PLATE 21. 



Anthophysa rosea. 



See also Plate 23, figs. 1-5. 



Fig. 1, Transverse section of the pneumato]ihore near its apex. Five of the septa (Sm) on the 

 dorsal side connect pneumatosaocus (Pn. S) with pneumatocodon (Pn. C). The thick layer hning the 

 gas cavity (Ec^) is the secondary ectoderm. The septa contain giant amoeboid cells (Ce. G). From 

 a photograph. X 25. 



Fig. 2. Transverse section of the pneumatophore about its mid-level. At this level aU of the 

 septa end freely in the pericystic space. The grouping of the muscular lamellae is well shown. From a 

 photograph. X 25. 



Fig. 3. Radial section of the apex of the pneumatophore. Pg, pigment; En, ectoderm; Ec-, 

 secondary ectoderm; S. L, stutzlamella. From a photograph. X 75. 



Fig. 4. Portion of the same more highly magnified, to show the various cell layers. Lettering as 

 in figs. 1 and 3. X 200. 



Fig. 5. Transverse section of a .small portion of a septum, with its enclosed giant cells (Ce. G). 

 En, endoderm; Ec, ectoderm. X 125. 



Angelopsis dilata. 



Fig. 6. General view of colony, which has lost most of its nectophores and siphons. From a 

 photograph. Au, aurophore. X 6. 



Fig 7. Radial section of the colony, through the aurophore (Au), drawn from the dissection. 

 TheoutUneof the jraeumatophore is somewhat restored. There is a single young ncctophore (N), intact, 

 and also the muscular lamella (L. Mu) of an older one. X 9. 



Fig. 8. A cormidium. The siphon is situated on a gelatinous prominence, and is as.sociated with 

 a pair of gonodendra borne on an independent stalk. T, tentacle; P. palpon; Go, gouophore. X 25. 



