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BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



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; 

 extraterminal front wall comparatively small and slightly arched; intraterminal 



front wall entirely calcareous, highly arched, often bearing 

 a median ridge; aperture semicircular or slightly cribrilinid. 

 (After Lang.) 



Genotype. Dacryopora gutta Lang, 1914. 

 Range. Cenomanian-Senonian. 



Genus HARMERIA Norman, 1903. 



1903. Harmeria NORMAN, Notes on Natural History of East Fin- 

 mark, Annals and Magazine Natural History, ser. 7, 

 vol. 12, p. 107. 



" The zooecia lack a covering membrane ; the cal- 

 careous matter is very thin and brittle and there are no 

 spines. They present a larger or smaller distinctly 

 defined frontal area, provided with numerous pores. A 

 compound operculum, feebly chitinized. Rosette plates 

 with few pores. No ovicell and no avicularia. The disci- 

 form colony presents two different sizes of zooecia. larger 

 inner and small outer." (Levinsen, 1916.) 



Genotype. Harmeria (Lepralia) scutulafaHusk. Recent. 



FIG. 97. Genus Dacryopora 



Lang, 1914. 



Dacryopora gutta Lang, 

 1914. (After Lang.) Two 

 zooecia, X 20. Senonian, 

 Chatham, Kent,' England. 



Family ESCHARELLIDAE Levinsen, 1909. 



The ovicell is hyperstomial. The operculum is rigid and chitinous; it closes 

 the aperture, the compensatris and often the ovicell; its form is in rapport with 

 the hydrostatic system and the 

 passage of the eggs into the ovi- 

 cell. 



Historical. This family is the 

 reunion of the old families of 

 Microporellidae, Myriozoidae and 

 Escharidae (part) of Smitt and 

 Hincks. Levinsen, in 1909, having 

 proved the identity of the larvae 

 formed the family of Escha.relli- 

 doe, but the name is badly chosen, 

 for it is based on an archaic 

 genus which the more recent 

 work will not permit us to em- 



A B 



FIG. 98. Genus Harmeria Norman, 1903. 

 A, B. Harmeria scutulata Busk. (After Levinsen, 1916.) 

 A. Colony with an ovate membraniporoid ancestrula sur- 

 rounded by five large and three smaller zooecia. B. An- 

 cestrula with the five surrounding larger zooecia. 



ploy. 



Division. According to the form of the operculum we may class the numerous 

 genera of this family in the following four large groups, although there are some 

 aberrant genera: 



Schizoporellae. Microporellae. 



Hippoporae. Peristomellae. 



