MENISCOPHYLLUM 



45 



ulae few or numerous, partitioning the 

 whole of the corallum ; dissepiments few, 

 and not arranged in definite zones. No colu- 

 mella or central columelloid structure re- 

 sulting from fusion of septa." (Grove, 1935, 

 pp. 358, 359). 



Genotype. — Neozaphrentis tenella (Mil- 

 ler), 1891. 



Occurrence. — Silurian to Carboniferous 

 in many parts of the world. 



Neozaphrentis tenella (Miller) 

 emend. Easton 



Plate 4, figures 1-3 ; plate 16, figures 26-30 



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

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

 p. 11, pi. 1, figs. 17, 18, Adv. Sheets. 



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

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

 p. 621, pi. 1, figs. 17, 18. 



Zaphrentis tenella, Moore, 1927, Amer. Assoc. 

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



Zaphrentis tenella, Moore, 1928, Missouri Bur. 

 Geol. Mines, sen 2, vol. 21, pp. 63, 67, 93, 

 97, ?128, 154, 158, 195. 



Neozaphrentis tenella, Grove, 1935, Am. Mid- 

 land Naturalist, vol. 16, pp. 360-361, pi. 

 9, figs. 6-8, pi. 13, figs. 7-14. 



Externals. — Small, curved conical, with 

 apical end commonly bent to left when cardi- 

 nal fossula is orientated downward ; epitheca 

 with bourrelets, faint interseptal ridges, sep- 

 tal grooves ; calyx moderately deep, with 

 cardinal fossula irregularly located though 

 generally on convex half ; holotype with 27 

 septa, pinnate in cardinal quadrants, radial 

 in counter quadrants; alar pseudo-fossulae 

 present ; cardinal septum short, on right side 

 of long deep fossula; septal grouping quad- 

 ripartite ; counter septum long, neighboring 

 septa tend to be pinnate ; dissepiments not 

 observed ; tabulae widely spaced, sloping 

 toward cardinal quadrants. In a paratype, 

 major septa number 25 alternating with 

 secondary septa as septal ridges ; counter sep- 

 tum extends farthest distally in calyx. An- 

 other paratype has 26 major septa; counter 

 septum long, thick, with pronounced distal 

 boss on axial end ; neighboring septa of coun- 

 ter quadrants pinnate. In early ephebic stage 

 of broken paratype, tabulae reflexed into 

 cardinal fossula. 



Transverse sections. — Septa radially ar- 

 ranged in neanic stage, with axial edges 

 fused around central space ; in later stages 

 cardinal fossula merges with central space ; 



cardinal septum becomes recessive by ephebic 

 stage. 



Occurrence. — The types came from lo- 

 cality 9 ; specimens reported from localities 

 38, 48, 50, 51, 52, 55, 56, 58. Keyes (1894, 

 p. Ill) cites the locality as "Kinderhook 

 limestone: Sedalia, Louisiana," Missouri, 

 but the explanation to plate XIII reads 

 "Keokuk limestone." According to Mc- 

 Queen,^ there are no specimens of this spe- 

 cies preserved in the Missouri Geological 

 Survey collections. 



Material. — Specimens studied, 47. Holo- 

 type, University of Cincinnati No. 3360; 

 figured paratypes, University of Cincinnati 

 No. 3360a; unfigured paratypes. University 

 of Cincinnati No. 24397 ; plesiotypes. Uni- 

 versity of Cincinnati Nos. 24392, 24405 (as 

 paratype of A. corniculum Miller) ; Grove's 

 hypotypes. University of Chicago No. 

 31593; other specimens. University of Mis- 

 souri No. 2236. 



Remarks. — The writer has not included 

 Zaphrentis tenella^ Keyes, 1894, p. Ill, pi. 

 13, fig. 10 in the synonymy because the de- 

 scription is inadequate and the figure is not 

 similar to any of the type specimens. Among 

 the paratypes are two specimens of Meni- 

 scophyllum minutum, one specimen of Ho- 

 malophyllum calceolum, one specimen of 

 Rotiphyllum n. sp., one specimen of Am- 

 plexus corniculum, eight specimens of H. 

 (H.) pinnatus, and 20 specimens of Neo- 

 zaphrentis tenella. Twenty poor speci- 

 mens were not identified. 



Miller did not publish designations of 

 types for this species, but his figured speci- 

 men is listed as the holotype in his collection 

 and other specimens are listed as paratypes. 

 The writer accepts this as designation of 

 types in this instance. 



Genus MENISCOPHYLLUM Simpson, 1900, 

 emend. Easton 



MeniscopJiyllum Simpson, 1900, New York State 



Mus. Bull. 39, vol. 8, p. 199. 

 fHeptaphyllnm Clark, 1924, Geol. Mag., vol. 61, 



p. 416. 

 Non Meniscophyllum Grabau, 1928, Palaeontolo- 



gia Sinica, ser. B, vol. 2, fasc. 2, p. 138. 



Emended diagnosis. — Simple rugose cor- 

 als, small, curved, conical, without spines ; 

 cardinal fossula fairly prominent, situated 

 on convex side ; counter fossula large, con- 



McQueen, H. S., correspondence, August 26, 1942. 



