80 University of Michigan 



expansion, which becomes broader in the successive laterals 

 until, in the 7th tooth, it develops a small cusp. This cusp be- 

 comes larger on the 8th, while, in the 9th, the ectocone also 

 becomes bifid. In the outer marginals, the ectocone breaks up 

 still more, but the inner two cusps remain about the same. 

 The outermost tooth is a mere denticle. Jaw (fig. xiv-51) : 

 thin, slightly arcuate; consists of 25 to 27, transverse plates, 

 which serrate the margins, but appear to be well fused 

 together. 



Measureinents 



altitude maj. diam. min. diam. alt. apert. diam. apert. whorla 



2.58 165(4.19) 150(3.92) 55(1.43) 135(1.95) 4% 



This species appears to be somewhat similar to the small 

 Thysanophorae of Porto Rico and the northern Lesser Antilles, 

 such as T. suhaquila (Shuttleworth). It is smaller and has a 

 relatively larger umbilicus. 



BULIMULIDAE 



Drymaeus virgulatus (Ferussac) 



Eelix elongata "Bolten" Roeding (1798; Mus. Bolt., 107). Helix 

 virgulata Ferussac (1821; Tabl. Syst., 54; Hist. fig. cxlii, 1-7). 

 Bulimulus apicidatiis Gray (1834; P. Z. S., 66); the form with the 

 bluish apex. H. ludovica "Rang" Beck (1837; Index, 66); reddish, 

 unicolor form. Bulimus elongatus Bland (1861; Ann. Lye. Nat. Hist. 

 N. Y., VII, 143) ; first Bonaire record. Bulimus elongatus Bland (1866; 

 Amer. J. Conch., II, 143) ; first Curasao record. Bulimulus elongatus 

 Smith (1898; Proc. Mai. Soc, III, 114); first Aruba record; collected 

 by Hartert. 



Type locality : Porto Rico. 



Distribution: Porto Rico; northern Lesser Antilles; Vene- 

 zuela? Curasao: in the richer places throughout the island 

 (CI, 2, 4, 9, lied, 12a, 13-17, 20; Cbl6, 17). Aruba: Seroe 

 Canashito and Rooi Taki (A4a, 2c). Bonaire: in the better 

 wooded places throughout the island (B3, 4, 5, 6, 7, 8 ; BbS, 7). 

 Usually found cemented to the trunks or branches of the larger 

 trees; often found on the gumbo limbo {Bur sera gummifera) 



