316 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



The costules are bound together by the intercostal cross pieces, producing at 

 the bottom of the intercostal spaces a line of lacunae; each costule is provided at 

 its talon with a large lumen pore. The aperture is formed of an anterior part 

 and posterior part separated by two cardelles; it is closed by a wholly chitinized 

 compound operculum. The ovicell is hyperstomial ; it is provided with a median 

 suture and with at least two pear-shaped perforations. The avicularia are inter- 

 zooecial. No dietellae. 



Genotype. Figularia (Lepralia) figularis Johnston, 1847. 



Range. Jacksonian-Recent. 



The species of this genus are : 



Figularia (Leprolia) figularis Johnston. 1847. 



Figularia (Hemesehara) philomela Busk. 1884. 



Figularia (Cribrilma) cUthridiata Waters, 1887. 



In the last the aperture of the ovicelled zooecia is very large. 



Levinsen believed that this genus had some relationship with the Membrani- 

 pora pyrula group. Its operculum and its compensatrix approach moreover Hippo- 

 porina, which is a true member of the Ascophora. 



It is doubtful whether this genus is represented in the Eocene of the United 

 States, but as it is the only one of which the anatomy has been studied, we have 

 illustrated it in some detail. 



The oral glands so often described by Waters are here the testicular glands 

 (Jullien). 



FIGULARIA (?) CRASSICOSTULATA. new species. 

 Plate 43, fig. 9. 



Description. The zoarium incrusts shells. The zooecia are little elongated, 

 wide, elliptical, separated by a furrow; the frontal is convex; the costules are 

 thick, transverse, separated by a small initial slit followed by two or three lacunae, 

 in number from 8 to 10 pairs. The aperture of the ordinary zooecia is formed 

 of an anter much arched and a poster a little wider and nearly straight, separated 

 by two small cardelles: the peristome bears laterally two small tuberosities ; the 

 aperture of the ovicelled zooecia is larger and transverse. The ovicell is hyper- 

 stomial and exteriorly very convex; it is formed of two calcareous deposits, of 

 which the outer one is incomplete, and leaves two cicatrices in the form of a crescent. 

 The avicularium is interzooecial and large and wide. 



,. [Aa=0.08mm. 



Measurements. Ordinary aperture _ ni n 



v . JA=0.10 mm. 



Ovicelled aperture , 



Ua=0.15 mm. 



. [3=0.73 mm. 

 /ooecias . 



\lz= 0.30-0.40 mm. 



Affinities. This species differs from Cribrendoccium tenuicostulatum in the 

 greater size of its costules and in its hyperstomial ovicell. There is no pore on 

 the shield of the costules as in all the other species of this genus. 



