CHILOPORA. 193 



Diagnosis. Zoarium irregularly branching; branches dichoto- 

 mize. The branches are all in approximately the same plane. 

 The central lamina is erect, and there are two or three series of 

 closely packed, subpolygonal apertures on either side. Below this 

 are from six to ten rows of dactylethrse. 



Distribution. Bathonian: Ranville, Lebisey, in Calvados, Prance. 



LIST OF SPECIMENS. 



D. 2116. Bathonian Calcaire a polypiers. Ranville. Tesson Coll. 



60228. 



60379. ,, ,, ,, ,, ,, 



B. 178. ,, ,, ,, ,, Presented by B. Bright, Esq. 



Order TREPOSTOMATA, Ulrich. 



Bryozoa in which the zoarium consists of prismatic or cylindrical 

 zocecia, which are arranged parallel to one another. The zoarium 

 is either massive or composed of encrusting or erect lamina). The 

 zooecia are either closely packed or separated by mesopores or by 

 interzocecial vesicles. The zooecia begin as thin, simple, immature, 

 cyclostomatoid tubes. Diaphragms are generally present. Generally 

 dimorphic. 



Family CERAMOPORID^l, Ulrich. 



Diagnosis. Zoaria encrusting, massive, or foliaceous. Zocecia 

 provided with lunarium. Walls formed of irregular, laminated 

 material. No interzocecial vesicular tissue. Diaphragms few and 

 horizontal. 



Remarks. This family has not hitherto been used to include 

 any forms found later than the Devonian. 



CHILOPORA, Haime, 1854. 



Diagnosis. Zoarium erect, of thick, flat, bilaminate fronds. 

 Mesopores numerous,, in rings completely separating the apertures 

 of the zocecia. Lunaria simple, lip-shaped, slightly reflexed. 

 Aperture somewhat transversely elliptical. 





