'ig 



130 





131 



» 



132 



» 



133 



» 



134 



» 



135 



U 



136 



» 



137 



M 



138 



» 



139 



80 ' \. SMITT, 



Esoharipora stellata. 



The same speeies. The shadowed zooecion shows the primary aperture almost unaltered. 



Sorae zooecia of another eolony, showing different forms of the aperture. 



One separate zooecion, from the same eolony as the figure 130. 



Porina plagiopora, younger zooecia, in a lower degree of calcification. 



The same speeies. From the margin of another eolony, in a higher degree of calcification. 



Porina subsulcata, from the growing tip of a stem. 



Part of the margin of the same stem, with its great avicularia. 



Some older zooecia, from another stem. 



From the same stem as the preceding figure, lower down. One of the zooecia is closed. Över the 



proximal part of the zooecia, new avicularia are developed. 

 140; From a yet older part of the same stem. 

 » 141; Anarthropora minuscula, a young eolony, in the beginning of its growth. 



» 142; Hippothoa (?) fenestrata, the young zooecion, highest in the figure, showing its primary aperture. 

 » 143; Tessaradoma boreale, a eolony of the Lepralian (auett.) state, in the beginning of its growth. 

 » 144; One eolony of the Alysidotan (auett.) state, doubling its zocecial row (Lepralian state) and, thence, 



raised into the growth of Tessaradoma. 

 » 145; Part of a more highgrown stem. 



Plate VII: 



>> 146; Mamillopora cupula, part of a eolony with ooseia. 



" 147, a — c; Three different colonies of the same speeies, in their natural size and shape 



» 148; Myriozown ovum, an eutire internodium, disjointed, of the probably articulated stem. 



a 149; The lower half of another internodium, showing the longitudinal, central caual, as well as the shape 



and directiou of the zooecia. 

 » 150; The cancellated, quadrangular frontside of one zooecion, with the adjoining aperture of the nearest 



older zooecion of the same row, as well as the apertures of the avicularia in the outer limits between 



the zooecia. 

 » 151 ; The outlines of some zooecia of the same speeies. 

 » 152; Gemellipora eburnea, part of the creeping stem. In the midst of the figure, the base of the oldest 



zooecion of the raised stem is seen projeeting from the front side of the creeping zooecion. 

 « 153; Part of a raised stem. 



» 154; Part of a branch as projeeting from the prostrated median stem. More highly magnified. 

 » 155; Part of the same branch, as seen from the front-side of the zooecia; still more highly magnified. 

 » 156; The outline of a zocecial aperture of this speeies. 

 » 157; Gemellipora lata. 



» 158; Hippothoa porösa, the Floridan variety of the Hippothoa Hyndmanni. 

 » 159; Hippothoa pes anseris, the Floridan representative of the Hippothoa Dutertrei. 

 » 160; The outline of a zocecial aperture of this form. 



Plate YIH: 



i» 161; Hippothoa, spongites ; part of a eolony in a low degree of calcification, with greatly developed avicu- 

 laria, with an ocecion, crowned by three avicularia, covering the aperture of one zooecion as well 

 as the greatest part of the front-side of the nearest younger zooecion of the same row. 



" 162; Part of a variety of this speeies in a higher degree of calcification with smaller avicularia, with the 

 outline of one ocecion in the top of the figure and with a great, spathulate avicularium in the 

 middle of the figure. 



ii 163; Another part of the same eolony. 



« 164; Escharella sanguinea. At the left, in the top of the figure, one of the great zooecia is shown, as 

 described in the text. The figure, moreover, shows the ordinary zooecia and the ocecia as well as 

 the avicularia, the latter varying both to their place and size. 



» 165; The outline of one of the ordinary zocecial apertures, more highly magnified. 



» 166; Hippothoa Isabelleana; group of zooecia of the youngest layer of the eolony. 



ii 167; This eolony in its natural size. a : its intersection in the lower end. 



u 168; Part of a variety of this speeies, in a higher degree of calcification, growing in a single zooecial 

 layer, doubtfnlly to separate from the Hippothoa secundaria of the northern regions. 



ii 169; Hippotlwa mucronata; group of zocecia together with two ooseia. 



« 17'»; (Jellepora verrucidata; group of zooecia with ocecia, avicularia and secondary warts, from the older 

 part of the eolony. 



