234 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



middle sections of two zooecia of the succeeding internode, and the 

 still smaller proximal sections of two zooecia of the next internode 

 but one. Avicularia sessile or pedunculate, borne by the middle 

 sections of the zooecia, the mandibles acute. Gonozooecia formed 



Fig. 95. — Family Beaniidae, Canu and Bassler, 1927 



A-D. Diachoris costata Busk, 1852. A. Female zooecium containing a larva 

 very well developed, placed in an ovicell sac (not drawn). The polypide is 

 very small, X50. B. Arrangement of the principal elements of a zooecium, 

 X 100. C. Avicularium with its muscles. The flexor muscle of the mandible is 

 very much developed. D. Ovary appearing in the form of the vesicle of Graaf, 

 with many ovules. (A-D. After Jullien, 1888.) 



E-L. Diachoris magellanica Busk, 1852. E. Dorsal of a zooecium bearing a 

 thick radicell terminated by an adherent disk finely denticulated on its edge, X34. 

 F. Frontal of a zooecium showing the internal organization. (E, F. After 

 Jullien, 1888.) G. Egg mass, X250. H. Section in a zoarium showing position 

 of egg masses, X25. (G, H. After Waters, 1896.) I. Connecting tube with 

 two septa, X190. The parenchym threads are attached to both and pass 

 through the junction. J. Avicularium, X85. Besides the large adductor 

 muscles (fig. C) there is a semicircular row of short muscles, which no doubt 

 contracts the integument behind the mandible and thus helps in the slow opening 

 of the beak. (After Waters, 1896.) 



by the enlargement of certain individuals, ovicells wanting. (Harmer, 



1926). 



Genus EPISTOMIA Fleming, 1828 



(Notamia Fleming, 1828, preoccupied) 



The zooecia are united laterally in pairs; each pair arising by 

 tubular prolongations from the pair next but one below it; at each 

 bifurcation a new series of cells is intercalated into the branches. 



