686 



BRACHIOPODA. 



[ath. cho. 



Acrotheli' dichotoma refer to Acrotreta di- 

 chotoma. 



Acrotreta (jtilielmi refer to Discinopsis guli- 

 elmi. 



Anoplia, Flail, 1892, Pal. N. Y., vol. 8, p. 309. 

 Proposed as a subgeneric name with 

 Leptaena (?) nucleolata, Hall, as the 

 type. It is only necessary to say it has 

 no place in nomenclature as a subge- 

 neric name. If it is a name which de- 

 serves retention, it should be in a ge- 

 neric sense, and probably it should be 

 placed in that rank. 



Athyris angelica var. occidentals, Whit- 

 eaves, 18»1, Cont. to Can. Pal., vol. 1, 

 p. 227, Devonian, 

 ashlandensis, Herrick, 1888, Bull. Denison 



Univ. vol. 4, p. 24, Waverly (!r. 

 brittsi, and A. ottervillensis, S. A. Miller, 

 1802, 18th Rep. Geo. Sur. Ind., p. 60, 

 Ham. Gr. 



Atrypa ealvini, and A. reticularis, var. ni- 

 agarensis, Nettleroth, 188!», Kentucky 

 Foss. Shells, pp. 85), 92, Niagara Gr. 

 defltcta, Hall, sec Zygoepira deflect*. 

 ellipsoidea, Nettleroth, 1889 Kentucky 



Foss. Shells, p. 90. Up. Held Gr. 

 missouriensis, S. A. Miller, 1892, Advance 

 Sheets lSth Rep. Geo. Bar. Ind., p. til, 

 Ham Gr. 



Aulostegex tpondyU f o rm i *, see Strophalosia 

 spondyliformis. 



Barroisella, Hall, 1892, Pal. N. Y., vol. 8, 

 j». 62. [Kty. j. roper name.] Lingula- 

 like shell ; pedicel-valve bears a high 

 Cardinal area, appearing as a thickened 

 triangular plate, divided by a broad 



; pedicel-groove, and having at each 

 basal angle a boss or condyle which 

 served as a muscular fulcra or as a point 

 of articulation ; the interior has a sub- 

 quadrate depressed area in continuation 

 of the pedicel-groove, and from its ante- 

 lateral angles diverge two linear depres- 

 sions, which extend about one-fourth 

 the length of the shell; from outside 

 and behind the extremities of these de- 

 pressions begins a pair of long, curved 

 furrows, composed of two shorter 

 curves, the posterior rounding over the 

 extremities of the linear depressions; 



; the anterior and longer curves gradually 

 approximate, and nearly meet at about 

 one-third the length of the shell from 

 the anterior margin ; these furrows are 

 accompanied by low ridges along their 

 inner margin. A low median ridge, 

 with elevated edges, begins at the pos- 

 terior umbonal impression, and con- 

 tinues to the center of the valve, widen- 



1 ing near its anterior extremity ; behind 

 its termination there is a pair of indis- 

 tinct muscular impressions. In the 

 brachial valve the beak is scarcely 

 prominent, and the muscular markings 

 are essentially as in the opposite valve, 

 but more sharply developed ; beneath 

 the beak there is a faint umbonal scar. 

 The long compound lateral curves have 



a ^renter degree of curvature than in 

 the pedicel-valve, and their posterior 

 portion incloses a thickened area, which 

 is continued into a low median .septum 

 that bifurcates in the middle of the 

 valve, and has extending from the 

 angle an intercalated ridge. Type Lin- 

 gnla subxpatulata. Meek & Worthen. 



Billinosella, Hall, 1892, Pal. N. Y., vol. 8, 

 p. 230. [Kty. proper name.] Shell 

 Orthis-like, transverse; suhquadrate or 

 semicircular in outline ; contour con- 

 cavo or planoconvex; surface striate; 

 pedicel-valve the more convex; cardinal 

 area moderately high, vertical or 

 slightly incurved ; delthyrium covered 

 by a convex plate, which may be mi- 

 nutely perforated at the apex; teeth 

 well developed, but dental plates are 

 continued along the bottom of the um- 

 bonal cavity, inclosing a small subellip- 

 1 ic nl muscular area near the apex. In 

 the brachial valve the cardinal area is 

 greatly inclined, making an obtuse 

 angle with that of the opposite valve; 

 dclthvrium partly covered by a convex 

 deltidium, which never attains the 

 development seen in the opposite valve, 

 and is sometimes absent. Type Ortkit 

 pe/.ina, Hall. It probably includes 

 Streptorhynchui /irimordiale, Whitfield, 

 Ortkidna arandxva and Orthis lau- 

 rentina, Billings. 



Cam arei.la bernensis, and C. owatonnensis, 

 Sardeson, 1892, Bull. Minn. Acad. Nat. 

 Bel., vol. 3, p. 328, Trenton Gr. 

 minor, Walcott, 1890, 10th Ann. Rep. 

 U. S. Geo. Sur. p. 014. Up. Taconic. 



Ciionetes manitobensis, Whiteaves, 18'H', 

 Cont. to Can. Pal., p. 281, Devonian, 

 subquadrata, Nettleroth, 1889, Kentucky 



Fose. Shells, p. 67, Up. Held. Gr. 

 tumida, Herrick, 1888, Bull. Denison 



Univ., vol. 3, ]>. :5<i, Waverly <!r. 

 complanata, dawsoni, reversa, refer to Cho- 

 nostrophia. 



CiiONoi'Ecrutf, Hall, 1892, Pal. N. Y., vol. 8, 

 p. 312. [Ety. chonos, a cup; pehios, 

 combed.] Shell like Chonetes, the car- 

 dinal margin of the pedicle-valve bear- 

 ing a row of erect spines; beak com- 

 pressed, leaving a flattened area or 

 cicatrix from attachment in early 

 growth ; surface ornamented with a 

 double series of concentric lines or 

 wrinkles, having the appearance of the 

 engraving on a machine-turned watch- 

 case, and strongest on the umbonal and 

 central part ; these wrinkles are crossed 

 by concentric growth lines, and some- 

 times by finer radiating lines more or 

 less flexuou8. Casts of the pedicel- 

 valve show the impression of a short 

 median septum dividing two broad 

 obcordate flabelliform muscular scars, 

 from the outer margin of wdiich there 

 are radiating vascular scars ; impres- 

 sions of a narrow cardinal area and 

 exceedingly small teeth also occur on 



