EEPTOilinLTISP AUSA . 
121 
But the growth of the zoarium as a series of zooecial discs is 
diderent from that of Cellulipora ; the zoarium, in fact, is a com- 
pound Berenicea, not a compound Discosparsa. 
D. 2991. A zoarium from Upper (?) Chalk, near Maidstone. Old Coll. 
4. Reptomultisparsa rowei, nov. 
SrxoNTnY. 
Diastopora eongesta (no i Reuss), d’Orbigny, 1851. Bry. Cret. pi. 640, figs. 1-3. 
Peptomultisparsa eongesta, d’Orbigny, 1854. Ihid. p. 878. 
Diastopora confluens (non Reuss), d’Orbigny, 1851. Ibid. pi. 640, figs. 4-6. 
,, papillosa, pars, Pergens, 1890. Revision, p. 334. 
Diagnosis. 
Zoarium of elliptical or slightly irregular discs, piled upon one 
another. The series usually decreases gradually in size fi’om 
the lowest to the youngest zooecial gi’oup. But in some cases 
the uppermost layer expands laterally and buides the rest. 
Zooecia of medium length and diameter, Apeidui-es close 
together, and regularly distributed. In old zooecial groups 
there is a peripheral belt of crowded apertures. Peristomes low. 
Gonocysts ? 
Dimensions. 
Diameter of zoarium 
Distance of apertures in same 
longitudinal series 
Diameter of zooecia 
Diameter of aperture 
B.M., D. 3944. 
7 mm. 
•4-*7 „ 
•15--25 „ 
•06--1 „ 
Distribution. 
England : 
Upper Chalk : Off bam, near Lewes. 
Middle Chalk : Chatham. 
Foreign : 
Senonian — Santonian : Saintes, Charente-Inferieure. 
Coniacian: Tours, Indre-et-Loire; Yarennes, Loir-et-Cher. 
Figures. 
PI. YII. Fig. 1. Part of a zoarium, including four super- 
imposed zooecial groups; X 10 dia. Middle Chalk: Chatham. 
Gamble CoU. D. 3944. 
Affinities. 
ReptomuUisparsa rowei differs from R. eongesta owing to the 
greater diameter and shorter length of the zooecia. The zoaria of 
