88 University of Michigan 



Neosubulina gloynii (Gribbons) 



Cionella gloynii Gibbons (1879; J. of Conch., II, p. 135, fig. I-l) ; 

 W. G. Binney (1883; Ann. N. Y. Acad. Sci., Ill, p. 101, fig. vii-3); 

 radula. Leptinaria gloynii mimiscula Pilsbry (1907; Man. Conch., 

 XVIII, p. 323, fig. xlvii-18) ; small form. Leptinaria gloynii H. B. 

 Baker (1923; this series, no. 137, p. 5, figs. I, 1-3). 



Type locality: "St. Ann's, numerous under stones," 

 Curagao; probably the Scliaarlo (C5c), back of Willemstad. 



Distribution : Curagao ; in the richer localities, both on lime- 

 stone (Cl-6, 11, 12, 15, 17, 20) and in the central region (Cb2, 

 6, 17, 20) ; not found near the shore but reaching an altitude 

 of 1,200 feet on Sint Christoffelberg. Habits as in harterti. 

 This is the only species that was found in the groves of poison- 

 ous manzalienja trees along the inland water-courses; it was 

 found in only one such locality (Cb2), although the thick 

 layers of fallen leaves in these places look like rather favorable 

 localities for land molluscs. 



Shell (fig. xvi-62) : cloudy pearl-colored, usually more 

 opaque than the other two species ; averages larger and tapere 

 more abruptly near the apex than does harterti. Whorls : 9% 

 (maximum observed) ; later whorls slightly stouter (especially 

 near the middle of the shell) and lower than in harterti, each 

 convex above the middle and tapering and flat-sided below so 

 that they appear to telescope into each other ; suture more pro- 

 nounced and slightly less oblique. Sculpture of last whorl : 

 growth-wrinkles coarser but more obscure and irregular than 

 in harterti, also more oblique and markedly arcuate just below 

 the suture ; spiral sculpture quite absent. Aperture : slightly 

 more elongate and with long axis more oblique to that of shell. 

 Peristome: columellar truncation of the adult more pro- 

 nounced; parietal lamella heavier than in harterti, developed 

 as a marked angulation (cf. 1923, /. c, fig. 3) on the central 

 axis of last and penultimate whorls, low but distinct on the 

 smaller embryonic shell (fig. xvi-59) ; lower palatal emargina- 

 tion more pronounced than in harterti. 



In the more barren localities, the shells are usually somewhat 

 smaller and may be included in the form minuscula (Pilsbry). 



