82 F. A. SMITT, 



Fig. 204; The same variety, with more depressed zooecia, whose front side is covered by a warty ectocyst. In 



the midst of the figure, the shadowed zooecion presents that extraordinary shape of the aperture, as 



described in the text. 

 » 205; The same variety, with a still greater development of that curious, extraordinary zooecion, as shown 



in the midst of the figure. 

 « 206; The other variety of this species, Eseharella setigera, in a high degree of calcifieation, with the 



avicularia transformed to vibraeularia. 



Plate XI: 



» 207; Gemellipora striatula; group of zooeeia with avicularia and ooecia. In the same degree of enlarge- 



ment as the fig. 209. 

 » 208; Gemellipora glabra, the top of a branch, at two thirds of the degree of enlargement of the preee- 



ding figure. Above two of the zooecial apertures, the uneovered front side of the ooecion is shown. 

 » 209; An older part of the same stem, with two avicularia and one ooecion. 

 » 210; The same stem, in its natural size. 



» 211; Eseharella Audouinii; group of zooecia, two of which are provided with ooecion. 

 » 212; Gemellipora limbata, creeping över a dead and worn, indeterminible Cellepore. 

 » 213; A single zooecion, provided with ooecion, as seen from its front side. 

 u 214; The outlines of that same zooecion and ooecion, as seen laterally. 

 » 215; Lepralia inornata; group of zooeeia. 

 » 216; Another part of the same colony, with avicularia. 

 » 217; Lepralia cleidostoma; group of younger zooecia, with ocecia and avicularia. The one zooecion, at the 



left in the figure, presents two marginal bristles at its aperture. 

 » 218; An older part of another colony, of the same warty appearance of the zooecial wall, with the limits 



between the zooeeia evanished. 

 » 219; Part of another colony, of a smooth surface of the zooecial wall. 



» 220; Lepralia edase, in the forma calcarea; group of zocecia with one boat-shaped avicularium. 

 » 221; The whole colony, in its natural size, as having overgrown and eaten away a Serpulan tube. 

 » 222; Group of zooecia, with avicularia (both lateral, of the ordinary size, in the limitar furrows, and boat- 

 shaped ones) and ooecia; from another colony. 

 » 223; That same colony, in its natural size. 

 » 224; The same species, in the forma janihina; group of young zocecia, of a more regular eonstitution, at 



the growing edge of the colony. 

 » 225; Another part of the same colony, with the zooecia of the formerly so named celleporine eonstitution. 

 » 226; Lepralia turrita; group of young zooecia, as seen a little laterally, with one spathulate avicularium. 

 » 227; A lateral view of two zooecia of the same colony, with their raised spines, and with small avicularia 



in their wall. 

 » 228; The outlines of three older zooecia of the same colony, with one spathulate avicularium, as seen 



vertically from the front surface of the colony. 



Plate XII: 



» 229; Eseharella bisinuata; part of three zooecial rows, with two ooecia and four boat-shaped avicularia. 



» 230; Eschara cervicornis; part of its creeping state (Lepralia, auett.). 



i> 231; Another part of the same colony, the one zooecion, in the middle of the figure, being provided with 



ooecion, another, in the top at the right side of the figure, presenting two marginal bristles at its 



aperture. 

 » 232; Discopora advena; group of zooecia, just prepared for being overgrown by a new zooecial layer. 

 » 233; Discopora albirostris, in its forma pusilla. As the most of the zooecial apertures, in their proximal 



part, are obscured by the prominent avicularium, the figures a and b give the primary zooecial aper- 

 ture as viewed free. 

 » 234; The typical Discopora albirostris, growing in the Hemescharan (auett.) manner, at the back side of 



the colony presenting spinous projeetions as well as, in the front surface of the colony, produeing 



mamilliform unevennesses. Nat. size. 

 » 235; Group of young zooeeia from the growing edge of this colony. 



» 236; Group of older, celleporine (auett.) zooecia from the inner part of the same colony. 

 » 237; Group of zooecia of that same celleporine eonstitution, of another colony, with the free, spathulate 



avicularia sometimes produced, as shown at the right side of the figure. 



