514 



LAMELLIBRANCHIA TA. 



[SPI. TEI. 



subtortuosus, Hall, 1870, (Sanguinolites 

 subtortuosus,) Prelim. Not. Lam. Shells, 

 p. 41, and Pal. N. Y., vol. 5, p. 397, 

 Ham. Gr. 



telamon, Hall, 1885, Pal. N. Y., vol. 5, p. 

 406, Waverly Gr. 



truncatus, Conrad, 1842, (Cypricardites 

 truncatus,) Jour. Acad. Nat. Sci., vol. 

 8, n. 244, Ham. Gr. 



undatus, Hall, 1885, Pal. N. Y., vol. 5, p. 

 506, Chemung Gr. 



valvulus, Hall, 1870, (Sanguinolites val- 

 vulus,) Prelim. Not. Lam. Shells, p. 46, 

 and Pal. N. Y., vol. 5, p. 403, Wa- 

 verly Gr. 



FIG. 928 Spirodomus insignia. 



SPIRODOMUS, Beecher, 1886, 39th Rep. N. Y. 

 Mus. Nat. Hist. [Ety. speira, spire; 

 demos, house.] Equivalve, elongate- 

 spiral ; beaks terminal ; muscular im- 

 pressions at the two extremities; no 

 hinge-line. Type S. insignis. 

 insignis, Beecher, 1886, 39th Rep. N. Y. 



Mus. Nat. Hist., Waverly Gr. 

 STBEBLOPTERIA, McCoy, 1851, Ann. Mag. 

 Nat. Hist., 2d series, vol. 7, p. 170, and 

 Brit. Pal. Rocks, p. 482. [Ety. streblos, 

 turned the wrong way ; pteron, a wing.] 

 Pectinoid, ovate, or rounded, obliquely 

 extended toward the anterior side; 

 posterior wing rectangular, anterior ear 

 small, deeply defined ; surface smooth 

 or radiately ridged ; large, faintly marked 

 muscular impression behind the middle ; 

 short, narrow tooth posterior to the 

 beaks ; ligament confined to a narrow, 

 simple facet on the hinge margin. 

 Type S. laevigata. 



similis, Walcott, 1885, 

 Monogr. U. S. Geo. 

 Sur., vol. 8, p. 230, 

 Carboniferous, 

 tenuilineata, Meek & 

 Worthen, 1860, (Pec- 

 ten tenuilin e a t u s , ) 

 Proc. Acad. Nat. Sci., 

 Phil., p. 452, and Geo. 

 Sur. 111., vol. 2, p. 

 334, Coal Meas. 

 TECHNOPHOHUS, n. gen. [Ety. techne, art; 

 phoros, bearing.] Shell small, equi- 

 valve, inequilateral ; anterior end short, 

 broadly rounded ; two or more fur- 

 rows arising near the beak extend to 

 the postero-basal margin ; beak small, 

 upright ; surface concentrically lined ; 

 umbonal rib in front of the beak repre- 

 sented in the cast by a transverse sul- 

 cus ; no external ligament, escutcheon, 

 or lunule. Type T. faberi. 



faberi, n. sp. Shell small, equivalve, in- 

 equilateral, a little longer than high ; an- 

 teriorend short, broadly rounded; base 

 more narrowly rounded in the anterior 

 and central part ; the postero-basal 

 part slightly produced; cardinal line 

 straight or nearly so ; beak extremely 

 small and standing upright, like a little 

 point projecting beyond the cardinal 

 line ; valves convex in the umbonal re- 

 gion ; two furrows or cinctures arising 

 near the beak in the umbonal region, 

 which gradually widen, are directed to 

 the postero-basal margin, and above 

 these the postero-dorsal part of the shell 

 is somewhat wing-like; 

 surface marked by very 

 fine concentric lines ; 

 the casts show a deep 

 sulcus directly in front 

 of the beak for the re- 

 ception of an umbonal 

 rib, or support on the 

 interior of the shell. 

 Hud. Riv. Gr., near 

 Sharonville, Hamilton County, Ohio. 

 Collected by Mr. Charles Faber. 





FIG. 929. Streblop- 

 terla si mills. 

 Right valve. 



FIG. 930. Technophorus faberi. The right baud 

 figure shows the left valve with a small piece 

 broken from the posterior end ; the left baud 

 figure represents a well-preserved cast; the 

 central figure presents a cardinal view. 



Tdlina, Linnaeus, 1758, Syst. Nat,, 10th ed. 

 [Ety. telline, a sort of mussel.] This ge- 

 nus unknown in the Palaeozoic rocks. 



(?) ovata, Hall, 1843, Geo. Rep. 4th Dist. 



N. Y. Syn. for Paleeoneilo maxima. 

 TELLINOMYA, Hall, 1847, Pal. N. Y., vol..l, p. 

 151. [Ety. from the resemblance to the 

 genera Tellina and Mya.~\ Nearly equi- 

 lateral, generally transverse, anterior 

 side largest ; beaks approximate, not 

 prominent ; hinge-line with a double 

 series of bent teeth connected by smaller 

 ones beneath the beak ; ligament pos- 

 terior, external, on a fulcrum; no 

 striated area or cartilage pit ; muscular 

 impressions strong not bounded by 

 elevated lines ; pallial line simple. 

 Type T. nasuta. 



abrupta, Billings, 1862, (Ctenodonta ab- 

 rupta,) Pal. Foss., vol. 1, p. 46, Black 

 Riv. Gr. 



jequilatera, Hall, 1852, Pal. N. Y., vol. 2, 

 p. 330, Coralline limestone. 



alta, Hall, 1861, Geo. Rep. Wis., p. 27, 

 and Geo. Sur. 111., vol. 3, p. 309, Tren- 

 ton Gr. 



anatini form-is, see Pterotheca anatini- 

 formis. 



angela, Billings, 1865, (Ctenodonta an- 

 gela,) Pal. Foss., vol. 1, p. 221, Que- 

 bec Gr. 



