INDEX. 



841 



LinguUlla similis, described 532 



compared with Lingutella desiderata 492 



Lingulella teos 514 



general geographic and stratigraphic distribution 



tabulated 103 



type specimen iigured PI. XXI, fig. 2 



visceral area (splanehnocoele) characterized 470 



? simpler., described 534 



general geographic and stratigraphic distribution 



tabulated 103 



type specimen not figured. 



iarpa descril^ed 534 



compared with Lingulella franklinensis 502 



Lingulella ino 507 



general geographic and stratigraphic distribution 



tabulated 103 



151)0 specimen figured PI. XXIII fig. 2a 



texana, described 535 



general geographic and stratigraphic distribution 



tabulated 103 



type specimen figured PI. XLIX flg. 3a 



tonentis described 535 



general geographic and stratigraphic distribution 



tabulated 103 



type specimen figured PI. XXXV, flg. 7 



, described 536 



compared with Lingulella (Lingulepis) gregwa 556 



Lingulella (Lingulepis) longinervis 556 



Lingulella (Lingulepis) pumila 556 



Obolus ? torrentis 418 



general geographic and stratigraphic distribution 



tabulated 103 



intermediate between Lingulella (Lingulepis) gregwa 



and Lingulella (Lingulepis) longinervis 556 



type specimen not figured. 



iumida, described 537 



confused with Lingulella (Lingulepis) gregwa 537, 554 



general geographic and stratigraphic distribution 



tabulated 103 



type specimen not figured. 



"unguiculus" mentioned 497 



upis, described 538 



compared with Lingulella wanniecki 538, 539 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen figured PI. XXXVI, fig. 3 



wanniecki, described 538 



compared with Lingulella fuchsi 502 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen not figured. 



welleri, described 539 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen figured PI. XXXVIII, fig. 4 



Winona, described 539 



compared with Lingulella winona convexa 540 



general geographic and stratigraphic distribution tabu- 

 lated 103 



groupedonthebasisoftheoutlineoftheventral valve. 470 

 type specimen not figured. 



winona convexa, described 540 



compared with Obolus pheres 408 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen figured PI. XVIII, flg. 4a 



wirtlii, described 541 



compared -with Lingulella cedens 485 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen flguxed PI. XXX, flg. 7 



zeus, described. . . ' 541 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen figured te.xt flg. 45, 541 



sp. undt. a, described 541 



compared with Lingulella agnostorum 476 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen flgnred PI. XXX, flg. 13 



Lingulella sp. undt. b, described • - 641 



general geographic and stratigraphic distribution tabu- 

 lated 103 



tj'pe specimen not flgured. 

 sp. Kayser, discussed and compared with Lingulella davisi 



s.nd L.ampla 490^91 



"(?)sp. Matley," discussed 703 



Lingulella (Leptembolon), described 541 



characterized 473^74 



classification of 321, 323 



evolution discussed 319 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 103 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of 110 



may include Lingulella ? insons 508 



mentioned 378 



number of species of, in different types of sediment . . 160 



type species "Obolus (Leptembolon) lingulxformis" 474 



liTigulxformis, described 542 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen not figured. 



lingulseformis solidus discussed 543 



Lingulella (Lingulepis), described 644 



characterized 474 



classification of 321,323 



compared with Botsfordia 602 



Delgadclla 560 



Lingulella 472 



evolution discussed 319 



evolution of 317 



general geographic and stratigraphic distribution of 



the species referred to 103 



general stratigraphic distribution and number of Cam- 

 brian species and varieties of 110 



mentioned 378, 471, 488, 567, 668, 659, 560, 668 



number of Ordovician species and varieties of 113 



number of species of, in different types of sediment. . . 160 

 reference to, oi Lingulella (Lingulepis) acuminata meeki, 



discussed 650 



relative position of vascular sinus in species of 377 



stratigraphic distribution of species discussed 545 



surface ornamentation discussed 302 



type species " Lingula acuminata" 544 



type species of, discussed 547,548 



young shells more elongate than adult shells 473 



acuminata, described 545 



compared with Lingulella hornemanni 483 



Lingulella cuncola 488 



Lingulella signata 532 



Lingulella (Lingulepis) acuminata meeki 550 



Lingulella (Lingulepis) acuminata sequens 551 



Lingulella (Lingulepis) exigua 653,555 



Lingulella (Lingulepis) gregwa 555 



Lingulella (Lingulepis) roberti 557 



Lingulella (Lingulepis) rowei 658 



Lingulella (Lingulepis) squamosa 559 



Obolella chromatica 592 



Obolus belli ^86 



Obolus rhea 411 



Obolus sinoe 545 



Obolus (Westonia) rogersi 464 



general geographic and stratigraphic distribution tabu- 

 lated 103 



type specimen figured PI. XL, fig. 1 



acuminata meeki, described 550 



compared with Delgadella lusitanica 560 



Lingulella (Lingulepis) eros 551 



general geographic and stratigraphic distribution tab- 

 ulated 103 



type specimen figured PI. XLI, fig. 2 



acuminata sequens, described 561 



general geographic and stratigraphic distribution tab- 

 ulated 103 



type specimen figured text fig. 46A, 551 



ocMTnfTMfa wccJisi, merely an error in spelling 550,651 



eros, described 651 



general geographic and stratigraphic distribution tab- 

 ulated 103 



type speciineu flgured PI. XXXIX, fig. 9 



