THE 
AMERICAN NATURALIST 
Vot. XXVII. ` July, 1893. 319 
SOME CORRELATIONS OF ONTOGENY AND PHYLO- 
GENY IN THE BRACHIOPODA. 
By C. E. BEECHER. 
The parallelism between the ontogeny and phylogeny in the 
Brachiopoda has been worked out in numerous instances. 
To illustrate these, some more or less familiar genera may be 
taken as characteristic examples. 
ingula has been shown by Hall and Clarke (Pal. N. Y., 
Vol. VIII, 1892) to have had its inception in the Ordovician. 
In the ontogeny of both recent and fossil forms, the first shelled 
stage has a straight hinge line, nearly equal in length to the 
width of the shell This stage may be correlated with the 
more ancient genus Paterina, from the lowest Cambrian. Sub- 
sequent growth produces a form resembling Obolella, a Cam- 
brian and Lower Silurian genus. Then the linguloid type of 
|. $irueture appears at an adolescent period, and is completed at 
1C. E. Beecher. Development of the Brachiopoda. Part I, Introduction. Am, 
Jour. Sci., Vol. XLI, April, 1891. 
Development of the Brachiopoda. Part II, Classification of the Stages of Growth 
and Decline. Am. Jour. Sci., Vol. XLIV, August, 1 
Development of Bilobites. Am. Jour. Sci., Vol. l XLI, July, 1891. 
Revision of the Families of Loup-bésring. Brachiopoda. Trans. Conn. Acad. Sci., 
Vol. IX, May, 1893. 
Deslongchamps e. Etudes critiques sur des Brachiopodes Nouveau ou peu connus, 
1884. 
Fischer and CEblert. Brachiopodes: Mission Scientifique du Cap Horn, 1882- 
1888. comm Hut Np qM, VE V. TE 
Mo. Bot. Garden, 
is 
