MELICEEITITES. 
341 
Diagnosis. 
Zoarium of thin (1 - 1-5 mm.), dichotomous branches. Zooecia 
hexagonal or lozenge-shaped, with raised borders. 
Apertures in regular, transverse rows ; triangular, with rounded 
angles. 
Avicularia twice as long as the zooecia, with long, triangular 
apertui’es. 
Closed zooecia numerous ; the cap is sometimes biporous. 
DliTEXSIOXS. 
Diameter of branch 1-5 mm. 
Diameter of zooecia ... ... ... ... ... -33 ,, 
Diameter of aperture *17 ,, 
Disteieution. 
Britisu : 
Upper Chalk : Gravesend ; Beachy Head. 
Middle Chalk: Chatham. 
Foreign : 
Senonian : Carancy, Pas-de-Calais ; south of Les Roches, Loir-et-Cher. 
Turonian or Coniacian: Lavardin, Loir-et-Cher. 
Figures. 
PI. XVI. Fig. 3. Distal end of a branch, partly in the Ceid 
condition, with avicularium ; X 1 6 dia. Middle Chalk : Chatham. 
Gamble Coll. D. 3995. 
PI. XV. Fig. 2. Part of a zoarium (possibly of this species), 
with a closed zooecium, and a notched aperture (? an inverted 
avicularium). Upper Chalk : Gravesend. Vine Coll. D. 630. 
PI. XV. Fig. 3. Part of a worn zoarium, X 18 dia. Upper 
Chalk : Beachy Head. D. 7107. 
PI. XV. Fig. 4. Part of another zoarium, X 11 dia. Middle 
Chalk : Chatham. Gamble Coll. D. 489. 
LIST OF SPECIMEXS. 
D. 3995. One branch, and a long thin branch of probably the same species 
(onshde). Middle Chalk. Chatham. Gamble Coll. Figd. Pl.XVI. 
Fig. 3. 
?D. 630. A small fragment with probably an inverted avicularian aperture. 
Upper Chalk. Gravesend. Vine Coll. Figd. PL XV. Fig. 2. 
D. 7107. A worn zoarium with some biporous closed zooecia and the zooecia 
approximating to the Ceid form. Upper Chalk. Beachy Head. 
Presented by the author. Figd. PI. XV. Fig. 3. 
