278 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
PLATE 18. 
The dunes south of Rio Grande do Norte, near the mouth of the river. See pages 
95 and 121. 
PLATE 19. 
The dunes north of the mouth of the river at Rio Grande do Norte This is a | 
characteristic bit of the coast north of Natal. See page 122. 
PLATE 20a. 
The northern end of the stone reef at Natal, taken from the anchorage behind the 
reef, Part of panorama with Plate No. 20 b. See pages 95-89. 
PLATE 20b. 
The stone reef at Rio Grande do Norte, from the anchorage behind the reef. The 
fort (Fortaleza dos Reis Mages).is built upon the reef. This plate forms a 
OB 
panorama with Plate 20a. See pages 35-39. 
PLATE 21. 
The southern part of the Cunhahú stone reef, looking north from the dunes. See 
pages 40-45. 
PLATE 22. 
Looking south over the north end of the Cunhahú stone reef toward Bahia Formosa. ; 
See pages 40-45. [ 
PLATE 23. 
The north end of the Cunhahú stone reef at low tide where it joins the land. See 
pages 40-45. 
PLATE 24. 
Looking northward toward Ponta da Pipa and the north end of the Sibaúma reef. 
See pages 40-45. 
PLATE 25. 
Boulder-like masses of sand held together by worms; on the beach one mile north 
of Bahia Formosa. See pages 44 and 45. 
PLATE 26a. 
The south end of the Traição sandstone reef, at low tide. (No. 26b joins this on 
the right to form panorama.) See pages 45-47. 
