264 ANTILLEAN OBELISCUS. 



the striae stronger below the suture. The embryonic and early 



whorls are decidedly larger than in S. bacillus. The figured 



specimens measure : 



Length 17, dia.m. 4.3, aperture 4.7 mm. ; whorls 

 Length 18, diarn. 4.2, aperture 4.4 mm. ; whorls 

 The largest of an abundant series taken near Sancti Spir- 



itus, Pro<v. Santa Clara, measures: length 17.5, diam. 3.9, 



apert. 4.5 mm., whorls 



Var. zaza nov. PI. 40, figure below fig. 4. 



On the rocky hill at Zaza del Medio, Prov. Santa Clara, I 

 found a slender form of the species. The very pale greenish- 

 yellow shell is composed of 9 to 9^2 whorls ; the spire is more 

 slender and tapers more regularly than in 0. homalogyra, 

 the lateral outlines being straight. In adult shells the later 

 whorls have a white-bordered suture. 



Length 18.5, diam. 3.9, aperture 4 anm. ; whorls 

 Length 18, diam, 4, aperture 4.3 mm. ; whorls 9. 

 Length 17.3, diam. 3.7, aperture 4 mm. ; whorls 

 In 0. bacillus Pfr. the early whorls are more attenuate 

 than in these shells. 



22. 0. TEREBRASTER (Lamarck). PI. 30, figs. 5, 6, 11, 12. 



Shell cylindric-turrite, somewhat glabrous, 'Corneous-brown- 

 ish; whorls 9, flattened, the last more ventricose; lip thin, 

 acute. Length 9 to 10 lines (Lam.). 



Porto Rico (Mauge, type loc.). San Juan, Ceiba, Huma- 

 cao and Luquillo (Blauner) ; Quebradillas, Vegabaja and 

 Las Marias (Gundlach) ; Loisa (Swift). 



? Helix terebraster FERUSSAC, Prodrome, p. 55, no. 370, 110 

 description. Bulimus terebraster Lam., An. s. Vert., vi, pt. 

 2, p. 124, no. 28 (April, 1822) ; Edit, Desh., viii, p. 234.- 

 MENKE, Zeitschr. f. Malak., 1853, p. 63. PFR., Monogr., iii, 

 653. Stenogyra (Obeliscus) terebraster Fer., SHUTTL., Diag- 

 nosen n. Moll., no. 6, p. 140, in Mittheil. naturf. Ges. Bern, 

 1854, p. 48. Stenogyra t., MARTENS, Conch. Mittheil., i, p. 

 94, pi. 17, f. 9-11; Jahrb. d. Mai. Ges., iv, 1877, p. 349; 

 Nachrichtsblatt, xxiii, 1891, p. 132. ROSSE, Journ. de dm- 



