440 W. D. Lang — Cretaceous Cheilostome Polyzoa. 



oval-ovate, occupying about two-thirds of the length of the 

 capitulum ; avicularia very small; one (or occasionally two) on many 

 of the caudae, with oval apertures, constricted rather distally of the 

 middle. Sealed zooecia rare. 



Distribution. — Upper Senonian, zone of Belemnitella 77iucronata : 

 Kiigen I., German Baltic. 



Remarks. — Marssou (for reference see synonymy) does not mention 

 either the beaded termen or the avicularia, nor do his figures show 

 these characters (though the avicularia appear in Geinitz's figure, 

 see above). They become, however, strikingly clear when the 

 specimen is painted with some dark colour. Doubtless the lack of 

 some such method was the cause of Marsson's overlooking these 

 points; for there can be no doubt of the identity of the Eiigen 

 specimens (British Museum specimens D. 11498, D. 15376, and 

 D. 15423) showing these characters with M. dispersa as interpreted 

 by Marsson. 



It has been shown already that of the three genosyntypes of 

 d'Orbigny's genus Pyripora, Escharina crenulata^ Reuss, must be 

 taken as the genotype. The other two species were Escharina 

 dispersa, Eeuss [non Hagenow), and Escharina perforata, Reuss. 

 A glance at Reuss' figure of Escharina dispersa will show that it is 

 not Cellepora dispersa, Hagenow (just described as Marssonopora 

 dispersa), since the front wall is complete. But beyond this, and 

 that it is uniserial, it is difficult to say from the figure what its 

 affinities are. There is, however, an undescribed uniserial Cheilostome 

 occurring rarely in the English Chalk, with a complete front wall, 

 and Escharina dispersa, Reuss, may be placed provisionally in the 

 genus now made for its reception. 



- Daceyopora, n.g.' 

 Sy7ionymy .'^ 



Diazeuxia (partim), Canu. 



Escharina (partim), Bronn, ? Morris, Eeuss, Vine. 



Hippothoa (partim), Gabb & Horn, Manzoni, d'Orbigny, Pictet, Vine. 



Membranipora (partim), ? Vine. 



Microporella (partim), Vine. 



Pyripora (partim), d'Orbigny. 



Diagnosis. — Incrusting, uniserial Cheilostome Polyzoa, normally 

 with bilateral branching ; zooecia monomorphic, divided into a proximal 

 caudal and a distal capitular portion ; termen, except distally, 

 indicated by a contour on the complete front wall at which the slope 

 of the front wall changes ; distally it coincides with the lateral and 

 distal edges of the orifice, and bears one or more pairs of spines ; extra- 

 teraiinal front wall comparatively small and slightly arched ; intra- 

 terminal front wall entirely calcareous, highly arched, often bearing 

 a median ridge; aperture semicircular or slightly cribrilinid.^ 



Genotype. — Dacryopora gutta, new species. 



Distribution in time. — ? Cenomanian to Senonian. 



^ t6 ^6.Kpv, ' a tear,' ' a drop,' from the shape of the zocecium. 



^ For references see these authors' names under the several species. 



•" i.e. of the general shape of the orifice in the family Cribrilinidas. 



