Occasional Papers of the Museum of Zoology 89 



Otherwise the species appears quite constant throughout the 

 island. 



Neosubulina scopulorum, new species 



Type locality: (A3) at base of right wall of entrance to 

 Rooi Frances, Aruba. 



Distribution : ' Aruba ; richer localities on the limestone 

 (A2^). Habits as in /lar^erfi. 



Shell (fig. xvi-63) : bright horn-colored, quite transparent; 

 tapers abruptly near the apex as in gloynii, but is also con- 

 stricted noticeably just below the middle; attains a much 

 larger size (and greater number of whorls) than do the other 

 two species. Whorls: 11% (maximum observed) ; apical and 

 subapical quite similar to gloynii ; those just below the middle 

 markedly elongate, convex below the suture but flat-sided and 

 tapering below the convexity so that the telescopic appearance 

 is even more marked than in gloynii ; suture more pronounced 

 and oblique. Sculpture of last whorl : growth-wrinkles more 

 closely-spaced and angular than in gloynii, but coarser than in 

 Jiarterti, slightly less oblique than in the former but similarly 

 arcuate just below the suture ; spiral sculpture only indicated 

 by broad and obscure constrictions. Aperture : shaped much 

 as in gloynii, but with long axis slightly less oblique to that of 

 shell. Peristome : columellar truncation and parietal lamella 

 of adult higher and larger than in gloynii, relatively as pro- 

 nounced in the larger embryonic shell (fig. xvi-60) as in the 

 adult ; lower palatal emargination as in gloynii. 



Radula : C/3, L9/3, M12/4 + ; or 21-1-21. Very similar to 

 that of hai'terti, but the laterals decrease in size more gradu- 

 ally and the first 9 teeth are tricuspid. Jaw : very similar to 

 harterti. 



The embryonic shells figured (figs, xvi, 58-60) were all dis- 

 sected out of the bodies of the parent shells. As large eggs 



