AJeonellu (Laininopoia) coiitoita, dr. 40'.> 



tliis leinintU us of the tubule on the closure of many C!yclo- 

 stoniata it is very ditferent, as it occurs over the operculum, 

 and in sections where there has been a second layer o£ zocecia 

 this is seen like an inverted tunnel attached to the tissues ot 

 the zooeeiuni bL-low the operculum. 



As Michelin's description is in a periodical not readily 

 obtained it is now repeated: " Laminopora tixa, ramosa, 

 subcompressa, rainulis lamellosis, brevibus divaricatis, con- 

 turtis, raro coalitis ; extremitatibus unduhitis, porosissiniis ; 

 poris utraque suj)erficie, terminalibus^ subrotuudis, sscpe 

 obstruclis ; tuscante." 



EXPLANATION OF THE PLATES. 



Plate X. 



Fi(/. 1. Adeonella cotitorta, }>lich. X 150. Section of a zoceciuin nearly 

 tillecl with the described bodies in a plasma mass, surrounded 

 by mesenchyni tissue. The left-hand body {f.y.) near to the 

 opercular aperture stains much more than any others. The 

 various bodies vary considerably in structure, and this mass 

 may be taken as quite characteristic, a large number of 

 practically similar ones having been seen. 



Fii/. '2. Ditto. X 720. Part of the above more magnified, showing the 

 left-hand tube-like body partly tilled with a deepl}' staining 

 growth {t.ff.). 



Fit/s. 3, 4. Ditto. X 720. Transverse sections of bodies. 



Fit/. 5. Itetepora cellulosa, L. X 250. A small mass growing on the 

 lateral wall of the zocecium. 



Fi(/. 6. Adeonetki cunt.vrta, M. X 250. Section of a zoa?cium showing 

 a mass with several bodies and a part of a bud (6) by the 

 side, but not enclosed in the mass; pore-tubes {^ p.) full of 

 dark cells ; outer membrane {o.m.) of the zoarium ; oper- 

 culum [op.) ; walls of the zoojcium {w.z.). 'fhis specimen is 

 somewhat dilFicult to understand, as it has the appearance of 

 being reversed. 



Fig. 7. Ditto. X 720. Transverse section of body. 



Fiy. 8. Ditto. X 720. Longitudinal section of body. 



Fiy. 9. Ditto. X 250. Transverse section showing mass with several 

 bodies, and here the histolysing remains of the tentacles of a 

 polypide are enclosed in the mass. 



Fitj. 10. Ditto. X 25. Transverse section showing several masses in 

 zooecia, and other zocecia in which the tentacles, stomach, 

 &c. are seen in vigour. Zooecia a, c, d, f, m show sections 

 of the polypide ; 6, ff, J, k, I show masses of the bodies 

 described ; h, i show the opercular muscles ; e is empty. 



Plate XI. 



Fiy. 1. Adeonella contorta, Mich. X 320. Zooecium containing mass 

 with dark cells of varying sizes on a reticulum formed of 

 anastomosing plasma. Two of the bodies described are seen 



