282 Annals of the Sonth African Museum. 



H. cenomanensis, Cotteau," which is stated by Duncan f to occur 

 commonly in the Cretaceous of the Lower Narbada region of India, 

 differs from H. Forbesi in being less contracted anteriorly, in 

 having the anterior ambulacral furrow narrower and shallower, in 

 the poriferous zones of the lateral ambulacra showing more marked 

 convergence at their extremities, and in possessing fewer and more 

 widely separated tubercles. 



Hemiaster is abundantly represented in the Upper Cretaceous 

 deposits of Algeria and Tunis, from whence 45 species have been 

 described. One of these, H. Bollandi, Thomas and Gauthier,J 

 resembles H. Forbesi in general form, in its deep ambulacral 

 furrows, and in the inward bending of the fasciole behind the antero- 

 lateral ambulacra. But it differs in its more elongate outline, and 

 the more excentric position of the apical disc ; also the antero- 

 lateral ambulacra are narrower and diverge at a smaller angle. 



Remarks. — Baily's description was based on a single internal cast 

 and some fragments of the test. The specimens collected by the 

 Survey and by Griesbach have their tests preserved in excellent 

 condition, and have rendered a more detailed description possible. 

 The type is in the Museum of the Geological Society of London. 



POLYZOA. 



By W. D. Lang, M.A., F.G.S., British Museum (Nat. Hist.). 



The specimens are for the most part very well preserved in a 

 matrix of hard, dark, greenish-yellow sand containing shell fragments. 

 Six species are represented. 



Genus BERENICEA, Lamouroux. 



Berenicea gracilis (M. Edwards). 



1838. Diastopora gracilis, M. Edwards, Annal. Sci. nat., 2nd ser., 



vol. ix., Zool., pp. 237, 229-230, pi. xiv., fig. 3. 



Specimen 5a consists of two discoid zoaria of this species encrusting 



a large foliate zoarium of Elea meridiana, sp. nov. The zoaria 



* Cotteau and Triger, Echin. Depart, de la Sarthe (1859), ]). '210, pi. xxxiv., 

 tigs. 7, 8. 



t Q.J.G.S., xliii. (1887), p. 152. 



\ Explor. Sclent. Tunisie. Desciipt. Echin. Foss. (1889), p. 17, pi. i.) 

 figs. 14-16. 



