8 Annals of the South African Museum. 



two or three in a lateral series ; those of different series distant four 

 or five diameters of an aperture, those of the same series two to three 

 diameters of an aperture. 



A single specimen is somewhat doubtfully referred to this species. 

 It is the proximal end of a zoarium, though the first few zooecia 

 appear to be missing. Beginning as a thin, cylindrical branch, the 

 zoarium rapidly widens and becomes compressed in a plane parallel 

 to the obverse and reverse faces, at the same time becoming very 

 curved, so that in a section along the proximal-distal axis the obverse 

 face appears convex and the reverse face concave. When the 

 breadth of the zoarium has reached about one-third of its length, 

 it divides into two subcylindrical branches ; one of these is broken 

 off short, but the other continues for about T5 mm., without altering 

 in shape. It would be interesting to know if on further growth the 

 branches flatten and widen, thus recapitulating the growth stages of 

 the first part of the zoarium ; * or whether the first part is really an 

 encrusting portion, whose support has decayed, which has thrown 

 up cylindrical branches in the same way as a Phalangella-like base 

 has been shown by Gregory f to throw up branches of the genus 

 Crisina. The general zooecial characters are those of Tervia decurrens 

 (Pocta), in which species it is provisionally placed. 



Distribution. Cenomanian. 



ENTALOPHOKnm 



GENUS ENTALOPHOEA, Lamouroux. 



ENTALOPHOBA VIRGULA (von Hagenow). 

 Plate I., fig. 10. 



1840. Ceriopora virgula, von Hagenow, Mon. Kiig. : Neu. Jahrb., 



1840, p. 646. 

 1851. Pustulipora virgula, von Hagenow, Bry. Maastr. kreide., 



p. 17, pi. i., fig. 3. 



Zoarium consisting of smooth cylindrical branches ; the apertures 

 are irregularly distributed on the zoarium and are very far apart, 

 their distance apart in a proximal-distal direction being generally 

 more than four times the diameter of an aperture. There are never 

 more than two apertures in the breadth of a branch. The zorecia 



* See W. D. Lang, Geol. Mag., 1905, pp. 259-260. 



f J. W. Gregory, Brit. Mus. Cat. Cret. Bry., vol. i., 1899, p. 159, text-fig. 11. 



