438 W. D. Lang — Cretaceous CJteilostome Polyzoa. 



comparatively large (about 6 mm. in a proximal-distal direction 

 and '4 mm. at right angles to this) ; termen bearing eleven beads, 

 one median and proximal, and five paired decreasing in size distally ; 

 proximal part of the extra-terminal front wall short compared with 

 the aperture ; intra-terminal front wall a very narrow bevel ; aperture 

 large, occupying most of the capitular portion of the zocecium and 

 nearly a half of its whole length, oval. Sealed zooecia rare or absent. 



Didrihution. — Danian, Vincentown Liraesand : New Jersey, U.S.A. 



Remarks. — The beaded termen, characteristic of the genus Allanto- 

 2>ora, is not shown in the figures of A. irregularis hitherto published; 

 it is very apparent, however, in the British Museum specimen here 

 figured (D. 19186) from the Vincentown Limesand, New Jersey, and 

 undoubtedly belonging to this species. 



Allantopora stomatopoeoides,^ n.sp. (PI. XXXIV, Fig. 2.) 



Diagnosis. — Allantopora with a short caudal portion to the zooecia 

 and a capitular portion that is cylindrical rather than pear-shaped 

 and tapers very gradually into the caudal portion ; the capitular 

 portion is small, about '5 mm. in a proximal-distal direction, and 

 •3mm. at right angles to this; termen with about twelve beads; 

 extra-terminal front wall very large, occupying at least the proximal 

 half of the capitulum as well as lateral areas in the distal portion ; 

 aperture oval, small in correlation with the great development of the 

 exti'a-terminal front wall. 



Type-specimen. — British Museum specimen D. 9110; Caroline 

 Birley Collection. 



Distribution. — Danian : Paxe, Seeland, Denmark. 



Synonymy.- Makssoi^opora,^ n.g. 



Aulopora (partun), Geinitz, Pictet. 

 Cellepora (partim), Boll, Hagenow. 

 Hipjpothoa (partim), Marsson, d'Orbigny. 



Diagnosis. — Incrusting, uniserial Cheilostome Polyzoa, normally 

 with bilateral branching; zooecia dimorphic; normal zooecia with 

 capitular and caudal portions, sometimes sealed; termen beaded; 

 extra-terminal front wall Avell developed proximally, plain, with no 

 median groove or ridge ; intra-terminal front wall represented by 

 a narrow bevel, somewhat wider proximally; apertures oval-ovate; 

 avicularia small, situated on the caudal portions of the normal zooecia. 



Genotype. — Cellepora dispersa, Hagenow. 



Distribution. — Upper Senonian. 



Remarks. — Of the different genera in which Marssonopora dispersa 

 has been placed, Aulopora is a genus of Palaeozoic Corals ; Cellepora 

 was founded by Linnseus* for Kecent multiserial forms with complete 

 front walls ; and Hippothoa also has complete front walls. 



^ Invented to mean ' resembling a Stomatopora ', from the cylindrical shape 

 of the zooecia. 



^ Named after Theodor Marsson, the monographer of the Chalk Polyzoa 

 of Eiigen. 



' For references see p. 439. 



* LinnsBus, Systema NaturcB, 12th ed., vol. i, pt. ii, p. 1285, 1766. 



