METRIOPHYLLUM 



31 



calyces. No traces of fossulae were ob- 

 served. The "fossula" as described by Car- 

 ruthers (1913) refers to a different septal 

 distribution and not a depression at the 

 cardinal position (see Carruthers, 1913, pi. 

 Ill, figs. 4, 7, 9, 10). 



Altogether, 22 of the original cotypes are 

 referable to this species, one to Syringo- 

 pora harveyij one to Paleacis n. sp., one pos- 

 sibly to Hapsiphyllum n. sp., one to Am- 

 plexus corniculum Miller, three to Metrio- 

 phyllum n. sp., and two are unidentifiable 

 (one may be a pathologic specimen of C. 

 tan til la). 



Family Metriophyllidae Hill, 1939 



Genus Metriophyllum Milne-Edwards 

 and Haime, 1850 



Metriophyllum Milne-Edwards and Haime, 1850, 



Paleont. Soc. London, p. Ixix. 

 Metriophyllum Milne-Edwards and Haime, 1851, 



Polypes Foss. des Terr. Palaeoz., p. 317. 

 Lopholasma Simpson, 1900, New York State Mus. 



Bull. 39, vol. 8, p. 206. 



Stereolasma Simpson, 1900, New York State Mus. 

 Bull. 39, vol. 8, p. 205. 



Lopholasma Grabau, 1922, Paleontologia Sinica, 

 ser. B, vol. 2, fasc. 1, p. 42. 



Lophelasma Lang, Smith, and Thomas, 1940, In- 

 dex of Palaeozoic Coral Genera, p. 80. 



Stereoelasma Lang, Smith, and Thomas, 1940, 

 idem, p. 123. 



Small, simple, ceratoid rugose corals; 

 septa carinate, radially arranged, commonly 

 fused axially to form a pseudocolumella ; 

 tabulae thin, sparse ; dissepiments present. 



Genotype. — Metriophyllum bouchardi 

 Milne-Edwards and Haime. 



Occurrence. — Hamilton (Devonian) of 

 New York; probably late Visean or early 

 Moscovian of China; Lower Carboniferous 

 of the British Isles ; lower part of Chouteau 

 limestone (unrestricted) of Missouri. 



Material. — The specimens illustrated by 

 Hall (1876, pi. 19, figs. 1-13) are mostly 

 in the American Museum of Natural His- 

 tory, except for the original of figure 9, 

 which is New York State Museum No. 

 3740/1. The location of Hall's specimens 

 illustrated as figures 4, 6, 10 is unknown. 

 Simpson's (1900) specimens are in the New 

 York State Museum as follows: fig. 16, 

 No. 3740/3; fig. 17, No. 3740/2; fig. 18, 

 No. 3741/2; fig. 19, No. 3520/1; fig. 20, 

 No. 3520/2; fig. 22, No. 3520/3. 



Remarks.— Hill (1940, pp. 132, 136) in- 

 dicated that Metriophyllum is a senior syn- 

 onym of Lopholasma, but she does not use 

 either name, preferring to retain species 

 groups of "Zaphrentis'' because the other 

 pertinent genera have not been studied in 

 detail. The writer feels that obvious dif- 

 ferences between Zaphrentis and Metrio- 

 phyllum warrant using the latter genus 

 when it seems applicable, even though its 

 details are imperfectly known. 



Grabau (1922, p. 42) believed that "the 

 Devonian form is probably derived from 

 Stereolasma rectum'' and that (p. 58) 

 Lophocarinophyllum was probably derived 

 from a coral of the Metriophyllum type. 

 Jeffords reiterated the same view (1942, 

 pp. 208-209). Hill (1940, p. 132) be- 

 lieved Fasciculophyllum was derived from 

 corals of the Metriophyllum type which she 

 includes in the Zaphrentis omaliusi group. 

 Lang, Smith, and Thomas (1940, p. 123) 

 state that Stereolasma and Lopholasma are 

 junior synonyms of Metriophyllum; on the 

 basis of examination of the figures the writer 

 concurs. It has proved impossible to decide 

 to which genera belong any of Hall's 

 specimens referred to by Simpson. Simp- 

 son's types are thin-sections and are not 

 known to have been cut from any of Hall's 

 figured specimens. 



Metriophyllum deminutivum 

 Easton, n. sp. 



Plate 3, figures 1-3 



Zaphrentis tantilla Miller, 1891, [in part], In- 

 diana Dept. Geol. Nat. Res. 17th Ann. Rept., 

 p. 11, Adv. Sheets. 



Zaphrentis tantilla, Miller, 1892, [in part], In- 

 diana Dept. Geol. Nat. Res., 17th Ann. Rept., 

 pp. 621, 622. 



Externals. — Small, slightly curved, cera- 

 toid to cylindrical, slightly elliptical in 

 cross-section ; epitheca thin, very finely stri- 

 ate, unevenly constricted, commonly obscur- 

 ing interseptal ridges; calyx deep, steep- 

 walled, without calicular boss but with 

 traces of septa on floor and walls. 



Dimensions of specimens, all incomplete : 



Greatest 

 Length diameter 



University of Cincinnati 



No. 24300 (holotype) . 10.5 mm 4.2 mm 



University of Cincinnati 



No. 24301 (paratype) 8.3mm 4.4mm 



University of Cincinnati 



No. 24302 (paratype) 10.1mm 5.5 mm 



