Report of U. S. National Museum, 1897.— Flinl. 



Plate 49. 



Fig. 1. PENEROPLIS PERTUSUS Forskal, var. DISCOIDEUS, new. See Page 304. 



a. Incomplete Section 



Fig. 2. PENEROPLIS PERTUSUS Forskal. i by transmitted light.) See Page 304. 



