90 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



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Fig. 19. — Genus Sarsiflustra Jullien, 1903 

 A-F. Sarsiflustra abyssicola Sars, 1872. A. Portion of colony, frontal face, 

 X25. B. Superior part of a zooeciurn bearing the velum replacing the ovicell. 

 C. Superior part of a zooecium showing the arrangement of the vaginular system, 

 evacuator of the larva. (A-C, after Jullien, 1903); oe, exterior orifice of vagi- 

 nulum; oi, internal orifice of vaginulum; op, operculum; oz, zooecial orifice and 

 tentacular sheath; v, velum; va, vaginulum. D. Zooecia viewed by trans- 

 parency and showing many anatomical details. The left hand avicularium is 

 shown open, the right closed, X25 (after Waters, 1889). E. An avicularian 

 mandible to show the internal cavity, X 13. F. A transverse section through 

 the same mandible in its middle part, X23. (After Levinsen, 1909.) 



Fig. 20. — Genus Kenella Levinsen, 1909 

 A-E. Kenella biseriata Busk, 1884. A. Zoarium showing the chitinous cal- 

 careous band, cb, X4. B. Same zoarium, X25, showing the immersed ovicells 

 (endozooecial) and the lateral chitinous tubes. C. Transverse section, showing 

 distal septulae, the bordering chambers (bch) and section of the projecting 

 chitinous tube, X25. D. Transverse section, of bordering cells (bch) as Figure 

 B, showing the chitinous calcareous band (cb) X 150. E. Lateral wall with 

 septulae, X25. (A-E, after Waters, 1896.) 



