480 



BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



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FIG. 135. Genus Cystisella Canu and Bassler, 1917. 

 A-J. Cystisella saccata Busk, 1856. A. Zoarium, natural size. (After Nordgaard, 1905.) 



B. Specimen boiled in caustic potash showing the large avicularian chamber, that of the left 

 zooeciurn broken away ; also showing the pores at the base of the avicularian chamber, X 25. 



C. The interior of a portion, X 85, in which there are no polypides showing the glands re- 

 duced to two small globes attached to the fleshy tissue. In the avicularian chamber there are 

 two very long muscles, and at the base there are the two characteristic pores. D. Section show- 

 ing the position of the oral glands (gl), which are behind the tentacles so that they are not 

 seen in the zooecia cut through near the frontal surface, (ov), ovum, X 25. E. Transverse sec- 

 tion showing the large oral glands (ffl), the avicularian sheath (ov), the tentacles (t) in their 

 sheath, esophagus (oe), caecum (c), testes (te), X 50. F. Oral gland, X 250. In the upper 

 part the cells are partly absorbed. G. Diagrammatic section, X 25, showing the frontal pore 

 connected through a rosette plate with the avicularian chamber, which farther down is simi- 

 larly connected with the zooecium. av. ch., aricularian chamber ; m, mandible ; op, operculum ; 

 ov, ovicell ; sch, zooecial chamber. H. Operculum, X 85. I, J. Avicularian, mandible, X 

 250 and X 85. 



K, L. Cystisella elegantula D'Orbigny, 1852. Operculum, X 85, and avicularian man- 

 dible, X 85. 



M-Q. Cystisella frarjilis Levinsen, 1916. M. Zooecia and ooecia, frontal surface. N. Aper- 

 ture, much enlarged. O. Operculum. P. Zooecia in lateral view. Q. Basal wall of the zooecia. 

 (After Levinsen, 1916.) 



