468 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



II 



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Fig. 199. — Genus Eulhyris Hincks, 1882 



A-M. Eulhyris oblecta Hincks 1882. A. On the marginal zooecia the peculiar 

 processes are seen, by which the covering membrane (ectocyst) is kept out- 

 stretched, X40. B. Four zooecia, from the basal surface. Besides the septulac 

 a number of filiform calcified elongations are seen; X40. C. A sagittal section 

 through two marginal zooecia. The internal lateral processes are visible and also 

 the connections between the cryptocyst and the covering membrane (ectocyst) : 

 X40. D. Sagittal section through ordinary zooecia; X40. E. The processes of 

 the lateral wall, from the outer surface, X40. F. Operculum, X 100. (A-F. 

 After Levinsen, 1909.) G. Part of the frontal surface of a branch, showing two 

 of the large zooecia (B) m. c, marginal cavity of frond; calc. p., calcareous papil- 

 lae supporting the frontal epitheca; p. pores. H. Basal view of a B-zooecium 

 from which most of the basal calcareous wall (b. to.) has been removed. The 



