51 



ascends towards the strongly projecting distal part which rises in the form of a 

 short tube. No tubercles. The aperture which lacks a distinct oral ledge and pre- 

 sents no peristoniial thickening') ranges between semicircular and triangularly 

 rounded, and sometimes the distal end may be more or less distinctly pointed. 

 The convex operculum presents a distinct flabelliform striation. 



The Heterozooecia which may be twice as long as the zooecia are provided 

 with a concave suboral area and a very elongate aperture, the breadth of which is 

 contained about three times in the length. It attains its largest breadth at the di- 

 stal margin, and the two lateral margins which are incurved in their middle part 

 distally run together in a curve. There are no lateral thickenings. They are as 

 a rule present in scarce numbers, but not rarely there may be found 2—4 placed 

 near each other in the same transverse series, and in a single case I have found 

 7 forming an irregular, interrupted transverse row. 



Ooecia have been found. 



No Kenozooecia. 



The Closure is effected by means of a concave lamina. 



A Regeneration has not been found in the fragments examined. 



The Colonies are incomposite, and the examined cylindrical fragments have 

 10 — 12 zooecia in each transverse series. One of them which is fixed to a frag- 

 ment of a shell is provided with a basal expansion consisting of zooecia and hetero- 

 zooecia of the same kind as those found in the free cylindrical part. The hetero- 

 zooecia of this specimen (from Luton) are a little different from those found in the 

 others as the lateral margins of the aperture are not incurved in the middle but 

 converging distally. 



Chatham, Gillingham, Luton (middle chalk) Fecamp (middle Senonian). 



Meliceritites Dollfiisi. var. tubuliforniis n. 



(PI. V, figs. 9. 10.) 



Of this form which 1 provisionally refer to M. Dollfiissi I have only seen a 

 single fragment 4™"' long and 1""" broad. The most conspicuous difference is the 

 length of the tubular distal part, which is about as long as the suboral area. 

 Sometimes the frontal part of it is divided from the rest by two more or less di- 

 stinct marginal ridges. The obliquely ascending aperture is half-elliptical or trian- 

 gularly rounded, and the very convex operculum is distinctly striated. The Hetero- 

 zooecia of which there is found three do not differ from those in M. Dollfusi and 

 that seen in fig. 10 which seems to be shorter is not quite correctly figured as the 

 distal part was broken olT. — Evreaux (middle Senonian). 



') When Gregory in this species speaks about "well raised" peristomes, he confounds a raised 

 peristome with a freely projecting distal part of a zooecium. 



