255 



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

 (m. I). 



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

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

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

 as from a daughter-zoa>ciuin. In a colony from Victoria three gonozoa'cia 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 oa'cium, 

 with the covering zod'cium of which it has coalesced. When seen from the 

 frontal surface the two almost i)arallel avicularia have a (juadrangularly colum- 

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

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

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

 rounded fenestra distally to the aperture of the gonozod'cium, and the on'cium 

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

 white by 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 oa»cium with the lateral walls of the 

 covering zod'cium. 



Form of colony. The alternation of uni- and bi-zoa-cial inlernodes is regular, 

 but rows of single zoa-cia may also appear. 



Colonies from Victoria (Miss Jelly). 



Catenaria elegans (Busk). 

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



Catalogue of Marine Polyzoa, (Iheilostomata, pag. 10, PI. IX, 



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



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



The zooecia, the breadth of which may be contained 2", 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 nuugin 



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



margins. 



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

 zoppcial side of the daughter-zoa'cium, developed as an avicularium, which is 

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

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



