108 HYDROZOIDS AND CORALS. 



Amplexus yandelli? Edwards & Haime. 



Plate xiii, flg. 2. 

 Amplexus yandelli Edwards & Haime, 1851: Monog. Polyp. Foss. d. 



Terr. Pal., p. 344. 

 Amplexus yandelli Rominger, 1876: Geol. Sn.r. Michigan, vol. Ill, pt. ii, 



p. 155, pi. liv, flg. 2. 



Oonico-cjlindrical, flexuose stems, from two to four centi- 

 meters in diameter, annulated by fine wrinkles of growth, with 

 intermediate coarser rugse, and frequently of a jointed struc- 

 ture through periodical constrictions of the calyces and the 

 continued growth of the stem without interruption of the con- 

 tinuity of the epithecal wall. Calyces deep, with erect margins, 

 surrounded by about sixty alternately large and small vertical 

 crests. The bottom of the calyces is formed by flat or warped 

 diaphragms, depressed on one side by deep septal fovea. The 

 lamellae are restricted to the outer circumference of the 

 diaphragms, but sometimes they extend to the center as super- 

 ficial ridges. (Eominger.) 



Horizon and localities. — Lower Carboniferous, Kinderhook 

 limestone ( Chouteau) : Carry villa ( Pike county ). 



Certain Carboniferous corals from Curryville correspond so 

 perfectly to authentic examples of A. yandelli that it is almost 

 impossible to refer them to any other species. They answer 

 so well to Rominger's description of Edwards & Haime's species 

 that it is repeated here. 



Amplexus blairi Miller. 

 Plate xiii, flg. 1. 

 Amplexus blairi MXWex ^ \SQl : Geol. Sur. Indiana, 16th Ann. Kept. , Ad. 

 Sheets, p. 8 , pi. i, fig. 7. 



Similar to A. fragilis, but much smaller, more slender, 

 somewhat tortuose, with the diaphragms proportionally much 

 farther apart and the lamellae much more prominent. 



Horizon and loealities. — Lower Carboniferous, Burlington 

 limestone : Springfield, Sedalia, Louisiana ; Burlington ( Iowa ) ; 

 Kinderhook limestone: Sedalia. 



Although Miller's type specimen is very imperfect, and the 

 figures show not even the generic characters, there would be 



