BRACHIOPODA. 
189 
in it a nearer relationship to Rhynchotrema, than to the Silurian and Devonian 
representatives of Camarotcechia; in other words, the existence or absence of 
the median brachial septum should be regarded as of less significance than the 
co-existence of a similar type of hinge-structure. 
In exterior characters Stenoschisma formosa is a trihedral, strongly plicated 
shell with well-developed fold and sinus, of an expression not uncommon 
throughout the Devonian rhynchonellids. 
Genus CAMAROTCECHIA, nom. nov. 
PLATE LVII. 
1841. Atrypa, Conrad. Ann. Kept. Palseont. Dept. N. Y., p. 55. 
1843. Atrypa, Hall. Geology of New York ; Kept. Fourth Dist. ; Tables of Organic Remains, No. 66, 
figs. 3, 4 ; No. 67, fig. 2. 
1847. Atrypa, Hall. Palseontology of New York, vol. i, pp. 21, 23, pi. iv (bis), figs. 7, 9. 
1852. Atrypa, Hall. Palseontology of New York, vol. ii, p. 70, pi. xxiii, figs. 4, 5; p. 274, pi. Ivii, 
fig. 1; p. 279, pi. Iviii, figs. 3, 4. 
1857. Rhynchonella, Hall. Tenth Ann. Kept. N. Y. State Cab. Nat. Hist., p. 78, figs. 1-7; p. 82, 
figs. 1-3; pp. 81, 86. 
1860. Rhynchonella, Billings. Canadian Journal, vol. v, pp. 271, 272. 
1860. Rhynchonella, Hall. Thirteenth Ann. Kept. N. Y. State Cab. Nat. Hist., pp. 87, 88. 
1862. Rhynchonella, A. Winchkll. Proc. Acad. Nat. Sci. Philadelphia, pp. 407, 408. 
1862. Rhynchonella, Billings. Palseozoic Fossils, vol. i, pp. 141-143, figs. 118-120. 
1863. Rhynchonella, Hall. Ti-ansactions of Ihe Albany Institute, vol. iv, pp. 215, 216. 
1867. Rhynchonella (Stenocisina), Hall. Palffiontology of New York, vol. iv, pp. 335-345, 348-353, 
pi. liv, figs. 1-59 ; pi. liva, figs. 1-23, 44-49 ; pi. Iv, figs. 1-52. 
1879. Rhynchonella, Hall. Twenty-eighth Rept. N. Y. State Mus. Nat. Hist., pp. 163, 164, pi. xxvi, 
figs. 12-33. 
1882. Rhynchonella, Hall. Eleventh Ann. Rept. State Geologist of Indiana, pp. 305-307, pi. xxvi, 
figs. 12-33. 
1884. Rhynchonella, Walcott. Monogr. U. S. Geol. Survey, vol. viii, p. 152, pi. xiv, fig. 3; pi. xv, 
tig. 6; p. 155, pi. xiv, fig. 8. 
1887. Rhynchonella, Gosselbt. Annales de la Soci6te Geologique du Nord, vol. xiv, p. 188, 
pis. i-iii. 
1888. Rhynchonella, Herrick. Bulletin Labor. Denison Univei-sity, vol. iii, pp. 39, 40, pi. v, tig-. 1; 
pi. vii, fig. 25 ; pi. x, fig. 9. 
By restricting the application of the term Stenoschisma to shells agreeing in 
hinge-structure with Rhynchonella formosa, the necessity is created for a new 
designation for the large group of shells to which that term was applied in 
1867.* While these shells are susceptible to considerable variation in exterior, 
* Palaeontology of New York, vol. iv. 
