KINK AID CORALS FROM ILLINOIS 



387 



the counter septum is markedly rhopaloid 

 and rudimentary minor septa appear. Axial 

 fusion tends to be dissipated in very late 

 ephebic stage (fig. 4b), the majors are sinu- 

 ous and axilly swollen, and minor septa are 

 pronounced. 



Occurrence. — Specimens were collected by 

 the writer from bed 13 of the measured sec- 

 tion at the Illinois locality. One specimen, 

 collected by G. A. Cooper from the base of 

 the (upper part of the) Pitkin formation, 3 

 miles east of Elkins, Arkansas, was lent for 

 study. 



Material. — The following specimens are in 

 the collections of the Illinois State Geologi- 

 cal Survey: holotype no. 3512; figured para- 

 types no. 3513; unfigured paratypes no. 

 3514. Figured plesiotype: U. S. National 

 Museum. 



Family Hapsiphyllidae Grabau emend. 



Easton, 1944 

 Genus Triplophyllites Easton, 1944 



Remarks. — Triplophyllites was proposed 

 for specimens generally identified as "Trip- 

 lophyllum" in the United States. For a 

 complete diagnosis of the genus and a dis- 

 cussion of its relationships, see Easton 1944, 

 pp. 35-42. 



Triplophyllites palmatus Easton 



Triplophyllites palmatus Easton, 1944, Illinois 

 Geol. Survey, Rept. Inv. 97, p. 35, pi. 8, figs. 

 1-6. 



Remarks. — This species has been differen- 

 tiated on the following characters (Easton, 

 1944, p. 36). 



"T. palmatus differs from T. spinulosusa 

 (Grove) in having the cardinal septum short- 



ened by early ephebic stage; by its pro- 

 nouncedly palmate grouping of septa in the 

 counter quadrants, its very strong counter 

 septum, and by the early reduction in the 

 length of the cardinal septum. The generally 

 trochoid shape, the very deep calyx, the 

 strong interseptal ridges, and the sparse 

 spines furnish external identifying charac- 

 ters." 



This species has been figured recently in 

 detail (Easton, 1944, pi. 8). 



Family Caniniidae 

 Genus Caninostrotion Easton, 1943 

 Diagnosis. — (Easton, 1943, p. 134) 



Compound rugose corals multiplying asexually 

 chiefly by "peripheral increase" but possibly also 

 by basal division. Cardinal fossula conspicuous in 

 all but early stages, formed by down-bending of 

 tabulae and shortening of cardinal septum. Dis- 

 sepimentarium broad; dissepiments tend toward 

 anguloconcentric pattern. Pseudocolumella inter- 

 mittently developed, variable, formed by junc- 

 tion of axial ends of some major septa combined 

 with distal arching of tabulae. Tabulae strong, 

 irregularly arranged. Typically, septa are equally 

 thickened in all quadrants. 



Caninostrotion variabilis Easton 

 Figures 8a, 8b 



Caninostrotion variabilis Easton, 1943, Jour. 

 Paleontology, vol. 17, no. 2, p. 134, pi. 21, figs. 

 14-16. 



Externals. — Conical proximally, cylindri- 

 cal distally; calyx deep, with septal traces on 

 floor, steep-walled near floor, oblique near 

 periphery; epitheca thin. 



Transverse section. — In late ephebic stage 

 (diameters 21 by 23 mm.) dissepimentarium 

 extends half of radius, consists of irregular 

 anguloconcentric, concentric and herring 



Explanation of Figures 1-7 

 Kinkaidia trigonolis, n. gen. and n. sp.; X5; (p. 385) 



la-lg — Successive, reversed, serial transverse sections from aseptate earliest brephic stage 



through early neanic stage. 

 2a — Transverse section in open calyx ; 2b, reversed transverse section near close of brephic stage. 



3 — Reversed transverse section in late ephebic stage with rudimentary minor septa. 



4a — Reversed transverse in early ephebic stage; 4b, transverse section in very late ephebic stage 

 showing short secondaries and very long counter-laterals. 



5 — Transverse section in late ephebic stage; U. S. National Museum specimen from Pitkin for- 

 mation. 



tf-— Reversed transverse section in middle ephebic stage; holotype; Illinois Geological Survey 

 No. 3512. 



7 — Longitudinal section. 

 All figures except 5 and 6 are of plesiotypes; Illinois Geological Survey No. 3513. 



