CANINIA 



49 



minors indicated at only one or two places. 

 Septa in cardinal quadrants slightly thicker 

 than in counter quadrants. 



At diameter of 12 mm in same specimen 

 (early ephebic stage), 30 major septa, those 

 in cardinal quadrants thickened ; those in 

 counter quadrants long, thin, bending to- 

 ward counter septum, tips partly fused ; 

 cardinal septum shortest. 



Still earlier (late neanic) stage of same 

 specimen (diameters 6.1 by 8.7mm), 25 

 majors, eleven cardinals quite thick, fused 

 at tips; cardinal septum thickest, two or 

 three septa near it fuse to first lateral sep- 

 tum; counters unfused, counter septum 

 slightly longer than others. 



In earlier neanic stage (diameters 4.1 by 

 5.3 mm), 14 septa, all thick; tabulae 

 present. 



Longitudinal sections.— Tahulsie in cyl- 

 indrical specimen mentioned above 6 or 7 

 mm distant, generally flat with sharply 

 depressed borders, very slightly concave 

 centrally. 



Tabulae 1.5 to 6 mm distant in another 

 specimen, sloping irregularly because of two 

 geniculations in only 2 or 3 cm. 



Occurrence. — Localities 12, 23. 



Material. — Specimens studied, 9. Holo- 

 type. University of Chicago No. 6338 ; 

 studied topotypes. University of Michigan 

 Nos. 23133, 23233, 23234, 23235, 23236; 

 other specimen, Illinois State Geological 

 Survey No. 3498 ; possible representative, 

 University of Missouri not numbered. 



Remarks. — This species, although very 

 closely related to A. corniculum, can be dis- 

 tinguished by its very much larger size, 

 nearly flat tabulae, and the absence of 

 prominent swellings at geniculations. It 

 might have developed from A. corniculum 

 which is similar in having a long counter 

 septum, the ends of some counter septa fused 

 in late stages, and a noticeable cardinal fos- 

 sula. 



Amplexusyandellif (Keyes, 1894, p. 108, 

 pi. 13, fig. 2) may be A. rockfordensis, but 

 this cannot be checked. 



Family Caniniidae 

 Genus Caninia Michelin in Gervais, 1840 



"Corallum simple, turbinate and conical, often 

 slender and cylindrical for a great part of its 

 length. 



"Major septa well developed and meeting in 

 the center in the lower conical part of the coral, 

 but in the cylindrical portions usually becoming 

 amplexoid in character. 



"Minor septa of various lengths in different 

 species. 



"Cardinal fossida variable in extent, character- 

 istically limited by tabulae only, at the inner end, 

 and with the flanking septa loose or disconnected. 



"Tabulae well developed, but variable in regu- 

 larity; they may be highly arched and vesicular. 

 A marginal ring of more or less vertical dissepi- 

 ments, usually thin and delicate, intervenes in 

 the mature stages of growth between the tabulae 

 and the wall." (Carruthers, 1908, p. 158.) 



Genotype. — Caninia cornucopiae Michelin 

 in Gervais, 1840. 



Occurrence. — Widespread in the Carbon- 

 iferous. 



Remarks. — The taxonomic status of 

 American corals referable to Caninia has 

 been discussed in detail by the writer 

 (Easton, 1944). 



Caninia CORNICULUM (Miller) emend. 

 Easton 



Plate 12, figures 1-3; Plate 16, figures 40-42 



Amplexus corniculum Miller, 1891, Indiana Dept. 



Geol. Nat. Res. 17th Ann. Rept., p. 9, pi. 



1, figs. 21, 22. Adv. Sheets. 

 Amplexus hlairi Miller, 1891, idem, p. 8, pi. 1, 



fig. 7. 

 Amplexus corniculum, Miller, 1892, Indiana Dept. 



Geol. Nat. Res. 17th Ann. Rept., p. 619, pi. 



1, figs. 21, 22. 



Amplexus blairi, Miller, 1892, idem, p. 618, pi, 



1, fig. 7. _ 

 ? Amplexus hlairi, Keyes, 1894, Missouri Geol. 



Survey, vol. 4, p. 108. 



Amplexus hlairi, Keyes and Rowley, 1897, Proc. 

 Iowa Acad. Sci. vol. 4, p. 29. 



Amplexus hlairi, Moore, 1928, Missouri Bur. Geol. 

 Mines, ser. 2, vol. 21, pp. ?67, 93, 96, 97, 

 ?158, 164, ?177. 



^Amplexus sp. cf. A. hlairi, Moore, 1928, Mis- 

 souri Bur. Geol. Mines, ser. 2, vol. 21, p. 223. 



Amplexus corniculus, Moore, 1928, Missouri Bur. 

 Geol. Mines, ser. 2, vol. 21, pp. ?67, ?93, 97. 



Externals. — Curved ceratoid to cylindri- 

 cal, generally with irregularly recurring 

 swollen regions ; commonly geniculate at 

 swollen region ; epitheca with concentric 

 striae and stronger wrinkles, without inter- 

 septal ridges; calyx deep in holotype, 26 

 major septa extending about 2/3 of radius; 

 cardinal septum very short, located in very 

 deep fossula; counter septum slightly longer 

 than neighboring majors; alar septa inter- 

 mediate in length ; minor septa rudimentary, 



