106 University of Michigan 



In this subspecies (Plate XXI), as in arubanum, the palatal 

 wall of the peristome projects out markedly from the preced- 

 ing whorls. However, the aperture is usually broader, instead 

 of twisted tangentially, so that the umbilicus is smaller, and 

 more like that of the typical subspecies. Also, C. uva honair- 

 ensis (Table XIV) has high whorls similar to knipensis, and 

 the cleaned surface of the shell resembles dead-white enamel 

 while that of the other species is chalky-white or porcellanous. 

 As in the subspecies from Curasao, the Bonaire lots vary in 

 size with the richness of the loealitj^ Typical honairensis 

 (fig. xxi-F6) includes the larger shells of the series, while the 

 smaller lots may be called form kralendijki, new (fig. xxi-A2), 

 with the recent limestone just south of Kralendijk (Bl) as 

 the type locality. Although the cerions of Bonaire invade the 

 central regions of older rocks to a considerable extent, the form 

 desculptum appears to be quite absent. 



Introduced and Doubtful Species 

 Outside of the hof je of Campo Knip, and a few borders near 

 the highways, no detailed examination of the cultivated ground 

 was made. A more thorough study of the irrigated fields and 

 gardens would probably add considerably to the following list. 

 Some of the coco plantations and orchards are several acres in 

 extent, and the borders of the better watered ones have de- 

 veloped considerable leaf mould. However, such introduced 

 species have no bearing on the zoogeographical affinities of the 

 islands and, while interesting, w^ould certainly add very little 

 to our knowledge of the natural fauna. 



TRUNCATELLIDAE 



Truncatella hilahiata (Pfeiffer) 

 The last II/2 whorls of a bleached shell, from the hofje of 

 Campo Klein Piscadera (Cb7). This belongs to the almost 

 smooth form of the species, and the growth-ribs are only rep- 

 resented by buttresses near the suture. 



. HELICIDAE 



ThysanopJiora cj-inita arubana H. Burrington Baker 

 One dead, bleached specimen, from the hofje of Klein Pisea- 



