering zooecium of which it has coalesced. When seen from the 

 frontal surface the two almost parallel avicularia have a quadrangularly colum- 

 nar appearance, and each has a supra-scapular chamber with a membranous 

 roof on the top and on the basal surface. The covering zooecium, which is other- 

 wise of the ordinary structure, has a large, quadrangularly or pentagonally 

 rounded fenestra distally to the aperture of the gonozooecium, and the ooecium 

 shows on either side a broader or narrower, arch-shaped belt, which is quite 

 white bj' reduced light and reddish by strong reflected light, originating from an 

 incomplete calcification. Around it a rather large area is seen showing the 

 boundaries for the coalescence of the ooecium with the lateral walls of the 

 covering zooecium. 



Form of colony. The alternation of uni- and bi-zooecial internodes is regular, 

 but rows of single zocecia may also appear. 



Colonies from Victoria (Miss Jelly). 



Catenaria elegans (Busk). 

 Catenicella elegans Busk, Voyage of Rattlesnake, I, pag. 361; 



Catalogue 9f Marine Polyzoa, Cheilostomata, pag. 10, PI. IX, 



Challenger, Zoology, Vol. X, Part I, pag. 12, PI. I, figs. 2, 3, 5. 



(PI. XXI, fig. 2 a, PI. XIII, figs. 3 a, 3 b). 



The zooBcia, the breadth of which may be contained 2V2 times in the length, 



are elongated, slender, with evenly arched sides without marginal ridges and 



with a frontal surface less arched than the basal surface. The proximal margin 



of the aperture is not very concave and forms almost right angles with the lateral 



margins. 



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

 zooecial side of the daughter-zooecium, developed as an avicularium, which is 

 directed almost straight outwards, but with a slight basal turning. The straight 

 or slightly arched roof forms an approximately right angle with the longitudinal 



