38 SYSTEMATIC SYNOPSIS. 



SUBCLASS I. ENTOPBOCTA, Mtsche. 



Both mouth and anus within the lophophore, which is prae-oral 

 in origin. [No fossil representatives known.] 



SUBCLASS II. ECTOPROCTA, Mtsche. 



The lophophore postoral in origin ; it does not enclose the anus. 



Section 1. PHYLACTOL^EMA, Allman. 



Lophophore horseshoe -shaped. A movable epistome overhangs 

 the mouth. [No fossil representatives known.] 



Section 2. GYMNOL^EMA, Allman. 

 Lophophore orbicular. No epistome. 



Order 1. CTENOSTOMATA, Busk. 



Zocecia never calcareous. Orifices guarded by setae-like processes. 

 [No certain fossil representatives of this order are known, the unity 

 of which is very doubtful.] 



Order 2. CYCLOSTOMATA, Busk. 



Bryozoa in which the zocecia are simple, elongated, and cylin- 

 drical, and typically grow in tufts or sheets formed of radiating 

 zooecia. Mesopores are rarely (if ever) present. Mouths circular, 

 and generally raised above the surface of the zoarium. Ocecia of 

 enlarged zooecia. Appendages absent. 



Lr *' } Dec. 1830. Fide Ferussac, Butt. Sci. Nat. t. xxiv. 1831, pp. 79-82. 



,, 6. ... 1834. Fide Mag. Nat. Hist. vol. vii. 1834, p. 656. 

 Ehrenberg's name Bryozoa was apparently not published until 1831, although 

 the date on the cover of the part of Symbolae Physic in which it appeared is 

 1828 ; the plates were issued in that year, but the text was not issued till 1831, 

 if we may trust the authority of Isis, 1832, p. 1274, for reference to which I am 

 indebted to Mr. C. D. Sherborn's MS. Index Generum et Specierum. 



