438 Systematic Paleontology 



Trematospira multistriata (Hall) 

 Plate LXXIII, Figs. 3, 4 



Spirifer multistriata Hall, 1857, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist 



p. 59, flgs. 1-6. 

 Spirifer perforata Hall, 1857, Tenth Ann. Rept. N. Y. State Cab. Nat. Hist 



p. 60. 

 Trematospira multistriata Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 209, 



pi. xxiv, figs. 3a-3/; pi. xxviiia, flgs. 5a-5/. 

 Trematospira perforata Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 208, pi. 



xxviiia, figs. 3i-3fc. 

 Retzia multistriata Billings, 1863, Geol. Can., p. 958, text fig. 458. 

 Trematospira multistriata Hall, 1867, Nat. Hist. N. Y., Pal., vol. iv, p. 276 



text figs. 1-3. 

 Trematospira perforata Hall, 18G7, ibidem, p. 276. 

 Trematospira multistriata Hall and Clarke, 1893, ibidem, vol. viii, pt. ii, p, 



126, text fig. 110, pi. xlix, figs. 9-14. 

 Trematospira perforata Hall and Clarke, 1893, ibidem, vol. viii, pt. ii, pi 



xlix, figs. 5, 6. 

 Trematospira multistriata Clarke, 1900, Mem. N. Y. State Mus., vol. iii. No. 3 



p. 43, pi. vi, flgs. 1-4. 

 Trematospira multistriata Weller, 1903, Geol. Surv. N. J., Pal., vol. iii, p 



315, pi. xxxviii, figs. 8-10. 



Description. — " Shell transversely oval, or pentagonal with the angles 

 rounded : ventral valve moderately convex towards the beak, with a broad 

 (not sharply defined) sinus below, which often becomes obsolete before 

 reaching the beak; beak abruptly incurved over the beak of the opposite 

 valve : dorsal valve more convex than the opposite, the middle elevated in 

 a broad scarcely defined lobe ; beak closely incurved : hinge-line slightly 

 declining on each side of the center, and rounded at the extremities ; area 

 narrow, strongly striated longitudinally. Surface marked by numerous 

 fine strise which bifurcate once or oftener between the beak and base of 

 the shell, concentrically crossed by imbricating lamellae. [Surface granu- 

 lose.]" Hall, 1857. 



In Mainland this characteristic Helderberg fossil does not attain the 

 large size nor the abundant plicating of the New York full-grown ex- 

 amples. The southern examples agree better with the smaller forms of 

 this species, which Hall named T. perforata. This form has the wider 

 range, both geographic and geologic. However, there can be no doubt that 

 the bundling of the plications, their number, and the general expression 



