18 University Geological Survey of Kansas. 



Fort Scott, Marmaton, Bourbon county, Thayer, Olathe, Kan- 

 sas City, Lawrence, Lecompton, Topeka, McFarland, Grand 

 Summit. Common throughout the Coal Measures. 



In young specimens, the septa, except the cardinal, do not 

 reach quite to the columella. 



Lophophyllum westi. Plate II, figs. 8, 8b; plate III, fig. 12. 

 Amplexus westi Beede, Kans. Univ. Quart., vn, p. 17, (1898). 



Corallum simple, subcylindrical to attenuate-conical, straight, 

 curved or geniculated, epitheca thin, longitudinal striae promi- 

 nent, and concentric lines and undulations of growth distinct. 

 The septa extend about half the distance to the center, 18 to 24 

 or more in number ; the counterseptum extends to the center, 

 where it is somewhat enlarged ; others of about equal length ; 

 indications of secondary septa visible but very small. The 

 tabulae are well developed 1 to 3 millimeters distant and 

 reaching from wall to wall ; on leaving the walls they are di- 

 rected obliquely upward for a short distance, and then, slightly 

 arching and undulating, cross the center, occasionally branching 

 at or near the bend. Length, 60 mm. ; diameter in larger part, 

 9 mm. 



Range and distribution : Upper Coal Measures ; Kansas City, 

 Lecompton, Neosho county. 



This species is very variable in size and shape as well as de- 

 gree of development of the septa. It was at first referred to the 

 genus Amplexus, as it seemed to have no columella, but more 

 material showed that many of the specimens had the cardinal 

 septum prolonged to or beyond the center and slightly enlarged, 

 which seems to make it agree more closely with Lophophyllum 

 than Amplexus. That the species is intermediate between the 

 two genera there can be but little doubt, as different specimens 

 of the same species seem to possess the characters of each genus 

 about equally. 



It is the fossil usually identified by collectors as Cyathaxonia 

 distorta Worthen, and indeed there is no external difference 

 visible (judging from Worthen's figures) in the smaller, more 

 distorted forms. But if his species is a true Cyathaxonia it is 



