FLORIDAN BRYOZOA. 61 



on a deacl Rhynchonella, for the most part is overgrown by a crnstacean Nullipore, 

 only a few zooecia remaining free, and these all wanting the oral avicularium. The 

 other colony (fig. 202) is young and clear. of a prettily shining, påle azure bluish 

 hue. Here, the small, roundish oral avicularia are constantly developed above the median 

 denticle of the zocecial aperture, enclosed into its secondary margin; and with their 

 dorsal (here distal) side, usually, they are projecting into the secondary zocecial mouth, 

 like an upper, secondary denticle. As to their size, both these colonies have the 

 breadth of their zocecial aperture of about 0,19 mm. 



ESCHARID.E. 



In my former papers l ) I proposed the establishing of this family, as founded, 

 principally, on the horseshoe-shape of the zooecial aperture; and still I think, in this 

 manner a very natural group will be collected around the old-known Lepralia palla- 

 siana and Eschara cervicornis. But in two ways, the preceding family has more and 

 more approached to the typical constitution of this group., viz. throngh the Escharella 

 depressa to the Lepralian and through the Escharella Landsborovii to the Escharan 

 type. Furthermore, in the following, I will give reason for uniting into'one family 

 these types with the Discopores, then, of course, changing the characteristic of this fa- 

 mily, as formerly given. 



Around the Lepralia (Cellepor a) edax, as formerly known from the Tertiary Crag 

 and the Recent British sea, a series of forms, very intimately connected with each 

 other, will be grouped together. 



Lepralia inornata 2 ) (Pl. XI, figs. 215 and 216). 



This species, evidently, bears the strongest resemblance to the above-described 

 Gemellipora striatula and possesses the same colonial organs, in the same position, as 

 in that species, with which it agrees, also, in the size, the breadth of the zooecial aper- 

 ture, according to the different age and development of the colony, varying between 

 0,05 and 0,07 mm. The avicularia, with their small, round aperture, here also, have 

 the appearance and position of abortive zooecia, placed, normally, at the distal end of 

 these, but in the development of a new zocecial row taking the first place at its origin, 

 in the position as shown by the fig. 216. The ooecia, also, with the avicularium close 

 at their distal end, agree with those of the Gemellipora striatula. Lastly, the trans- 

 verse striation (undidations, Gabb et Horn) is common for both these species. The 

 manner of calcification, however, is not the same, for, besides the missing, in the 

 Lepralia inornata, of the longitudinal striation, its zooecial wall grows thicker, and, in 



weve it not for the pointed mandible of the avicularium, as shown in the figures given by Busk, these 



two forms ought to be uuited into one species. 

 !) Öfvers. Vet. Akad. Förh, 1867, p. 481, and. Bih„ p. 122. 

 -) Cellepora inornata, Gabb et Horn, Foss. Polyz, Sec. and Tert. Form. North. Amer., Journ. Acad. Nat. Se 



Philad., n. ser., vol. V p. 127, tab. 19 fig. 10. 



