708 



ChTSTACEA. 



[JON. I.KI'. 



Chazy and Trenton (Jr.; and I. bellula 

 and f. dawsoni, p. 92, Devonian, 

 amiana, I. ampla, I. kentuckiensis, I. saf- 

 fordi, I. subnodosa, Ulrich, 1890, Jour. 

 Cin. Soc. Nat. Hist., vol. 13, pp. 177 to 

 180, Birdseye and Trenton Gr.; and I. 

 rectangularis, p. 182, Up. Held, or 

 Ham. ( ir. 

 fabacea and I. lineata, Jones, 1890, (Juar. 

 Jour. Geo. Soc, vol. 46, p. 21, Ham. Gr. 



.!o.\K.sKi.i.\, Ulrich, 1890, Jonr. Cin. Soc. Nat. 

 l list., vol. 13, p. 121. [Ety. proper name. ] 

 Carapace small, ovate, moderately con- 

 vex ; valves equal, their outline and 

 general aspect much as in I'rimitia, but 

 differing in having a simple or more or 

 less divided prominent ridge on the 

 posterior two-thirds, more or less curved. 

 Type J. crepiformis. 

 erassa, I'lrich, 1890, -lour. Cin. Soc. \at. 

 Hist., vol. 13, p. 123, Trenton <ir.; .1. 

 digitata and J. pedigera, p. 122, Hud. 

 Biv. (ir. 

 crepiformis, I'lrich, 1879, Jour. Cin. Soc. 

 Xat. Hist., vol. 2, p. 10, Hud. Riv. Gr. 



Karlia, Walcott, 1888, Proc. U. S. Nat. Mus., 

 p. HI. [Ety. from the Christian name 

 Karl, which is a violation of all rules, 

 and should l>e disregarded.] Form 

 elongate-oval, convex; head longitudi- 

 nally semicircular, deeply marked by 

 the dorsal furrows ; glabella clavate, 

 broadly expanded in front, with or 

 without faint glabellar furrows; oc- 

 cipital furrow well defined ; fixed 

 cheeks suhtriangular; posterior furrow 

 broad ; eye lobe small ; free cheeks 

 narrow ; hypostoma with a thick, 

 rounded anterior margin that is ex- 

 tended into the large lateral wings, the 

 sides of which extend one-half way 

 hack on the oval, convex body ; pos- 

 terior marginal rim strong, and sepa- 

 rated from the body by a well-defined 

 sulcus; thorax with seven segments; 

 axis with a central spine on each seg- 

 ment; pleural lobes with a broad 

 groove; anterior lateral ends of pleurae 

 faceted; pygidiuin short, transverse, 

 four to five segments in the axis, lateral 

 lobes slightly grooved ; surface granu- 

 lose. Type K. minor, described at the 

 same place from the Up. Taeonic, and 

 also K. stephenensis. 



Isoxvs, Walcott, 1890, 10th Ann. Rep. U. B. 

 Geo. Sur., p. 925. Carapace large; dor- 

 sal margin slightly curved ; dorsal angles 

 produced into sharp points; anterior 

 and posterior ends alate, subequal in 

 outline, and merging into the rounded 

 ventral margin, without forming an 

 angle ; marginal rim narrow ; valves 

 equal; surface smooth. Type I. chil- 

 howeana, Up. Taeonic. 



Kirhya, Jones, 1859, Trans. Tyneside Nat. 

 Field Club, vol. 4, p. 129. [Ety. proper 

 name.] Carapace valves compressed, 

 thick, oblong, impressed with a sub- 

 central pit and raised into ridges, some 



concentric with the margin, associated 

 sometimes with longitudinal wrinkles 

 ami by a reticulate ornament; valves 

 suboblong, higher behind than before; 

 extremities rounded, one more obliquely 

 than the other; dorsal border straight, 

 and its ends subacute; ventral border 

 nearly straight in its middle third, and 

 broadly curved at the ends ; hinge 

 simple; ventral edge of the dextral 

 valve overlaps slightly that of the 

 other. Subcentral pit variahle. Type 

 K. permiana. 



lindahli, Ulrich, 1890, .lour. Cin. Soc. Nat. 

 Hist., vol. 18, p. 207, St. Louis (ir., and 

 K. venosa, p. 208, Kaskaskia Gr.; K. 

 parallela, K. semimuralis, K. suhquad- 

 rata. p. 192, Up. Held, or Ham. (ir. 

 Mr. Ulrich also identifies K. oblonga 

 and K. tricollina, Jones & Kirbv, pp. 

 208 and 207, Kaskaskia (ir., and K. 

 costata, McCoy, p. 208, St. Louis Gr. 



walcotti, Jones, 1890,(Primitia(?) walcotti), 

 nnar. Jour. Geo. Soc, vol. 4(>, p. 543, 

 Ham. Gr. 

 Ki.okokma, Jones <k Holl, 1886, Ann. and 

 Mag. Nat. Hist., ser. 5, vol. 17, p. 347. 

 [Ety. proper name.] Carapace valves 

 smooth, convex, impressed with two 

 short, vertical furrows on the dorsal 

 region, and a third .smaller furrow de- 

 fines a narrow semi-lune at the front 

 end of the valve. Type K. wilkensana. 

 Bey rich ia notata and B. notata var. 

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

 pp. 379, 380, Low. Held. Gr., are re- 

 ferred by Jones to this genus. 

 Lki'kkditia was derived from a proper 

 name. There is generally a tubercular 

 eye-spot near the hinge, below and 

 behind which there is a slight inflation 

 and a vertical groove, extending from 

 the dorsal margin part way across the 

 valves. 



.cquilatera, fiirbriata, dorsicornis, grani- 

 lirata, germana, millepunctata, intlata, 

 mundula, sulcata, and tumida, Ulrich, 

 1892, Am. Geol., vol. 10, pp. 264 to 269, 

 Birdseye, Trenton, and Hud. Riv. Grs. 



appressa, L. caecigena var. frankfortensis, 

 L. linneyi, L. tumidula, Ulrich, 1890, 

 Jour. Cin. Soc. Nat. Hist., vol. 13, pp. 

 174 to 177, Trenton (Jr.; L. nicklesi, p. 

 200, Warsaw (ir.; L. subrotunda, p. 181, 

 Up. Held, or Ham. Gr. 



balthica var. prima; va, L. obscura, Jones, 

 1891, Cont. to Micropal., p. 70, Trenton 

 (ir.; L. balthica var guelphica, L. his- 

 ingeri var. egena, var. fabulina, var. 

 gibbera, L. caeca, L. phaseolus var. 

 guelphica, L. selwyni, L. whiteavesi, 

 pp. 80 to 89, Niagara and Guelph Gr.; 

 L. exigua, p. 94, Devonian. 



canadensis var. nana, syn. for L. canadensis. 



claypolei, Jones, 1890, Qnar. Jour. Geo. 

 Soc, vol. 46, p. 25, Hud. Riv. Gr. 



crepiformis. see Jonesella crepiformis. 



frontalis, Jones, 1890, Quar. Jour. Geo. 

 SoC, vol. 46, p. 547. Anticosti^Gr. 



