BRACHIOPODA. 249 



ment of the internal septa and spondylium is the same as in Penfamerus oblongus, 

 except that the supporting septa of the brachial valve are higher and more 

 nearly vertical. 



Type, Capellinia mira, sp. nov. Niagara dolomites of Wisconsin. 



Observations. This remarkable shell is virtually a Penfamerus oblongus in 

 which the relative convexity of the valves is reversed and this reversion car- 

 ried to a great extreme. The single species observed, which has not before 

 been described, has been studied from a number of examples obtained from the 

 dolomites of Niagara age, in the vicinity of Milwaukee, Wisconsin, and loaned 

 for study and use in the preparation of this volume by T. A. Greene, Esq., of 

 that city. It has not been observed elsewhere. These reversed shells have 

 aflforded no evidence that a normal relation of the valves existed in early 

 growth-stages, and in this respect they diflfer from the reversed shells of the 

 genus Anastrophia. 



Genus STRICKLANDINIA, Billings. (1863) 1859. 



PLATE LXXUI. 



1839. Spiri/er Atrypa, J. db C. Sowbrby. Silurian System, pi. xxi, figs. 8, 21; pi. xxii, fig. 6. 



1846. Spiri/er, McCoy. Silurian Fossils of Ireland, ]>. 37, pi. iii, fig. 24. 



1848. Spirifer, db Vernkuil. Bull. Soc. Geol. France, second ser., vol. v, p. 347. 



1852. Spirifer, Hall. Pulfeontology of N. Y., vol. ii, p. 66, pi. xxii, fig. 3. 



1859. Pentamirm, Palter. Murchison's Siluria, second ed., pp. 100, 230, figs. 1, 3. 



1859. Striiklandia, Billikgs. Canadian Naturalist and Geologist, vol. iv, p. 132-135. 



1861. Stricklandia, Billimgs. Canadian Journal, vol. vi, p. 265. 



1862. Stricklandia, Billings. Palseozoic Fossils, vol. i, p. 84. 



1863. Stricklandia, Billi.nos. Proc. Portland Soc. Nat. Hist., vol. i, p. 114. 



1863. Strlcklandinia, Billings. Canadian Naturalist and Geologist, vol. viii, p. 370. 



1866. Stricklandinia, Billings. Catalogue Silurian Fossils of Anticosti, p. 45. 



1867. Stricklandinia, Hall. Twentieth Ann. Rept. N. Y. State Cab. Nat. Hist., p. 160. 

 1867. Stricklandinia, Hall. Pala;ontology of N. Y., vol. iv, p. 369. 



1867. Stricklandinia, Davidson. British Silurian Brachiopoda, pp. 157-163, pi. xix,fig8. 13-23; pi. xx, 



figs. 1-13. 



1868. Stricklandinia, Billings. Geological Magazine, vol. v, p. 59, pi. iv. 



1870. Stricklandinia, Meek and Wobthbs. Proc. Acad. Nat. Sci. Philadelphia, vol. xiv, second ser., 

 p. 37. 



1874. Stricklandinia, Billings. Palasozoic Fossils, vol. ii, pp. 78, 81, 83, fig. 49; pp. 84-89, pi. vi, 



figs. 1,2; pi. vii, figs. 1, 4. 



1875. Stricklandinia, Meek and Worthen. Geol. Survey of Illinois, vol. vi, p. 502, pi. xxiv, fig. 5. 



1876. Stricklandinia, White Proc. Acad. Nat. Sci. Philadelphia, vol. vi, third ser., p. 30. 



1877. Stricklandinia, Whitfield. Annual Rept. Geol. Survey of Wisconsin, p. 81. 



1880. Stricklandinia, Dawson. Canadian Naturalist and Geologist, vol. ix, second ser., p. 341. 



