472 



LAMELLIBRANCHIA TA. 



[CLI. CON. 



FIG. 797. Clino- 

 pisthaantiqua. 



nuculiformis, Hall, 1860, Can. Nat. and 

 Geo., vol. 5, p. 150, Up. Sil. 



planulatus, Conrad, 1841, (Nuculites 

 planulatus,) Ann. Rep. N. Y., p. 48, 

 and Pal. N. Y., vol. 1, p. 300, Hud. 

 Riv. Gr. 



semiradiatus, Hall, 1860, Can. Nat. and 

 Geo., vol. 5, p. 150, Arisaig series of 

 Up. Sil. 



solenoides, see Solenopsis solenoides. 



subovatus, Hall, 1860, Can. Nat. and 

 Geo., vol. 5, p. 151, Arisaig series of 

 Up. Sil. 



CLINOPISTHA, Meek & Worthen, 1870, Proc. 

 Acad. Nat. Sci. Phil., p. 43. [Ety. klino, 

 I lean ; opisthe, backward.] Shell short, 

 gibbous, subquadrate, beaks posterior, 

 and muscular impressions immediately 

 behind the beaks; muscular impres- 

 sions near the margins 

 of the valves ; ligament 

 external. Type C. Isevis. 

 insularis, Walcott, 1885, 

 (Dystactella insularis,) 

 Monogr. U. S. Geo. Sur., 

 vol. 8, p. 172, Devonian, 

 antiqua, Meek, 1871, Proc. 

 Acad. Nat. Sci. Phil., p. 67, and Ohio 

 Pal., vol. 1, p. 208, Corniferous Gr. 



Isevis, Meek & Worthen, 1870, Proc. Acad. 

 Nat. Sci. Phil., p. 44, and Geo. Sur. 

 111., vol. 5, p. 584, Coal Meas. 



radiata, Hall, 1858, 

 (Edmondia radiata,) 

 Geo. Rep. Iowa, p. 

 716, Coal Meas. 



subnasuta, Hall &Whit- 

 field, 1872, (Tellino- 

 my a subnasuta,) 24th "^f^^T 

 Rep. N Y Mus ' 798 - oiinopis- 

 Nat.' Hist., p. ^192^ 

 and Pal. N. Y., vol. 5, p. 512, 

 Ham. Gr. 



telliniformis, Hall, 1883, (Dystactella tel- 

 liniformis,) Pal. N. Y., vol. 5, p. 513, Up. 

 Held. Gr. 



CONOCAKDIUM, Bronn, 1835, Leth. Geo., 

 vol. 1, p. 92. [Ety. konos, a cone; 

 kardia, the heart.] Equivalve, very 

 inequilateral, hemifusiform ; beaks 

 prominent, incurved close to the an- 

 terior end, which is broad, flattened, 

 more or less truncate nearly at right 

 angles to the straight hinge-line, which 

 is prolonged as an abruptly contracted, 

 slender, tubular wing from the dorsal 

 part of the anterior face ; body of the 

 shell diminishing conoidally from the 

 edge of the anterior face toward the 

 posterior end, which is attenuated, 

 roundly and widely gaping ; substance 

 of the shell very thick;, of a minute 

 quadrangular cellular tissue, with 

 strong internal ribs radiating from the 

 beak, and often smaller external ones, 

 strongest anteriorly. Type C. hiber- 

 nicum. 



acadianum, Hartt, 1868, Acad. Geol., p. 

 304, Carb. 



sequilaterale, Hall, 1858, Trans. Alb. Inst., 



vol. 4, p. 16, and Bull. Am. Mns. Nat. 



Hist., p. 62, Warsaw Gr. 

 altum, Keyes, 1888, Proc. Acad. Nat. Sci. 



Phil., pi. xii,figs. 4a, 4b, Ham. Gr. 

 antiquum, Owen, 1852, (Pleurorhynchus 



autiqua,) Geo. Wis., Iowa, and Minn., 



pi. 2, fig. 19, Silurian, 

 attenuatum, Conrad, 1842, (Pleurorhyn- 

 chus attenuatus,) Jour. Acad. Nat. Sci., 



vol. 8, p. 252, Up. Held. Gr. 

 bifarium, Winchell, 1856, Rep. Low. Pen- 

 insula Mich., p. 95, Ham. Gr. 

 blumenbachium, see Euchasma blumen- 



bachi. 

 bovipedale, Winchell, 1862, Proc. Acad. 



Nat. Sci., p. 419, Marshall Gr. 

 carinatum, Hall, 1858, Trans. Alb. Inst., 



vol. 4, p. 14, and Bull. Am. Mus. Nat. 



Hist., p. 59, Warsaw Gr. 

 catastomum, Hall, 1858, Trans. Alb. Inst., 



vol. 4, p. 13, and Bull. Am. Mus. Nat. 



Hist., p. 58, Warsaw Gr. 

 concinnum, Hall, 1883, Pal. N. Y., vol. 5, 



pi. 68, figs. 26-27, Ham. Gr. 

 crassifrons, Conrad, 1842, (Pleurorhyn- 

 chus crassifrons,) Jour. Acad. Nat. Sci., 



vol. 8, p. 252, Ham. Gr. 

 cuneatum, Hall. 1858, Trans. Alb. Inst., 



vol. 4, p. 14, and Bull. Am. Mus. Nat. 



Hist., p. 60, Warsaw Gr. 

 cuneus, Conrad, 1840, (Pleurorhynchus 



cuneus,) Ann. Rep. N. Y., p. 206, and 



Pal. N. Y., vol. 5, pi. 67, figs. 21-32, Up. 



Held. Gr. 

 denticulatum, Hall, 1883, Pal. N. Y., vol. 



5, pi. 68, fies. 24-25, Ham. Gr. 

 eboraceum, Hall, 1860, 13th Rep. N. Y. 



Mus. Nat. Hist., p. 91, and Pal. N. Y., 



vol. 5, p. 412, Ham. Gr. 

 elegantulum, Billings, 1866, Catal. Sil. 



Foss., Antic., p. 53, Anticosti Gr. 

 emmetense, Winchell, 1866, Rep. Low. 



Peninsula Mich., p. 95, Ham. Gr. 

 immaturum, Billings, 1862, Pal. Foss., 



vol. 1, p. 41, Black Riv. Gr. 

 inceptum, Hall, 1859, Pal. N. Y., vol. 3, 



p. 491, Low. Held. Gr. 

 liratum, Hall, 1883, Pal. N. Y., vol. 5, pi. 



68, figs. 28-29, Chemung Gr. 

 meekanum, Hall, 1858, Trans. Alb. Inst, 



vol. 4, p. 15, and Bull. Am. Mus. Nat. 



Hist., p. 61, Warsaw Gr. 

 napoleonense, Winchell, 1862, Proc. Acad. 



Nat. Sci., p. 419, Marshall Gr. 

 nasutum, Hall, 1883, Pal. N. Y., vol. 5, pi. 



67, figs. 12-20, Schoharie grit, 

 nevadense, Walcott, 1885, Monogr. U. S. 



Geo. Sur., vol. 8, p. 177, Devonian. 



niagarense, Winchell & Marcy, 1865, Mem. 

 Bost. Soc. Nat. Hist., p. 97, Niag- 

 ara Gr. 



normale, Hall, 1883, Pal. N. Y., vol. 5, pi. 



68, figs. 17-19, Ham. Gr. 

 obliquum, Meek & Worthen, 1865, Proc. 



Acad. Nat. Sci. Phil., p. 249, and 

 Geo. Sur. 111., vol. 6, p. 529, Coal 

 Meas. 



