38 



yond that of the old one, and at the same lime the rich deposition of calcareous 

 matter speedily effaces the limits between the two apertures and prevents us from 

 deciding how many times a certain zooecium has been regenerated. In a specimen 

 from Tours (fig. 11) the apertures are directed obliquely downwards, and some of 

 the zooecia show a strongly developed dorsal surface provided with a number of 

 deep pits. 



Numerous specimens from Villedieu and Tours. 



Meliceritites dicholoiiia (?) d'Orbigny. 



Semielea dicliotoma d'Orbigny, Bryoz. Cret. p. 637, pi. 638, figs. 6— 8, pi. 738, ligs. 10 — 11. 



(PI. V, figs. 1, 2.) 



The Zooecia which are twice as long as broad are not divided by distinct 

 marginal ridges, and the distally ascending suboral area is in most cases longer 

 than the aperture which together with the well-developed pcristomial thickening 

 takes up the whole breadth of the zooecium in its distal part. No tubercles. The 

 aperture which is as broad as long or even broader than long is provided with a 

 well-developed oral ledge, and the two lateral margins either run together in a 

 broad distal curve or in a curve more or less angularly bent. The convex oper- 

 culum shows a distinct flabelliform striation. — 



The Heterozooecia which are spread among the zooecia, rarely singly, mostly 

 in groups of 2 — 8 have the same length as the zooecia, and the somewhat projec- 

 ting distal half is provided with a triangular aperture, about twice as long as broad. 

 All the heterozooecia examined were closed by a somewhat concave lamina. 



Ooecia have not been found. 



No Kenozooecia. 



The Closure takes place by means of a flat or concave lamina which in the 

 zooecia sometimes has started from the edge of the rim, sometimes at a deeper 

 level. — 



The Regeneration. I have seen many cases of regeneration both of new zooecia 

 in old ones, of new heterozooecia in old ones and of heterozooecia in old zooecia- 

 1 have examined a hollow compressed fragment from Tours lent me by Dr. Pergens. 



Meliceritites armata n. sp. 



Hornera SUeiistrupi Pergens (partim), Bryoz. de Faxe, p. 218, pi. XllI 2 a, 2 b. 



(PI. Ill, figs. U-16 ) 



The Zooecia (long 0,8 mm.) which are divided by well-developed marginal rid- 

 ges are about twice as long as broad, and the concave or saddle-shaped suboral 

 area is obliquely ascending towards the somewhat projecting distal end. No tuberc- 

 les. The aperture, the length of which in most zooecia is contained about Ihiee 

 times in the length of the whole zooecium is about as broad as high and ])r<)vide(i 



