84 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.61. 



tion and that with the operciihim inserted in a circle, the diameter 

 of the latter ought to correspond to that of the tentacular sheath. 



The ovicell belongs to a short type already noted in Meliceritites 

 transversa new species and Meliceritites se?niclausa, variety Gregory, 

 1899. It is triangular, very convex, as broad as long. The oecio- 

 stome is supported on the facette of the superior zooecium ; it is ellip- 

 tical and transverse (fig. 3). 



The micrometric measurements of the facettes are rather change- 

 able, especially in width (figs. 3, 4). The aperture itself can vary 

 from 0.15 to 0.18 mm. The width of the facettes, 0.34 mm., given by 

 Gregory is an extreme case and rather rare. The zoarial diameter 

 is also variable, for the colonies appear to be very large ; our speci- 

 mens are 2 mm. in diameter, but the measurement of 2 to 5 mm. given 

 by Gregory is quite possible. 



Levinsen, 1912, has noted closed zooecia (kenozooecia), while 

 Gregory, 1899, and Levinsen, 1912, have indicated the perforated 

 facettes. We have not observed this particular case but they ara 

 quite natural. 



ccui^ence. — Cretaceous (Cenomanian) : Essen, Germany, The 

 species has been found with certainty in no other locality. It is re- 

 grettable that Gregory chose it as the genotype of Eoemer's genus 

 Meliceritites^ 1840, because Roemer misidentified the species himself 

 (see Entalophm'a roemeri Levinsen, 1912). The synonymy of the 

 species contains only the references given above. 



Plesiottjpe.— Cat No. 68935, U.S.N.M. 



MELICERITITES ANGULOSA D'Orbigny, J 852 



Plate 12, figs. 17-22. 



1912. ileliccritites angiilosa Levinsen. Studies on the Cyclostomata Oper- 

 culata, Memoires Academie Royale Sciences et Lettres de Dauemark, 

 scr. 7, vol. 10, p. 23, pi. 2, figs. 4-22 (bibliograpliy). 



This species, which is very common in France, has been figured 

 under many names by D'Orbigny. Canu retained the name of ornata 

 in 1899, but Levinsen preferred the one which was printed first by 

 D'Orbigny (p. 610, Paleontologie franraise). 



On plate 12 we figure a curious ovicelled specimen in which the 

 oeciostome is transformed into an eleocellarium. 



Occur7'ence. — Cretaceous (Coniacian) : Fecamp (Seine inferieure), 

 Villedieu (Loir-et-Cher), Tours, Saint Paterne (Indre-et-Loir), and 

 Phelippeaux (Charente), France; Chatham, England. 



Cretaceous (Santonian) : Coulommiers near Vendome (Loir-et- 

 Cher), Barbezieu, Bedocheau and Champagnac (Charente), France. 



