Cerion uva bonairensis, new subspecies

Type locality: (B5) Porta Spaño, Bonaire.

Distribution: Bonaire; everywhere on limestone (B1 to B9), and in the richer habitats on the older rocks (Bb3, 7, 9). Klein-Bonaire: everywhere (K1). 343 adults collected.

In this subspecies (Plate XXI), as in arubanum, the palatal wall of the peristome projects out markedly from the preced­ing 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 bonair­ensis (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 Curaçao, the Bonaire lots vary in size with the richness of the locality. Typical bonairensis (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.