Geneea of the ISToRTH American Palaeozoic Bryozoa. 609 



Fig. 56. A transverse section of a portion of the frond, xl8. 



Fig. 57. An impression in the rock made by the summits of the carinae and scales. 



Skmioobcinium, Prout. 

 (Trans. Acad. Sci. St. Louis. 1858.) 

 Type, Semicoscinium rhomboideum^ Prout. 

 This genus is probably a synonym for Unitrypa, but as the 

 original specimens can not be referred to and different opinions 

 are entertained of it by authors the name Unitktpa must stand. 



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A photo-engraving of the original illustrations, by Prout, is here 

 given. 



