BRACHIOPODA. 249 



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

 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 Pentamerus oblongm 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 

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

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

 genus Anastrophia. 



Genus STRICKLANDINIA, Billings. (1863)1859. 



PLATE LXXin. 



1839. Spirifer Atrypa, J. de C. Sowerby. Silurian System, pi. xxi, figs 3, 21; i)l. xxii, fig. 6. 



1846. Spirifer, McCoy. Silurian Fos?ils of Ireland, p. 37, pi. iii, fig-. 24. 



184S. Spirifer, de Vernedil. Bull. See. Geo!. France, second ser., vol. v, p. 347. 



1852. Spirifer. H.^ll. Palaeontology of N. Y., vol. ii, p. 66, pi. xxii, fig. 3. 



1859. PeiitamiruK, Salter. Murchison's Siluria, .second ed., pp. 100, 230, figs. 1, 3. 



18.59. Stricklandia, Billings. Canadian Naturalist and Geologist, vol. iv, p. 132-135. 



1861. Stricklandia, Billing.s. Cana<lian .Journal, vol. vi, p. 265. 



1862. Stricklandia, Billing.s. Palaeozoic Fossil.s, vol. i, p. 84. 



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



1863. Stricklandinia, 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. Pateontology of N. Y., vol. iv, p. 369. 



1867. Stricklandinia, Davidson. British Silurian Bi-aehiopoda, pp. 157-163, pi. xix, figs. 13-23; pi. xx, 



figs. 1-13. 



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



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

 p. 37. 



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



figs. 1, 2 ; pi. vii, figs. I, 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. StricMandinia, Whitfield. Annual Rept. Geol. Survey of Wisconsin, p. 81. 



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



