45 



The Closure takes place by means of a concave or flat lamina placed some 

 way within the aperture. 



The Regeneration. I have found a few zooecia regenerated. 



I have examined two small well conserved fragments from le Mans (Ceno- 

 manian), lent me by Dr. Pergens, and in these a number of the closure-plates 

 and of the opercula have undergone a similar more or less complete decalci- 

 fication as that found in Mel. Lorieri. 



Meliceritites lainellosa d'Orbigny. 



Elea lamellosa d'Orbigny, Bryoz. Cret. p. ()3'2, pi. (525, figs. 11 — 15. 

 - Pergens, Revision p 398. 



non Cea lamellosa d'Orbignj', Hryoz. Cret. p. 1007. pi. 787, figs. 11 — 13. 

 Elea lamellosa Gregory, Crctac. Bryoz. p. 299. 

 (PI. Ill, figs. 1-9) 



The Zooecia which are as a rule rhombic or hexagonally rhombic and moslly 

 twice as long as broad may be concave, flat or even a little convex and are di- 

 vided from each other by more or less distinct ridges, the development of which 

 may vary greatly even in the same colony. A more or less prominent tubercle 

 may be developed not only at the distal end of the zooecium but also at the 

 proximal corners of the aperture, and when the latter are placed in contiguous 

 transverse series the tubercles of two adjacent apertures when sufficiently near to 

 each other often fuse together into a single one. The development of the tubercles, 

 however, is subject to great variation even in the same colony. The aperture the 

 length of which is in most cases contained at least twice in the length of the whole 

 zooecium takes up the whole breadth of the zooecium in its distal part and lacks 

 an oral ledge, but is provided with a strongly developed peristomial thickening. It 

 is half-elliptical or triangularly rounded and always longer than broad, but the 

 relation between the length and the breadth is subject to rather great variation, 

 and sometimes it is almost half a time as long as broad. The operculum shows 

 a distinct flabelliform strialion, and the greater part of its surface is more or less 

 distinctly flattened. 



The Heterozooecia, which are scattered over the colony in rather large numbers, 

 partly singly, partly in groups up to four are in most cases longer and narrower 

 than the zooecia, and their distal end is more or less obliquely ascending. It is 

 provided with an elongate, roundedly triangular, dislally protruding aperture, the 

 lateral parts of which are covered by two very narrow, elongate triangular lateral 

 processes between which is seen an opening in the shape of an inverted T. 



Ooecia have been found. 



Kenozooecia have not been found. 



The Closure. I have not found a distinct case of closure in any zooecium, but 

 in old heterozooecia. 



