Occasional Papers of the Museum of Zoology 85 



pearance. The outermost teeth are strongly compressed trans- 

 versely. This radula is very similar to that figured by Pilsbry 

 (1902; Man. Conch., XIV, fig. LX-16) for D. int'erpunctus 

 (Martens). 



Oxystyla maracaihensis imitator Pilsbry 

 (1899; Man. Conch., XII, p. 140, fig. xxx, 49-54) 



Type locality : near Maracaibo, Venezuela. 



Distribution: Maracaibo, Venezuela, and Santa Marta, Co- 

 lombia, to Peru. Aruba : subfossil in the aloe fields on the 

 western side of the island. Four specimens collected about 1 

 km. south of Seroe Canashito. From the localities listed, this 

 appears to be a desert form. 



Although all of my specimens are badly bleached, from one 

 to three spiral bands and two or three varices can be made out. 

 One specimen is almost a perfect duplicate of fig. 54 in 

 Pilsbry {I.e.). 



Measurements 



altitude maj. diam. min. diam. alt. apert. diam. apert. whorls 



45.4 61(27.5) 52(23.7) 56(25.5) 69(17.6) 7 



ACHATINIDAE 



Genus Neosubulina, subgenus s. s. 



Neosubulina Smith (1898; P. Mai. S., Ill, p. 115); monotype Neo- 

 subulina harterti Smith, from Bonaire. 



Shell : ovate-turrite ; light-colored and translucent. Whorls : 

 numerous. Growth-wrinkles of last whorl: well defined. 

 Embryonic shell (dissected out from parent) : 214 to 2i/^ 

 whorls ; with delicate and regular growth-wrinkles crossed by 

 spiral striations, which extend to the very apex. Umbilicus: 

 rendered imperforate by expansion of columellar-parietal 

 callus. Peristome : thin, sharp, incomplete ; lower palatal wall 

 broadly and slightly emarginate; with a twisted thickening 

 around the columella, which is present even in the embryonic 

 shell ; parietal wall with a spiral lamella in the adult. Repro- 



