HAPSIPHYLLUM 



43 



Homalophyllites is a felicitous choice for 

 the subgenus to which the writer considers 

 these corals to belong. 



Hapsiphyllum (Homalophyllites) 

 CALCEOLUS (White and Whitfield) 



Plate 4, figures 4-7; Plate 16, figures 23-25 



Lophophyllum calceola White and Whitfield, 

 1862, Boston Soc. Nat. History Proc, vol. 

 8, p. 305. 



Zaphrentis calceola, White, 1880, U. S. Geol. and 

 Geog. Survey Terr., 12th Ann. Rept., pt. 1, 

 Contr. Invertebrate Paleontology no. 8, p. 

 156, pi. 39, figs. 6a-d ; advance printing. 



Zaphrentis calceola, White, 1883, U. S. Geol. and 

 Geog. Survey Terr., 12th Ann. Rept., pt. 1, 

 Contr. Invertebrate Paleontology, no. 8, p. 

 156, pi. 39, figs. 6a-d. 



Zaphrentis calceola, Rov^ley, 1889, Am. Geologist, 



vol. 3, p. 275. 

 Amplexus corniculum Miller, 1891, [in part], 



Indiana Dept. Geol. Nat. Res. I7th Ann. 



Rept., p. 9. Adv. Sheets. 



Amplexus corniculum. Miller, 1892, [in part], 

 Indiana Dept. Geol. Nat. Res. 17th Ann. 

 Rept., p. 619. 



Zaphrentis calceola, Keyes, 1894, Missouri Geol. 

 Survey, vol. 4, p. 110. 



Zaphrentis calceola, Keyes and Rowley, 1897, 

 Proc. Iowa Acad. Sci., vol. 4, p. 30. 



Zaphrentis calceola, Van Tuyl, 1925, Iowa Geol. 

 Survey, vol. 30, pp. 104, 122, 123. 



Zaphrentis calceola, Moore, 1927, Am. Assoc. 

 Petrol. Geol. Bull. vol. 11, no. 2, p. 1329. 



Homalophyllum calceolum, Moore, 1928. Missouri 

 Bur. Geol. Mines, ser. 2, vol. 21, pp. 63, 

 128, 154, ?183, 185, 186, 191, 195, ?233, 224, 

 248. 



Zaphrentis calceola, Moore, 1928, Missouri iBur. 

 Geol. Mines, ser. 2, vol. 21, p. 195. 



Zaphrentis calceola, Laudon, 1931, Iowa Geol. 

 Survey, vol. 35, p. 393. 



Zaphrentis cliffordana, Laudon, 1931, Iowa Geol. 

 Survey, vol. 35, pp. 427, 429 in part. 



?Homalophyllum calceolum, Cline, 1934, Am. 



Assoc. Petrol. Geol. Bull., vol. 18, no. 9, p. 



1144. 

 HomalopJiyllum calceolum, Grove, 1935, Am. 



Midland Naturalist, vol. 16, no. 3, p. 354; 



pi. 9, figs. 20-24; pi. 13, figs. 1-6. 



Homalophyllum calceolum, Hill, 1937, Royal Soc. 

 Queensland Proc, vol. 48, p. 25, text-fig. 

 5 on p. 24. 



Externals. — Small, curved, ceratoid, in- 

 creasingly flattened proximally on convex 

 side; epitheca moderately thick, with inter- 

 septal ridges, septal grooves, and very deep 

 angular encircling constrictions ; calyx mod- 

 erately deep, with pronounced axially en- 



larged cardinal fossula on convex side ; septa 

 distally produced around axial portion of 

 fossula, fused on axial ends, reinforced by 

 sclerenchyme ; cardinal septum very short; 

 minor septa present. 



Transverse sections. — In late ephebic 

 stage (diameters 7.9 by 7.2 mm) major 

 septa number 30; minor septa very scarce, 

 as septal ridges; tabulae sparse. 



In late neanic stage (diameters 3.4 by 

 2.0 mm) major septa number 21, with thin 

 majors inserted between most neighboring 

 thick septa ; cardinal septum long, bifurcate 

 at tip. 



In very early neanic stage (diameters 

 2.4 by 1.1 mm) thick major septa number 

 14; no thin majors present; cardinal and 

 counter septa confluent. 



Longitudinal section. — Tabulae thin, 

 broadly arched distally, about 10 in 5 mm. 



Occurrence. — Localities 1, 8, 16, 22, 30, 

 35, 38, 55, 57, 62, ?71, 72, 73, 75, ?76, 

 77-79, 84, 85. Grove lists only "Chouteau 

 limestone, Sedalia, Missouri," as the hori- 

 zon and range of this species, having ap- 

 parently been unable to verify its reported 

 occurrence at other places. White reported 

 it from the base of the Burlington and also 

 below the Burlington limestone at and near 

 Burlington, Iowa. Rowley reported the 

 species from the "upper Chouteau" (unre- 

 stricted), 4 miles east of Curryville, Mis- 

 souri ; lower Burlington at Louisiana, Mis- 

 souri; and upper Burlington 2 miles north 

 of Curryville, Missouri. Keyes listed the 

 species as occurring in the Kinderhook lime- 

 stone at Sedalia, Clarksville, Hannibal, and 

 Louisiana, all in Missouri. 



Material. — Specimens studied, 50. Two 

 cotypes (unavailable for study), American 

 Museum of Natural History No. 4993/1; 

 Grove's hypotype, University of Chicago 

 No. 31584a; White's pleisiotypes (un- 

 studied), United States National Museum 

 Nos. 9330, 9331 ; specimens figured herein. 

 University of Cincinnati No. 24311 and 

 University of Missouri not numbered ; other 

 material, American Museum of Natural 

 History Nos. 6365/2, 6365/3, University 

 of Missouri No. 1139 and not numbered, 

 University of Cincinnati No. 24396 (which 

 was a paratype of Neozaphrentis tenella), 

 Illinois State Geological Survey (Worthen 

 collection) No. 4302, and University of 

 Chicago No. 1282. 



