Adeonella (Lamiiiopova) coiitorta, cCr. 401 



cells round hollow spaces, ami tliis stains more than any 

 other part, and this so much resembles parts of testes as seen 

 in some species, that it was examined with this idea, but no 

 confirmation was found. This Arleonella coiHorta material 

 has been in spirit some time and there is contraction from 

 the walls of the zooecia, but this is not the case in sections 

 of Adeonella polystomella. 



The specimens have not shown the relationship of all the 

 parts, and we want In know more about the earlier stas:es, 

 thoH2;h in Betepora celhthfta, L., some quite small masses 

 have been seeji {rrowinor from the lateral wall (PI. X. 

 fi^. .')) and some small masses near the basal wall in Adeo- 

 neUa contorta, and further material may supply missing 

 links. 



In A. con'orta T have found some zooecia containing a 

 reticulum upon which there are a number of oval cells *, 

 looking like enlarged nuclei, which stain deeply (PI. XI. 

 fiff!^. 1,2). Tliese cells are sometimes much enlarged and 

 irregular in shape and are often seen to be forming groups, 

 which mav ultimately be found surrounded by a wall. Some 

 of the bodies are seen in this reticulum, which reminds us of 

 the reticulum in the ovicells of the Oyclostomata and is really 

 a great development of mesenchym cords. 



In some cases there are groups of five or six nearly round 

 cells with a small nucleus (PI. XI. figs. 7, 8), later on we 

 see them enclosed showing the early definite form of the 

 body. 



A polypide or bud is frequently found at the side of the 

 mass (PI. XI. fig. fi, h), and sometimes part of a polypide 

 is enclosed, though in many cases this is onlv apparently so, 

 the mass surrounding part of the polypide alone being 

 bounded by the mesenchym tissue. These groups of bodies 

 are contained in zooecia in various conditions, for they may 

 occur near to zooecia fgoncecia) with fully developed embryo 

 (PI. XT. fig. 5) or to zooecia almost filled with testes 

 (PI. XI. fig. 4), and occur in the same zooecia as the 

 ovaria or spermatozoa, but most frequently in zooecia with 

 buds in various stages ; small masses are found in zooecia 

 with polypides in full activity, but as a general rule where 

 the mass is large the polypide has mostly degenerated. 



The order of ,2:rowtii seems to be from the stage repre- 

 sented in PI. XI. fiffs. 7, 8, through stages shown in 

 several figures, to PI. XI. fig. 3, b 1, then to PI. XI. 



* A small liofht spot or vacuole is seen in these cells, but cannot always 

 be made out with a ,', immersion ; in some of the larger cells there are 

 several spots. No nucleus is visible. 



33* 



