l^LATE XXXV—Continued. 
SriRIFER CONSOBRINUS, cVOibigiiy. 
See Plate 34. 
Fig. 18. The interior of an imperfect pedicle-valve ; showing the median septum, which appears as a low 
ridge in the bottom of the valve. 
Hamilton group. Western New York. 
Genus SPIEIFERINA, d’Orbigny. 
Page 51. 
Spiriferina transversa, McCliesnoy. 
Fig. 19. An entire specimen ; showing the general form and proportions, and the lamellose exterior. 
Fig. 20. The intei'ior of a portion of the pedicle valve ; showing the median septum. 
Chester limestone. Buzzard.^:' Boost, Alabama. 
Fig. 23. A cardinal view of an individual with a high area. 
Fig. 24. Oblique view of the interior of a pedicle-valve ; showing the median septum 
Fig. 25. The interior of a brachial valve; showing cardinal process, dental sockets and low median ridge. 
X2. 
Carboniferous limestone. Itaituba, Brazil. 
(Figs. 23-25 are from specimens figured by Derby, Bulletin of the Cornell University, vol. i, pi. ii, 
fig. 6 ; pi. iii, fig. 12 ; pi. v, fig. 4. 1874.) 
Spiriferina subeeliptica, McChe.siicy. 
Fig. 21. The intei-ior of a portion of the pedicle-valve; showing median septum and muscular scars. 
Fig. 22. The interior of a portion of the brachial valve ; showing the articulating apparatus, elevated mus¬ 
cular ridges and low median ridge. X 2. 
Keokuk group. New Providence, Indiana. 
Spiriferina spinosa, Norwood and Prattcn. 
Figs. 26, 27. Views of an entire exam 2 ')le ; showing the exterior characters. 
Fig. 28. A longitudinal median section through conjoined valves; showing- the height of the median 
sejitum. 
Fig. 29. An enlargement of the external surface ; showing the bases of the sjiinules and the imnctjB of the 
shell. 
Chester limestone. Chester)', Illinois. 
