FLORIDAN BRYOZOA. 51 



Hab.: In profundo 42 orgyaruin coloniam hujus speciei cepit Pourtales. 



For the outer appearance of this species, as seen by a lower degree of magni- 

 fying, in its older parts, we can refer to the fig. 9 of the plate 78 of the Iconographie 

 Zoophytologique by Michelin, representing his Eschara labiosa, with the only remark, 

 that the tuberosities would be smaller and more separated from each other. In their 

 younger state, of which I give the figures, the zooecia, of an escharine constitution, 

 are more obviously decumbent, presenting the Myriozoidan form of the primary aper- 

 ture, whose breadth is about 0,13 mm. As the calcification proceeds, the oral avicula- 

 rium is involved therein, with its aperture pointing obliquely upwards. The furrows 

 between the zooecia in the same time are filled up, with their pores remaining in the 

 rather irregular cancellation on the otherwise plain surface of the colony. Mean-while, 

 also, the lateral avicularia are formed on the proximal part of the front-side of the 

 zooecia, almost in the same position as the supernumerary ones in the Hippothoa bia- 

 perta. Where the ooecia are developed, they are very soon involved in the layer of 

 calcification, marked only as low, transverse swellings distally of the secondary zooecial 

 apertures. Here and there on the thus formed secondary surface of the colony, small 

 tuberosities are to be observed; but most constantly they are formed on the margin of 

 the secondary zooecial aperture, generally four, one at each side of its more or less 

 quadrangular circumference, but very often their number increases to six. Of these, 

 the one belongs to the tip of the oral avicularium, the other are merely unevennesses 

 of the layer of calcification. Through their pure white colour, they show off against 

 the shining vitreous (bluish white) surface of the colony. The breadth of the secon- 

 dary zooecial aperture is about 0,16 mm. 



As it will be seen, this species, through the form of the primary zooecial aper- 

 ture, as well as through the manner of calcification, comes very near to the HijJj/othoa 

 biaperta. I have only seen one specimen of it, taken by Pourtales W. of Tortugas, 

 but this a very complete one, giving a good idea of its developmental changes. 



Cellepora coronata (Pl. IX, fig. 186). 



Char.: Zooecia erecta crustam colonias superficie fere planam exstruunt poris pun- 

 guntur, margine secundario aperturse tuberculis vulgo sex coronantur, aviculario laterali 

 rotundo in fronte colonia? muniuntur. Ooecion unum solum vidi, poris punctatum, ma- 

 ximam ad partem stratu calcificationis obductum. Apertura secundaria zooecii latitu- 

 dine 0,24 mm., altitudo zooeciorum 1 mm. fere sequat. 



Hab.: Coloniam hujus speciei in prof. 26 orgyarum Oculinam investientem cepit 

 Pourtales. 



With the Myriozoidan character of thé zooecial aperture, although not easily 

 perceptible, this species combines the manner of producing, on the margin of the aper- 

 ture, secondary tubercles, as was to be seen in the preceding species, with which it 

 shares, also, at a lower degree of magnifying, the outer appearance of the plain sur- 

 face öf the colony. Its rounded lateral avicularium, although, relatively, much smaller, 

 and its piinctation by pores, although these more uniformly distributed, also are pa- 

 ralleled in that species. But, as far as I can see on the only specimen I have had 



