336 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Family EURYSTOMELLIDAE Levinsen, 1909 



We have reproduced practically all that is known of this family in 

 our 1923 work and have here also illustrated the two species referred 

 to the family. Eurystomella Levinsen, 1909, is the only known genus. 



Fig. 136. — Genus Pseudoflustra Bidenkap, 1897 



A-I. Pseudoflustra solida Stimpson. A, B. Zoarial fronds, natural size. 

 (After Vigelius, 1882.) C. Zoarium with numerous tubular fibers which pass 

 downward from various points on both the surfaces of the zoarium, uniting below 

 to form a kind of stem. D. Zooecia with ovicells and long frontal avicularia. 

 (C, D. After Hincks, 1880.) E. Zooecia with much-developed peristomes and 

 short salient frontal avicularium. F. Showing the connection between the 

 epidermal covering of the cell and the tubular fiber. G. Outline of orifice of 

 smaller form. H. Same of larger form. (E-H. After Hincks, 1892.) I. Form 

 of the #pertura. (After Levinsen, 1887.) J. Operculum X85. K. Mandible 

 of the avicularium, X250. L. Transverse section showing the two distal sep- 

 tulae. (I-L. After Waters, 1900.) 



Family SMITTINIDAE Levinsen, 1909 



Wo have described and illustrated this family and its various 



genera in our 1920 work with the exception of the two genera Mal- 



leatia and Marguetta Jullicn, 1903, now referred here, descriptions of 



which follow: 



Genus MARGUETTA JuIIien, 1903 



The aperture is semilunar with neither lyrule nor cardelles; the 

 anter is formed conformable to a curve which plunges at 45° below 



