78 F. A. SMITT, 



EXPLANÅTION OF THE FIGIJEES. 



Plate I: 



Fig. 53; Nellia oculata, one internode with the adjoining parts of the articulated stem. 

 » 54; One zooecion of the same, raore higlily magnified. 

 » 55; Farcimia cereus; part of an internode, with the bases of its adjoining latera] interuodes. This stem 



was covered by its membranous ectocyst. 

 » 56; Part of an internode of the same species, as deprived of its membranous ectocyst; showing the se- 



condary, interna] calcilication. 

 » 57; Cellaria tenuirostris, an internode with the adjoining parts of the articulated stem. 

 » 58; One avicularinm and one zooecion of the same stem, nioie higlily magnified. 

 » 59; Part of the tip of a yonnger internode, at the development of the ooscia. 

 » 60; Vincularia abyssicola; part of a colony in its Membraniporidan state. 

 » 61; The same species, as raising itself, from the Membrauiporidan state, to tlie Vincularian growth. 



Plate II: 



» 62; Membranipora lineata. 



» 63; Membranipora irregularis. 



» 64; Membranipora siyillata; part of the reticulated slem, provided with ocecin. 



» 65; Part of the back side of the same stem. 



» 66; The same stem; nat. size. 



» 67; Part of the stem of a more elongated form of the same species, without ocecia. 



» 68; Part of the back side of the same stem. 



« 69; Membranipora canariénsis ; part of a colony, covered by its membranous ectocyst. 



» 70; Part of a colony of the same species, as deprived of its ectocyst. 



» 71; Part of the back side of the last-named colony. 



» 72; Mollia patellaria. 



Plate III: 



» 73; Mollia antiqua. 



» 74 ; Micropora coriacea. 



» 75; Cupularia umbellata; part of the margin of a colony, in a lower degree of calcification, as conserved 



in spiiit, covered by its ectocyst. 



» 76; Part of the back side of tlie same colony. At tlie sides of the figure, the warts are omitted. 



» 77; Part of a colony of the same species, in a liiglier degree of calcilication, as conserved in dried state. 



» 78; Part of the back side of the same colony. 



» 79; Part of a colony of the same species, as deprived of its ectocyst, showing tlie internal calcification of 



the zooecia. 



a 80; Part of the back of the ssme colony. 



» 81; Cupularia döma; part of the front side. 



» 82; Part of the back side of a colony of tlie same species. 



" 83; One small colony of the same species, nat. size. 



» 84; Diagram of another colony of the same species, aboitt two times the nat. size. 



