472 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



Fig. 201. — Genus Chaperia Jullien, 1881 



A-C. Chaperia transversalis Opercula, X85. D-G. Chaperia acanthina Quoy 

 and Gaimard, 1824. Four opercula. (F. After Kirkpatrick, 1890; G, X85. 

 After Waters, 1895.) H, I. Chaperia spinosissima Calvet, 1904. Two opercula. 

 (After Calvet, 1904.) J, K, L. Chaperia galeata var. bilaminata Waters, 1898. 

 J. Operculum of ovicell. K. Operculum of the aperture. L. Avicularian 

 mandible, X85. (After Waters, 1898.) M. Chaperia capensis Busk, 1884. 

 Operculum. N, O. Chaperia imbricata Busk, 1884. N. Operculum. O. Avicular- 

 ian mandibles. (M-0 After Busk, 1884.) P. Chaperia australis Jullien, 1884, 

 sketch showing the arrangement of muscles, X45. om, opercular muscles; pv, 

 parietovaginal muscles; p., parietal muscles. (After Marcus, 1922.) 



Fig. 202. — Chaperia acanthina Quoy and 

 Gaymard, 1824. Two opercula, X85 



