258 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Fig. 106. — Genus Petraliella Canu and Bassler. 1927 



A. Petraliella bisinuata Smitt, 1873. Zooecia, enlarged (after Smitt, 1S73). 

 B. Petraliella chuakensis Waters, 1913. Ovicelled zooecia, X25. C-E. Petra- 

 liella -porosa Hincks, 1882. C. Operculum, X85. D. Avicularian mandible, 

 X85. E. Aperture, X50. (After Waters, 1887, 1889.) F. Petraliella vorax 

 Canu and Bassler. Operculum, X85. G-I. Petraliella vultur Hincks, 18S2 var. 

 arm at a Waters, 1913. G. Operculum, X85; H, I. Avicularian mandibles, X85. 

 J, K. Petraliella chuakensis Waters, 1913. J. Operculum, X85. K. Avicu- 

 larian mandible, X85. (G-K. After Waters, 1913.) L, M. Petraliella castanea 

 Busk, 1884. Avicularian mandible and operculum, X85. (After Waters, 1889.) 

 N, O. Petraliella thenar di Kirkpatriek, 1890. Avicularian mandible and aperture. 

 (After Kirkpatriek, 1890.) P. Petraliella bisinuata Smitt, 1873. Operculum, 

 X85. Q. Petraliella marginata Canu and Bassler. Operculum, X85. R, S. 

 Petraliella aviculifera Hincks, 1891. Operculum and avicularian mandible, 

 X85. (After Marcus, 1922.) T. Petraliella elleri MacGillivray, 1868, var. 



