20 University of Michigan 



On either side, the overhanging shore cliffs (8.2 meters) 

 extend for a short distance inland; the calcareous zone at 

 their summits is very narrow. The valley mouth itself is 

 choked with mangroves and brush. 



Station Cl8. Limestone renmant (18-K; L69° 9.88', 12° 

 21.41'). North of Plaja Abau, the older limestone formation 

 is mainly limited to the short cliffs. A small isolated renmant 

 (25 meters) about 400 meters north of Plaja Abau, was col- 

 lected during a shower. The rapidity with which the cyclo- 

 stomes, and even the cerions, are activated by the rain, is 

 astonishing; copulation seems to be the first motive after re- 

 lease from aestivation. Peculiarly enough, the specimens of 

 Tudora fossor westpuntensis from this station are very small, 

 while those of Cerion uva knipensis are among the largest 

 collected. 



Station C19. Westpmit (19-M; L69° 10.52', 12° 22.94'). 

 The top (9.9 meters) of the shore cliffs at Westpunt, which is 

 northwest of the hamlet of the same name, is bordered with a 

 narrow strip of quite barren, older limestone, dirtied by 

 abundant pockets of the characteristic reddish residue. Cacti 

 form the major portion of the very sparse vegetation. 



Station C20. Tafelberg of Sint Hyronimus (20-N; L69° 

 6.90', 12° 19.32'). ^s This high, isolated mesa (229.9 meters), 

 more commonly known as Sint Hyronimusberg, is one of the 

 most conspicuous landmarks of Curacao. The ancient lime- 

 stone cap is thin, so that the encircling escarpments are low, 

 but the reddish slopes of the underlying, diabasic rocks are 

 also quite steep. The leeward side is well wooded, as is also 

 a portion of the top, but the omnipresence of reddish residual 

 du.st appears to make this a rather barren habitat for land 

 molluscs. 



Station Chl6. Near Landhuis Sint Kruis (16-B ; L69° 8.86', 

 12° 18.49'). Southeast of the head of Sint Kruis Baai, an 

 outcrop of Cretaceous rocks is crowded with a dense growth 

 of organ-pipe cacti. Among these, a few land shells were 

 collected. 



18 See Boldingh, p. 157; "The limestone table-land on Hieronymus- 

 berg. ' ' 



