34 THE CRAG POLYZOA. 



Polyzoarium spreading, reticular ; aperture occupying the whole front of the cell ; 

 margin projecting above, smooth ; large, elongated, lanceolate avicularia interspersed among 

 the cells. 



Habitat. — C. Crag, 8. W., on Tereb. grandis, spreading over Lepralia punctata. 



9. M. OBLONGA {n. sp.) PL 11, fig. 3. 



Polyzoario effuso, irregulari ; areis oblongis, rectangularibus ; lamina utrinque punctata ; 

 septis glabris, longitudinaliter sulcatis ; orificio semiobiculari, labro inferiori recto ; 

 tuberculo rotundato utrinque supra aperturam. Ovicellulis immersis, inconspicuis. 



Polyzoarium spreading irregularly ; area of cell oblong, rectangular ; lamina punctured 

 at the sides ; septa smooth, sulcate ; orifice semicircular above, with a straight lower Up ; 

 slightly raised ; a rounded tubercle on each upper angle ; ovicells deeply immersed ; 

 inconspicuous. 



Habitat. — C. Crag, on Pecten, and pebble, 8. Wood. 



10. M. BiDENS, Hagenow. PL II, fig. 4. 



Areis ovalibus, supra arcuatis j infra truncatis ; cellulis clausis ; superficie anteriori 

 convexa, glabra ; orificio terminali, semilunari, labro inferiori dentibus duobus latis armato, 

 ovicellulis immersis, inconspicuis. 



Area oval, arched above, truncate below ; front of cell convex, smooth ; orifice quite 

 at the summit, crescentic; lower hp with two broad teeth; septa smooth, sulcate, or 

 simple ; ovicells immersed, inconspicuous. 



Cellepoka BIDENS, Hagenow, Bryoz. Maas. Kreideb. p. 9, p!. xi, fig. 16. 

 Cellepora hippocrepis (?), Reuss, Foss. Pol., W., T. Beck., p. 95, pi. xi, fig. 14. 



Habitat. — C. Crag, on Fecten and other shells and pebbles, 8. W. Chalk formation, 

 Maastricht, Hagenow, Goldfuss. 



Hagenow's figure of M. bidens appears to correspond in every respect with that of the 

 Crag fossil, which is, therefore, referred to his species. The form of the cell and of the 

 orifice in M. (C.) hippocrepis, Goldf., and of which a figure is also given by Hagenow 

 (ib., fig. 17), appears to approach very nearly to that of M. bidens, so nearly, in fact, as 

 almost to lead to the suspicion that the two forms are very intimately related, especially 

 when it is remembered that they both occur in the same locality. A very considerable 

 difibrence, however, in size, is apparent between the two; and although this may not 



