54 
PALEONTOLOGY OF NEW YORK. 
shell, Spiriferina cristata, Schlotheim, var. octoplicata and S. insculpta,* in which 
it has not been conclusively shown that the median septum exists, though this 
is a legitimate inference. The gradual assumption of the punctated structure 
is not so clearly defined among these forms as in the syringothyroid line of 
development, although one species, the Spirifer transversus, McChesney, from 
the Chester limestone, is a septate shell in which punctation is but feebly and 
sparsely developed. 
The American species which may be referred to Spiriferina are few. The 
Spirifer solidirostris, White, of the Kinderhook group, is a septate-lamellose shell, 
but the specimens we have examined do not evince punctation. Spiriferina 
spinosa, Norwood and Pratten, and S. transversa, McChesney, of the Chester 
(Kaskaskia) limestone, S. subelliptica, McChesney, of the Keokuk group; S. Ken- 
tuckiensis, Shumard, and var. propatula, Swallow, and S. spinosa, var. campestris, 
White, of the Coal Measures, are characteristic representatives. The forms which 
have been described as S. Billingsi, Shumard, S. binacuta and S. Clarksvillensis, 
Winchell, and S. subtexta, White, have not come under our observation. It 
should be remarked that Walcott has regarded f S Kentuckensis and var. propa¬ 
tula, and S. spinosa as synonyms of Spiriferina cristata (Schlotheim), Davidson. 
Genus AMBOCCELIA, Hall. 1860. 
PLATE XXXIX. 
1842. Orthis, Conrad. Journal Acad. Nat. Sci. Philadelphia, vol. viii, p. 264. 
1843. Orthis, FIadl. Geology of N. Y. ; Rejit. Fourth Dist., p. 180, fig. 8; p. 267, fig. 5. 
1846. Orthis, Rouault. Bull. Soc. Geol. de France, sec. ser., vol. iv, p. 322, pi. iii, fig. 8. 
1857. Orthis, Hall. Tenth Rept. N. Y. State Cab. Nat. Hist., p. 167, figs. 1-3. 
1860. Amboccelia, Hall. Thirteenth Rept. N. Y. State Cab. Nat. Hist., ji. 71, figs. 1-3;p. 72, figs. 4-6; p. 81, 
1862. Ambocuslia {Spirifer ?), White. Pi-oc. Boston Soc. Nat. Hist., vol. ix, p. 26. 
1864. Amboccelia, Meek and Havden. Palaiontology of the Upper Missoui'i, p. 20. 
1867. Amboccelia, Hall. Palieontology of N. Y., vol. iv, pp. 258-262, pi. xliv, figs. 1-25. 
1883. Amboccelia, Claxpole. Proc American Philosophical Society, vol. xxi, p. 232. 
1887. A7nbocoella, CEhlert. Bull, de la Soc. d’Etudes Scientif. d’Angers, p. 6, pi. v. figs. 11-16. 
1889. Amboccelia, Nettblkoth. Kentucky Fossil Shells, xip. 85, 86, iil. xvii, figs. 25, 26. 
Diagnosis. Shells small, concavo-, or plano-convex. Marginal outline nearly 
semicircular. Hinge-line long and straight, its length nearly or quite equaling 
the greatest transverse diameter of the shell. 
* Devonian Brachioxioda, xip- 46, 48, xd. iv, figs. 11-17. 
t Palseontology of the Eureka District, xi. 218. 1884. 
