342 



BRACHIOPODA. 



[cry.— cyr. 



reposita, White, 1866, Proc. Bost. Soc. 

 Nat. Hist, vol. 9, p. 8, Ham. Gr. 



reticularis, S. A. Miller, 1875, *£j^ 

 Cin. Quar. Jour. Sci., vol. 2, p. ^Hp 

 280, Hud. Riv. Gr. FlG . 555_ 



rowleyi, Gurley, 1883, New Carb. Cra n i a 

 Fobs. Kinderhook (ir. Not retjcu- 

 defined and published as re- ar 8 ' 

 quired by the rules of nomenclature. 



scabiosa, Hall, 1866, 24th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 220, Hud. Riv. Gr. 



setifera, Hall, 1863, Trans. Alb. Inst., vol. 

 4, p. 209, Niagara Gr. 



setigera, Hall, 1866, 24th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 220, Trenton (ir. 



sheldoni, White, 1862, Proc. Bost. Soc. 

 Nat. Hist., vol. 9, p. 8, Ham. (ir. 



siluriana, Hall, 1863, Trans. Alb. Inst., 

 vol. 4, p. 208, Niagara Gr. 



socialis, Ulrich, 1878, Jour. Cin. Soc. Nat. 

 Hist., vol. 1, p. 99, Hud. Riv. Gr. 



spinigera, Hall, 1879, Desc. New Spec. 

 Foes., p. 13, and 11th Rep. Geo. and 

 Nat. Hist. Ind.. p. 283, Niagara (ir. 



trentonensis, Hall, 186<>, 24th Rep. -V V. 

 St. Mus. Nat. Hist., p. 219, Tren- 

 ton Gr. 



truncata, Emmons, 1 S.">6, (Orbicula trun- 

 cata,) Am. Geol., p. 200, Trenton <.r. 

 Cryitonella, Hall, 1861, 14th Rep. N. V. 

 St. Mus. Nat. Hist., p. 102. [Sig. a 

 little cavity.] Equilateral, inequivalve. 

 elongate oval or ovoid ; valves un- 

 equally convex, no mesial fold or 

 sinus; ventral valve with beak extended 

 or incurved, perforate ; foramen termi- 

 nal ; punctate smooth or with concen- 

 tric strise ; articulating by teeth and 

 sockets; dental lamellae ofthe ventral 

 valve extending downward into the 

 cavity of the shell; crura extend in a 

 long recurved loop, with long processes 

 into the ventral valve, between which 

 and the apex they are united by a 

 transverse band. Type C. rectirostra. 

 calvini. Hall & 

 Whitfield, 1870, 

 23d Rep. N. Y. 

 St. Mus. Nat. 

 Hist., p. 239, 

 Chemung Gr. 

 circula, Walcott. 

 1885, Monogr. 

 l 8. Geo. Sur., 

 p. 163, Devonian. 



eudora, Hall, 1867, Pal. N. Y., vol. 4, p. 

 398, Chemung Gr. 



iphis, Hall, 1867, Pal. N. Y., vol. 4, p. 

 396, Up. Held. Gr. 



lens, Hall, 1860, (Terebratula lens,) 13th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 89, 

 Up. Held. Gr. 



linckljeni, Hall, 1860, (Terebratula linck- 

 lseni,) 13th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 88, Ham. Gr. 



pinonensis, Walcott, 1885, Monogr. U. S. 

 Geo. Sur., p. 163, Devonian. 



planirostra, Hall, 1860, (Terebratula plan- 

 irostra,) 13th Rep. N. Y. St. Mus. Nat. 



• I 



Fig. 556. — Cryptouella 

 llncklreni. Dorsal and 

 profile views. 



Hist., p. 89, and Pal. N. Y., vol. 4, p. 

 395, Ham. (ir. 



rectirostra, Hall, 1860, (Terebratula recti- 

 rostra,) 13th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 88, and Pal. N. Y., vol. I. p. 

 394, Ham. Gr. 

 Cyrtia, Dalman, 1827, Kongl. Vet. Acad. 

 Ilandl., p. 93. [Ety. kyriia, a fishing 

 basket.] Shell somewhat trigonal, valves 

 convex, hinge-line nearly as long as the 

 width of the shell, articulating by teeth 

 and sockets ; ventral valve deep, more 

 or less pyramidal, beak straight or 

 slightly recurved, area wide and triangu- 

 lar, fissure covered by a convex pseu- 

 dodeltidium, generally perforated close 

 to the beak by a circular foramen, a 

 longitudinal depression in the deltid- 

 ium sometimes shows, at the ex- 

 tremity a circular aperture lor the 

 passage of pedicle muscular fibers; 

 dorsal valve less convex ; a mesial lon- 

 gitudinal septum, in the ventral valve, 

 extends from the fissure to near the 

 margin, to the sides of which the 

 dental plates converge, and are united 

 after having formed the fissure walls. 

 Type C exporreeta. 



acutirostris, see Cyrtina acutirostris. 



I>iplicata,see Cyrtina biplicata. 



curvilineata, see Cyrtina curvilineata. 



dalmani, see Cyrtina dalmani. 



exporreeta, Wahlenberg, 

 1821, Nova. Acta. Begin. 

 Soc. Sci., vol. 8, p. H4, and 

 24th Rep. N. Y. St. Mus. 

 Nat. Hist., j). 183, Niag- 

 ara Gr. 



exporreeta var. arrecta, Hall K , 



& Whitlield, 1872, 24th ua expor- 

 Bep. N. Y. St. Mu.-. Nat. recta. 

 Hist., p. 183, Niagara Gr. 



hnmiltonenm, see Cyrtina hamiltonensis. 



missouriensis, see Cyrtina missouriensis. 



myrtea, Billings, 1862, 1'al. Fobs., vol. 1. 

 p. 165, Mid Si I. 



occidentalis, see Cyrtina occidentalis. 



rostrata, see Cyrtina rostrata. 



triquetra, see Cyrtina triquetra. 



umbonata, see Cyrtina umbonata. 

 Cyrtina, Davidson, 1858, Monog. Brit. 

 Carb. Brach., p. 66. [Ety. the diminu- 

 tive of Cyrtia is Cyrtidium, but the au- 

 thor said he preferred bad Greek to a 

 long name.] Spirif era-like shells; valves 

 very unequal, ventral being extremely 

 elevated, with high area and narrow 

 fissure, closed by a pseudodeltidium ; 

 dental plates converge from the inner 

 margins of the fissure, and, uniting, 

 form a septum to the bottom of the 

 internal cavity, thus dividing it into 

 two parts ; shell punctate. Type C. 

 heteroclyta. 



acutirostris, Shumard, 1855, (Cyrtia acuti- 

 rostris,) Geo. Rep. Mo., p. 204, Wa 

 verly or Choteau Gr. 



affinis, Billings, 1874, Pal. Foss., vol. 2, p. 

 49, Gaspe No. 8, Devonian. 



