KONINCKOPHYLLUM 



51 



stones and the corniculum phase seems most 

 common in pure limestones. 



This species can be recognized by 

 the periodically and irregularly swollen 

 ''nodes," by the generally oblique tabulae, 

 and by the small size. 



C . corniculum rtsemhlts C. cornucopiae in 

 size, shape, presence of dissepiments only in 

 late ephebic stages, characteristics of cardi- 

 nal fossula, lanceolate septa, long counter 

 septum, down- turned tabular margins, and 

 retreat of septa in late stages. It differs in 

 having slightly depressed axial portions of 

 tabulae, septa of counter quadrants some- 

 times thickest, and in having septa meeting 

 axially only in very early stages. 



Many specimens of C. corniculum do not 

 have dissepiments, in which case they are 

 apt to be confused with Ample xus. 



Family Clisiophyllidae Nicholson and 

 Thomson, 1883 



Genus KoNiNCKOPHYLLUM Thomson and 

 Nicholson, 1876 



''Simple or dendroid Rugose corals with clisio- 

 phylloid septa and fossula; the major septa are 

 withdrawn from the axis except along the sur- 

 face of the tabulae, the minor septa long; the 

 tabulae are tent-shaped, and dissepiments fine and 

 concentrically arranged ; a styliform columella \^ 

 present. Diphymorphs may occur." (Hill, 1939, 

 p. 86.) 



Genotype. — Koninckophyllum magnifi- 

 cum Thomson and Nicholson, 1883. 



Occurrence. — Lower Carboniferous (typ- 

 ically" Tourriaisian) of British Isles, Bel- 

 gium, Russia, China, Canada, United States. 



Remarks. — For a review of the systematic 

 position of the genus and a discussion of its 

 relationships and occurrence, see Hill 

 (1939, pp. 85-89). The writer agrees with 

 her that Koninckophyllum is a recognizable 

 genus. Hill (1939, p. 85) considers Axo- 

 phyllum Thomson, 1877, Acrophyllum 

 Thomson, 1883, Eostrotion Vaughan, 1915, 

 and possibly Lophophylloides Stuckenberg, 

 1904, to be junior synonyms of Konincko- 

 phyllum, but Axophyllum Milne-Edwards 

 and Haime, 1851, and Acrophyllum Thom- 

 son and Nicholson, 1876, are believed to be 

 distinct. 



Koninckophyllum glabrum (Keyes) 

 Plate 7, figures 1-5 ; Plate 17, figure 10 



Cyathophyllum glabrum Keyes, 1894, Missouri 

 Geol. Survey, vol. 4, p. 105, pi. 12, figs. 6a, b. 



Cyathophyllum glabrum, Van Tuyl, 1925, Iowa 



Geol. Survey, vol. 30, p. 110. 

 Cyathophyllum glabrum, Moore, 1928, Missouri 



Bur. Geol. Mines, ser. 2, vol. 21, pp. 154, 195. 



Externals. — Simple, sharply curved cera- 

 toid, may be slightly flattened on convex 

 side (right cardinal quadrant of one speci- 

 men) ; epitheca marked by encircling striae, 

 rugae, very sharp constrictions at rejuvenes- 

 cence; interseptal ridges faint but persis- 

 tent; calicular boss prominent in young 

 specimens. 



Transverse sections. — At late ephebic 

 stage (diameters 24 by 26 mm), 80 septa, 

 half about one-third as long as long majors; 

 majors extend about one-half of radius; car- 

 dinal fossula small, deep, with three or four 

 reflexed tabulae ; cardinal septum about half 

 as long as lateral majors; dissepimentarium 

 half as long as majors, with about 4 ranges 

 of concentric dissepiments; pseudo-lons- 

 daleoid dissepiments may exist because of 

 transection of two or more stages of re- 

 juvenescence. 



At early ephebic stage (diameters 14 by 

 15 mm), about 34 majors, minors absent 

 except for few septal spines; longest (car- 

 dinal) septa about 5.5 mm, tending to join 

 tips in groups ; cardinal septa somewhat pin- 

 nate^ counters nearly parallel with counter 

 septum; tabulae border median plate con- 

 nected to it at counter end; median plate 

 axial, about 3.7 mm long, not connected 

 with septa; dissepiments few, mostly near 

 cardinal fossula in about 3 ranges. 



In late neanic stage (diameters 13.1 by 

 13.3 mm) most major septa join thick 

 median plate ; short secondary septa present ; 

 dissepiments sparse; tabular intersections 

 frequent; median plate connected most 

 strongly to counter septum. 



In middle neanic stage (diameters 7.3 by 

 about 7.0 mm) 26 major septa, mostly 

 joined to thick median plate; secondary 

 septa rudimentary ; dissepiments very sparse. 



Longitudinal section. — Dissepimentarium 

 narrow, dissepiments nearly vertical, very 

 elongate; tabulae swin^ distally with in- 

 creasing rapidity tovs|jffd a^> joined at 

 median plate; small djtrellaef^^al a^reatest 

 curvature of tabul^; tabnlar de^ty about 

 15 in 1 cm. •^ C\^ ^ 



Occurrence. — Localjkies 2A, 25, 63, 80, 



^^- . . "^ / . 



Material. — Specimen's studied, 3. The 

 holotype may be in the Missouri Geological 



