of Cretaceous Gheilostoine Polyzoa. 7 



which has them fiently curved, and H. gracilis, d'Orhigny,' in which 

 the sides are nearly straight. 



Type-specimen. — British Museum specimen, D. 20607 ; Senonian 

 [zone of Belemnitella miicronata] ; Norwich ; T. G. Bayfield 

 Collection. 



Distribution. — Senonian, ahove the zone of Marsupites. 



Hekpetopora danica, n.sp. PI. II, Figs. 6-7. 



A third species of Uerpetopora is represented by two specimens in 

 the British Museum from the Danian of Faxe, Denmark ; and another 

 specimen from the mucronata zone of Norwich is in the collection of 

 Dr. Rowe, who kindly lent it to me for examination and desoription. 

 Other species which probably should be placed in this genus are 

 Hippotlioa labiafa, Novak, from tlie Cenomanian of Bohemia ; 

 JI. desiderata, Novak, from the lowest Senonian of Bohemia ; 

 J[. crticiata, Reuss, from the Turonian of the Austrian Tyrol ; and 

 II. gracilis.^ d'Orbigny, from the Senonian of Tours, Indre-et-Loire.- 



Diagnosis. — Uerpetopora with large zocEcia tapering somewhat 

 distally, with oval rather than elliptical^ termens, and with very 

 short caudal portions. 



Remarks. — The shorter termens and caudal portions as well as the 

 large size of the zooecia distinguish II. danica from H. anglica, which 

 it otherwise resembles. 



Type-specimen. — British Museum specimen, D. 19429; Danian; 

 Faxe, Denmark ; J. W. Davis Collection. 



Distribution. — Senonian, zone of Belemnitella mucronata ; Thorpe 

 St. Andrew, Norwich (A. W. Rowe Collection). Danian ; Faxe, 

 Seeland, Denmark (British Museum specimens, D. 19429, D. 9113, 

 J. W. Davis and Miss Caroline Birley Collections). 



KEY TO THE GENUS HERPETOPORA. 



A. Zooecia tapering at both ends. 



1. Termen regularly elli])tical or oval ; zooecia with caudal portions 



very straight. 



a. Termen oval rather than elliptical ; caudal portions of zooecia 



very short or absent ..... H. danica 



b. Termen elliptical rather than oval ; caudal portions of zooecia 



very long (except as a neanastic character) . H. anglica 



2. Termen irregularly elliptical ; capitular and caudal portions of 



zooecia slightly wavy . . . . H. labia ta (Novak) 



3. Termen irregularly elliptical ; zooecia, especially the caudal portions, 



wavy ; zooecia sometimes tend towards a pear-shape as 

 in B H. desiderata (Novak) 



B. Zooecia tapering proximally and ending fairly abruptly distally. 



1. Proximal capitular parts of zooecium bounded by nearly straight 



lines H. gracilis (d'Orbigny) 



2. Proximal capitular parts of zooecia bounded by gently curved 



lines H. cruciata (lleuss) 



3. Proximal capitular j)arts of zooecia bounded by sharply curved 



lines H. clavigera 



^ D'Orbigny, loc. cit. 



" For references to the original descriptions of these species see footnote 

 under Uerpetopora anglica on p. 6. 



^ Oval and elliptical used in the botanical sense, as defined, for instance, in 

 Asa Gray, 1879, Structural Botany, p. 95. 



