PAL.] 



LAMELLIBRANCHIA TA. 



499 



obliqua, Hall, 1845, (Nucula obliqua,) 

 Am. Jour. Sci., vol. 48, p. 292, and 

 Ohio Pal., vol. 1, p. 139, Hud. Riv. Gr. 

 PALJSONEILO, Hall, 1870, Prelim. Notice 

 La"m. Shells, p. 6. [Ety. palaios, an- 

 cient; Neilo, a genus.] Nuculiform, 

 posterior end extended, sulcus along 

 the umbonal slope ; surface concen- 

 trically striated or ribbed ; hinge-line 

 arcuate, crenulate, not interrupted be- 

 neath the beak by a ligamental pit; 

 ligament external; anterior and pos- 

 terior adductor scars distant; pedal 



scars within the 

 Type P. constricta. 



FIG. 879. Palseoneilo bed 

 fordeusis. 



umbonal cavity. 



angusta, Hall, 

 1885, Pal. N.Y., 

 vol. 5, p. 344, 

 Chemung Gr. 

 arata, Hall, 1883, 

 Pal. N. Y., vol. 

 5, pi. 50, fig. 23, 

 Ham. Gr. 



attenuate, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 12, and Pal. N. Y., vol. 5, pi. 

 50, figs. 34-39, Waverly Gr. 

 barrisi, White & Whitfield, 1862, (Leda 

 barrisi,) Proc. Bost. Soc. Nat. Hist., vol. 

 . 8, p. 298, syn. for P. nuculiformis. 

 bedfordensis, Meek, 

 1875, Pal. Ohio, vol. 2, 

 p. 298, Waverly Gr. 

 bisulcata, Hall, 1870, 

 Prelim. Notice Lam. 

 Shells, p. 10, and Pal. 

 N. Y., vol. 5, pi. 50, FIG. 880. Paleeo- 

 figs. 13-14, Ham. Gr. neilo bedforden- 

 brevis, Hall, 1870, Pre- sls ' Magnified, 

 lim Notice Lam. Shells, p. 10, and Pal. 

 N. Y., vol. 5, pi. 50, figs. 24-33, Che- 

 mung Gr. 



carbonaria, see Yoldia carbonaria." 

 constricta, Conrad, 1842, 

 (Nuculites constrictus,) 



filosa, Conrad, 1842, (Nuculites filosus,) 

 Jour. Acad. Nat. Sci., vol. 8, p. 250, and 

 Pal. N. Y., vol. 5, pi. 49, figs. 33-38, Che- 

 mung Gr. 



fcecunda, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 8, and Pal. N. Y., vol. 5, pi. 



49, figs. 13-24, Ham. Gr. 

 maxima, Conrad, 



1841, (Nuculites 

 maximus,)Ann. 

 Rep. N. Y., p. 



50, and Pal. 

 N. Y., vol. 5, pi. 

 48, figs. 29-38, 



Ham. Gr. FIG. 882. Palseoneilo max- 



muta, Hall, 1870, ima. Right valve. 

 Prelim. Notice Lam. Shells, p. 8, and Pal. 

 N. Y., vol. 5, pi. 49, figs. 25-32, Ham. Gr. 



nuculiformis, Stevens, 1858, (Leda nucu- 

 liformis,) Am. Jour. Sci. and Arts, 2d 

 ser., vol. 25, p. 262, Waverly Gr. 



parallela, Hall & Whitfield, 1870, 23d Rep. 

 N. Y. Mus. Nat. Hist, p. 241, Wa- 

 verly Gr. 



perplana, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 12, and Pal. N. Y., vol. 5, pi. 

 50, figs. 15-22, Ham. Gr. 



plana, Hall, 1870, Prelim. Notice Lam. 

 Shells, p. 7, and Pal. N. Y., vol. 5, pi. 

 48, figs. 21-28, Ham. Gr. 



similis, Whitfield, 1882, Ann. N. Y. Acad. 

 Sci., vol. 2, p. 217, Erie shale, Por- 

 tage (?) Gr. 



tenuistriata, Hall, 1870, Prelim. Notice 

 Lam. Shells, p. 9, and Pal. N. Y., vol. 5, 

 pi. 49, figs. 1-12, Ham. Gr. 



truncata, Hall, 1883, Pal. N. Y., vol. 5, pi. 

 50, figs. 40-41, Chemung Gr. 



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



340, Ham. Gr. 



PAL^OPINNA, Hall, 1883, Pal. N. Y., vol. 5, 

 pt. 1, p. 4. (Plates and Explanations.) 



FIG. 881. Palseoneilo constricta. 

 Left valve enlarged, showing 

 creuulationsof hinge-line. 



Jour. Acad. Nat. Sci., vol. 



8, p. 249, and Pal. N. Y., 



vol. 5, pi. 48, figs. 1-15, Chemung Gr. 

 constricta var. flexuosa, Hall, 1883, Pal. 



N. Y., vol. 5, pi. 48, figs. 16-20, Ham. Gr. 

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



348, Up. Held. Gr. 

 elongata, Hall, 1883, Pal. N. Y., vol. 5, pi. 



48, fig. 39, Chemung Gr. 

 emarginata, Conrad, 1841, (Nuculites 



emarginata,) Ann. Rep. N. Y., p. 50, 



and Geo. Wis., vol. 4, p. 337, Ham. Gr. 



FIG. 883. Palseopinna Habellum. 



[ [Ety. palaios, ancient ; Pinna, a genus.] 

 Shells large, gaping in front; hinge-line 

 straight , ligamental area narrow, lon- 

 gitudinal groove and slight oblique 

 furrow extending backward from the 

 beak; beak anterior, terminal, directed 

 forward ; test more convex, and with 

 finer rays than on the ordinary Pinna, 

 and also finely marked with concen- 

 tric strise of growth. Type P. flabellum. 



