14 VINE: CAMBRIDGE GREENSAND. 
anastomosing-. ZocBcia (generally) in a single series, thick and 
occasionally bulging at the nodes,* orifice circular, with a thin 
peristome. Ocecia an inflated cell with orifice depressed. 
Range of variation. — This species varies very much in the 
cretaceous rocks ; the Greensand forms, generally speaking, differ 
from those found in the Upper Chalk, but chiefly in the length and 
delicacy of the cells. There is only one poor specimen in Mr. Jesson's 
collection, and by careful manipulation I have been able to give a 
figure of the species which I can only regard as the same, or at the 
most, a variety of the Upper Chalk S. gmcilis. 
Localities: Cambridge, Greensand ; Upper Greensand, Warmin- 
ster; Upper Chalk, Wilts (Phiflips); Beachy Head (Miss Jelly); 
Norwich, Sutton (Morris' Catalogue Brit. Foss.) 
2. — IDMONEA DORSATA, Hagenow. 
Idmonea dorsata Hagenow, Bry. der. Miis. tr. Kreid. form. 
= Retepora disticha (pt.) Golf. Petrefac. pi. IX., fig. 15. g. and h. 
There is only a single fragment of an Idnionse in Mr. Jesson's 
collection. It is similar to the form which Hagenow gives as 
the type of his /. dorsata^ but rather more delicate. The species is 
common in the Faxoe Limestone of Denmark. 
Localities: Cambridge, Greensand; Upper Chalk Meestricht beds ; 
Faxoe Limestone Denmark (Vine). 
3. — Entalophora>aripora D'Orb., Plate I., figs. 1 and 2. 
1850. Entalophora raripura D'Orb., Prodr. Pal. Strat. p. 2G7 : Pal. Franc, 
p. 787, pla. G21, figs. 1-3; pi. G23, figs. 15-17; Beissel. Biy. 
Auchener Kreidebildung, p. 82, pi. X., figs. 120-128 ; Novak (part) 
Beitr. z. Kenntn. d. Bry. der Bohm. Kreide., p. 32. (So Waters.) 
1851. Pustulopora virgula F. Hagenow. Bry. Mastr. p. 17, pi. 1, fig. 3. 
1883. Entalophora incerta Vine, Brit. Assoc. Rep. Foss. Pol. (For other 
Synonyms see Novak. Beitr. z. Kenntn. d. Bry. der. Bohm. Kreid., 
p. 32; A. W. Waters, Foss. Cyclostomatous Bry. Australia Quart. 
Jour., Geo. Soc, Vol. 40, p. 686.) 
Zoarium delicate or robust, erect and ramose, branches variable, 
ranging from subcylindical to cylindrical, bulging at the nodes, Zoceda 
tubular elongated, or depressed, partially decumbent, occasionally 
produced towards the distal extremity, opening on all sides ; cells 
*l have used the word 'node' to indicate the part just below the branching of 
the cells. 
