ilELICERITITES. 
329 
Diagnosis. 
Zoariim rising from a flat, discoid base. The branches are long 
and thin ; they dichotomize repeatedly, and the sub-branches 
may anastomose. The branches end bluntly. There are from 
ten to twelve zooecia in one circuit of the branch. 
Zooecia are hexagonal at their distal ends ; the front wall below 
the aperture is depressed and punctate, and may be pierced 
by a suboral pore. 
Apertures small and circular, or slightly flattened on the lower 
margin. The peristomial ring is complete and slightly raised. 
The apertures are arranged in a spiral, which in places 
becomes irregular. The successive whorls of the spiral are 
fairly wide apart. 
Avicularian zooecia slightly larger than the normal zooecia ; the 
aperture is at the lower margin of a deep concavity. The 
avicularia are few and widely scattered. 
Closed zooecia numerous. 
Dimensions. 
Diameter of branch . . . 
Diameter of zooecia ... 
Diameter of aperture ... 
B.M., D. 4523. 
l-l’o mm. 
... -2-’3 
... '1--15 
5) 
B.M., D. 7093. 
2 mm. 
•3 „ 
•16--2 ,, 
Distribution. 
England : 
Upper Greensand : Warminster. 
Foreign : 
Cenomanian : Le Mans and St. Calais, Sarthe ; Essen. 
Pigures. 
PI. XIY. Fig. Ic/, a zoarium, nat. size. Fig. \h, the distal 
end of a branch of the same, X 10 dia. Fig. Ic^ the zooecia on 
the lower part of a branch of the same, with one zooecinm closed 
by a sieve-like plate, X 10 dia. Fig. \d, part of the base of the 
same zoarium, X 1 0 dia. Cenomanian : Le Mans, Sarthe. Tesson 
Coll. D. 4521. 
PI. XIV. Fig. 2. Branch of a zoarium with an avicularium {a), 
X 14 dia. Cenomanian: Le Mans, Sarthe. Tesson Coll. D. 4523. 
