Occasional Papers of the Museum of Zoology 61 



Measurements 

 Shell Aperture Operculum Whorls 



alt. maj.diam. min.diam. alt. diam. long wide 

 male 14.6 68( 9.9) 53( 7.7) 51(7.4) 95(7.0) 32(4.7) 83(3.9) 414 

 female 

 (type) 19.0 68(13.0) 53(10.1) 52(9.9) 96(9.5) 33(6.2) 79(4.9) 4% 



C12a. Very common (115 specimens collected). Typical lot (see 

 Table VI) ; on account of the great expansion of the peristome, the 

 dimensions give the impression of a more elongate shell than is actually 

 the case. 



C12b. Common (89 specimens). T\-pical rondeklipensis, but more 

 bleached in color. 



Cllab. Very common (lib) to frequent (11a); 108 specimens. 

 Similar to 12b, but with sculpture considerably reduced. A few closely 

 approach form desculpta. 



CI led. Quite abundant (176 specimens). Bleached and rather small. 

 A very large proportion approach form desculpta, and in several speci- 

 mens the spiral sculpture is absent on the last whorl. 



CIO. Infrequent; living specimens mainly on Cereus and under rocks 

 at the base of these cacti (95 specimens). Big, heavy shells, usually with 

 well developed sculpture, although a few show an approach to desculpta. 

 Very much bleached in color and stained with a rusty deposit ; even more 

 so than Tudora aurantia wassauensis from B9, where the conditions are 

 somewhat similar. 



CblO. Rare (2 specimens). 



Tudora megacheilos kabrietensis, new subspecies 



Type locality: (C3) low, limestone escarpment near shore 

 of Caracas Baai, and a short distance north of Fort Beeken- 

 burg, southern Curasao. 



Distribution : Curacao ; near western shore, from New Port 

 to Caracas Baai (CI, 3), north of which it intergrades slightly 

 with typical megacheilos. 69 specimens collected. 



Color: similar to megacheilos, but bleached; pattern ob- 

 scure. Sculpture of last whorl (figs. xiii-E) : numerous, com- 

 pressed, angular, spiral ridges, surmounted by the growth 

 sculpture, which develops slight, subpyramidal cusps at the 

 intersections. Interior of aperture : white to dark orange and 

 light chocolate; usually with markedly darker, spiral bands. 

 Peristome : more deeply and extensively expanded than in 

 megacheilos. Other characters similar to typical subspecies. 



