384 



BRACHIOPODA. 



[SYR. TER. 



in the dorsal; beaks incurved, sub- 

 equal; surface radiated, forming inter- 

 locking angular projections at their 

 terminations ; shell structure punctate. 

 Type S. hemiplicatum. 



FIG. 625. Syntrielasma hemiplicalum. /, Dental 

 laminge ; ra, mesial septum. 



hemiplicatum, Hall, 1852, (Spirifera hemi- 

 plicata,) Stan.'s Ex. to Great Salt Lake, 

 p. 409, Coal Meas. 



SYRINGOTHVRIS, Winchell, 1863, Proc. Acad. 

 Nat. Sci., p. 6. [Ety. syrinx, a tube; 

 thyris, a window.] General aspect like 

 Spirifera; shell substance fibrous and 

 impunctate; beak extremely elevated; 

 area of ventral valve large, with a nar- 

 row triangular fissure closed toward the 

 apex by an external, convex pseudo- 

 deltidium, beneath which, and di- 

 verging from it, is another transverse 

 plate, connecting the vertical dental 

 lamellae, arched above, and beneath 

 giving off a couple of median parallel 

 lamellae, which are incurved so as to 

 nearly join their inferior edges, thus 

 forming a slit-bearing tube, which pro- 

 jects into the interior of the shell. Type 

 S. typus. 

 halli, Winchell, 1863, Proc. Acad. Nat. 



Sci., p. 8, Marshall Gr. 

 typus, Winchell, 1863, Proc. Acad. Nat. 

 Sci. Phil., p. 7, Marshall Gr. 



TEREBRATUL A ; Lib wydj!699, 

 Lith. Brit. Ichn. [Ety. 

 diminutive of tere- 

 bratus, perforated.] 

 Shell variable in form, 

 oval, elongated or 

 transverse ; smooth or 

 plicated ; valves un- 

 equally con vex; hinge- 

 line curved; beak 

 short, truncated by a foramen ; deltid- 

 ium in one or two pieces ; loop short ; 

 confined to the posterior portion of the 

 shell, not more than one-third the 

 length of the valve, simply attached to 

 a hinge plate ; two ribbon-shaped la- 

 mellae are united by a transverse lamella 

 bent upward in the middle; the cirrated 

 arms are supported by the crura, and 

 project in front of the loop ; no median 

 septum in the socket valve. Type T. 

 vitrea and T. maxillata. 



FIG. 626. Tere- 

 bratula maxil- 

 lata. 



acuminatissima, Castelnau, 1843, Syst. Sil., 

 p. 40. Not recognized. 



affinis, syn. for Atrypa reticularis. 



aprinis, see Rhynchonella aprinis. 



arcuata, Swallow, 1863, Trans. St. Louis 

 Acad. Sci. The name was preoccupied 

 by Roemer in 1840. See T. Shumardana. 



argentea, see Athyris argentea. 



aspera, see Atrypa aspera. 



bidentata, see Rhynchonella bidentata. 



bisacula, McChesney, 1860, New Pal. Foss., 

 p. 82, Kaskaskia Gr. Not recognized. 



borealis, Castelnau, 1843, Syst. Sil., p. 40, 

 Not recognized. 



bovidens, Morton, 1836, Am. Jour. Sci., 

 vol. 29, p. 150, Coal Meas. 



brevirostris, see Rhynchonella brevirostris. 



brevilobata, Swallow, 1863, Trans. St. 

 Louis Acad. Sci., vol. 2, p. 84, Kaskas- 

 kia Gr. 



burlingtonensis, White, 1860, Bost. Jour. 

 Nat. Hist., p. 228, and Geo. Sur. W. 

 100th Mer., vol. 4, p. 93, Kinderhook Gr. 



concentrica, syn. for Athyris spiriferoides. 



cooperensis, n. sp., Keokuk Gr. Proposed 

 instead of T. parva, Swallow, 1863, 

 Trans. St. Louis Acad. Sci., vol. 2, p. 83, 

 which name was preoccupied. 



FIG. 627. Terebratula bovidens. 



crenulata, Sowerby, 1840, (Atrypa crenu- 



lata,) Geo. Trans., 2d series, vol. 5, p. 



704, Devonian. 



cuneata, see Rhynchonella cuneata. 

 elia, Hall, 1867, Pal. N. Y., vol. 4, p. 390, 



Up. Held. Gr. 

 formosa, Hall, 1858, Trans. Alb. Inst., vol. 



4, p. 6, and Bull. Am. Mus. Nat. Hist., 



p. 55. Warsaw Gr. 



geniculosa, syn. for Terebratula bovidens. 

 gracilis, Swallow, 1863, Trans. St. Louis 



Acad. Sci. The name was preoccupied 



by Von Buch in 1834. See T. swal- 



lovana. 

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



388, Up. Held. Gr. 

 inornata, McChesney, 1860, New. Pal. 



Foss. Garb. 



insperata, Phillips, 1841, Pal. Foss., De- 

 vonian. 



interplicata, see Anastrophia interplicata. 

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



390, Up. Held Gr. 

 lacunosa. Not American, 

 lapillus, Morton, 1836, Am. Jour. Sci. and 



Arts, vol. 29, p. 149, Coal Meas. 

 lens, see Cryptonella lens. 

 laticosta, see Atrypa laticosta. 

 lincklsmi, see Cryptonella lincklseni. 

 lynx, see Orthis lynx. 

 marcyi, see Retzia marcyi. 



