I,IN. — NEW.] 



BRACHIOPODA. 



689 



elliptical ; hinge-line straight ; pedicel- 

 valve evenly convex ; cardinal area 

 moderately high, delthyrium nearly 

 covered by a convex plate; teeth incon- 

 spicuous; brachial valve slightly con- 

 cave; cardinal area high, delthyrium 

 filled with the cardinal process which 

 is divided behind by a median groove ; 

 on the cardinal margin this process is 

 double but less conspicuous than the 

 crural plates, which are arched and 

 highly elevated above the hinge-line ; 

 they are short, terminate abruptly, and 

 inclose deep sockets ; visceral area flat- 

 tened or concave; its anterior margin 

 forming a double visceral area is di- 

 vided by a broad median ridge, and its 

 surface covered with five sharp radi- 

 ating lines, which end at the line of de- 

 flection. Type Leptsena sordida, Billings. 

 Lindstromella, Hall, 1892, Pal. N. Y., vol. 

 8, p. 134. [Ety. proper name.] Shells 

 with outline contour and pedicel 

 characters as in Orbiculoidea ; brachial 

 valve with a faint median septum and 

 two strong approximating ridges, begin- 

 ning behind a transverse line passing 

 through the apex, and rapidly converg- 

 ing to meet the median septum; ante- 

 rior adductor scars lying between these 

 ridges and the median septum ; a cir- 

 cular scar at the posterior extremity of 

 each ridge. Type L. aspidium, p. 178, 

 Ham. Gr. 

 Lingula atra, Herrick, 1888, Bull. Denison 

 Univ., vol. 4, p. 16, Waverlv Gr. 



deflecta, Winchell & Schuchert, 1892, Am. 

 'Geo., vol. 9, p. 284, Galena Gr. Not de- 

 fined so as to be recognized. 



exili*, sfe Lingulodiscina exilis. 



gannensis, Herrick, 1888, Bull. Denison 

 Univ., vol. 4, p. 17, Waverly Gr. 



gorbyi, S. A. Miller, 1892, Advance Sheets 

 18th Rep. Geo. Sur. Ind., p. 55, Chou- 

 teau limestone. 



macconnelli, Walcott, 1888, Proc. U. S. Nat. 

 Mus., p. 441, Up. Taconic. Not properly 

 defined. 



meeki, Herrick, 1888, Bull. Denison Univ., 

 vol. 4, p. 18, Waverly Gr. 



norwoodi, see Lingulops norwoodi. 



parrishi, S. • A. Miller, 1892, Advance 

 Sheets 18th Rep. Geo. Sur. Ind., p. 53, 

 Up. Coal Meas. 



riciniformis var. galenemis, Winchell & 

 Schuchert, 1892, Am. Geo., vol. 9, p. 284, 

 Galena Gr. Not defined so as to be 

 recognized. 



sedaliensis, S. A. Miller, 1892, Advance 

 Sheets 18th Rep. Geo. Sur. Ind., p. 54, 

 Chouteau limestone. 



subspatulata, refer to Barroisella subspatu- 

 lata. 



tighti, Herrick, 1887, Bull. Denison Univ., 

 vol. 2, p. 43, Coal Meas. 



triangulata, Nettleroth, 1889, Ky. Foss. 

 Shells, p. 34, Up. Held. Gr. 



waverlyensis, Herrick, 1888, Bull. Denison, 

 Univ., vol. 4, p. 18, Waverly Gr. 



Lingulelasma galenensis, Winchell & 

 Schuchert, 1892, Am. Geo., vol. 9, 

 p. 285, Galena Gr. Not defined so as 

 to be recognized. Ulrich, Schuchert 

 and others persist in using the word 

 Lingulasma, which has no more mean- 

 ing than Lasma or Linguma would 

 have. I spelled the word Lingulelasma, 

 as it should have been coined, suppos- 

 ing the misspelling was accidental ; but, 

 probably, Mr. Ulrich's spelling should 

 be recognized, and if so, then the word 

 should be stricken from science, as a 

 meaningless compound, under rules on 

 page 98. 



Lingulodiscina, Whitfield, 1890, Bull. Am. 

 Mus. Nat. Hist., p. 121. [Ety. Lingula 

 and Distinct,.] Upper valve linguloid in 

 character, having a terminal beak, the 

 accretions of growth being along the 

 lateral and basal margins ; lower valve 

 having its growth-lines nearly equal on 

 all sides of the initial point and perfo-. 

 rated on the cardinal side by a byssal 

 slit as in Discina ; shell structure as in 

 Lingula and Discina. Type L. exilis. 

 exilis, Hall, 1860, (Lingula exilis,) 13th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 77, 

 and Pal. N. Y., vol. 4, p. 7, Ham. Gr. 



Lingulops granti, Hall, 1892, Pal. N. Y., 

 vol. 8, p. 173, Niagara Gr. 

 norwoodi, instead of Lingula norwoodi. 



Mimulus, Barrande, 1879, Systeme Silurien 

 du Centre de la Boheme, voi. 5, p. 109. 

 [Ety. mimulus, a mime, an imitator.] 

 Spirifera (?) waldr men&is, Miller & 

 Dyer, was referred to Triplesia by Hall, 

 without a knowledge of the interior, and 

 he now refers it to Mimulus, though the 

 internal characters of that genus are un- 

 known. 



Monomerella egani, M. greenii, M. kingi, 

 M. ortoni, Hall, 1892, Pal. N. Y., vol. 8, 

 pp. 174, 175, Niagara Gr. 



Newberria, Whiteaves, 1891, Cont. to Can. 

 Pal., vol. 1, p. 236. [Ety. proper name.] 

 Shells elongate-ovoid, having the gen- 

 eral contour and external aspect of 

 Rensselseria and Amphigenia, but with- 

 out the strongly radiate striate surface 

 of the former genus. The convexity of 

 the valves is greatest in the umbcnal 

 region, and the surface is distinctly 

 flattened over the lateral slopes, leaving 

 the median portion of the valves very 

 prominent ; the pedicel valve has the 

 rostrum produced and incurved ; the 

 apex truncated by a circular foramen ; 

 deltidial plates not determined ; the 

 teeth are comparatively small, project- 

 ing forward and gently upward, free at 

 their extremities, and supported by nar- 

 row dental plates which join the inte- 

 rior of the valve above the middle of 

 its depth, and are continued forward as 

 slender ridges upon the inner surface, 

 which gradually merge into the shell. In 

 the bottom of the rostral and umbonal 

 cavity there is a broad, scarcely defined, 



