k. 



29 



Heterozooecia and Ooecia have not been found. 

 The Kenozooecia. Only a single time two small kenozooecia have been found 

 in an angle between two branches. 



The Closure which has been found in many zooecia is effected by means of 

 a flat or concave calcareous plate which as a rule starts from the free edge 

 of the oral ledge and therefore fuses together ci. 



with the latter. Sometimes, however, it starts at f^w^gi^js; "^^^ 

 a deeper level, and in that case the marginal ^&^ } | 



depression is distinctly divided from the closure- 

 plate. 



The Colonies are freely branched with cy- 

 lindrical branches, in which the zooecia are ar- v^fe:*^ 



ranged in more or less regular, alternating trans- , , ^" ' . . 



° . o ' o (.] closure-plate. 



verse series each of which in the primary or 



incomposite colony contains 14 — 16 zooecia. Gradually the colonies 

 fig. a. o^i multi-layered, and in one of the original specimens of Goldfuss 



1. oral ledge. there is found four different layers the outmost of which presents 



o. operculum. ^ „umber of different centra, 

 k. kenozooecium. . . . . j. j j ^ • i 



1 his species is as a rule badly preserved, and most zooecia have 



either lost the larger part of their frontal wall or this has been in different degree 

 covered by incrustations. These circumstances together with the frequent closure 

 of the zooecia are the causes whj' only very few apertures present the characteri- 

 stical oral ledge the length of which attains more than the third part of the length 

 of the whole aperture. 



Of this species I have been able to investigate not only the original specimens 

 of Goldfuss kept in the palæontological museum of Bonn (Prof. G. Steinmann), 

 but also a number of exemplars from the palæontologicai museum of Münster 

 (Prof. H. Wegner), which have been found in a conglomerate of gypsum at Essen. 

 Under the name of Ceriopora gracilis Goldf. the latter were mixed with a number 

 of species belonging to different families and genera, and among these I found be- 

 sides another species of Meliceritites a species of Entalophora to which I must refer 

 the figure which accompanies Roemer's description of Mel. gracilis. While the aper- 

 ture of the latter species is longer than broad, and the zooecia are as a rule about 

 twice as long as broad the aperture in Roemer's figure is broader than long and 

 the zooecia only half a time longer than broad. The description, however, corre- 

 sponds better to the original specimens than to the figure. I provisionally propose 

 the name Entalophora Roemeri for this species of which I here give the following 

 description. The hexagonal zooecia which are only half as long as broad are 

 provided with a very concave frontal area and divided by strongly developed 

 marginal ridges. The aperture which takes up the larger part of the breadth in 

 the distal part of the zooecium, and together with the peristome about half the 

 length of the whole zooecium is triangularly rounded, broader than high and pro- 



