88 



HOLOSPIRA. 



clear, polished, and smooth; blunt above, gradually increas- 

 ing to the ninth whorl and subsequently slightly attenuated; 

 sculpture and aperture much as in H. crossei, the base 

 slightly appressed and the ribs closer and more prominent 

 than on the previous whorls; umbilicus not conspicuous; 

 aperture projecting somewhat beyond the preceding whorl, 

 the peristome hardly reflected, subtriangular, little thick- 

 ened, without folds; axis small, subcylindric, with a strong, 

 short lamella near the base in the penultimate whorl. 

 Length of shell 14.5, maximum diameter 4.5 mm. (Dall). 



New Mexico: top of Hachita Grande Mountain, Grant 

 county (Dr. Mearns) ; found with H. crossei, but less com- 

 mon ; no. 129991, U. S. N. M. 



Holospira (Haplostemma) mearnsii DALL., Proc. U. S. Nat. 

 Mus., xviii, p. 4 (1895) ; xix, p. 350, pi. 31, f. 1 (1897). 



This species resembles H. crossei in general appearance, 

 but is larger, with more projecting aperture, and frequently 

 has an intercalary raised line dividing the interspaces of the 

 ribs axially. The specimens are of a whitish color (Dall). 



13. H. HAMILTONI Dall. PL 23, figs. 72, 73. 



Shell slender, polished, spindle-shaped, pinkish-white, with 

 a darker livid apex, and about 13 whorls; nucleus blunt, 

 smooth, later three whorls delicately obliquely striated, cen- 

 tral whorls smooth, last whorl with delicate oblique riblets 

 with wider interspaces; aperture projected, rounded, sub- 

 angular at the right posterior corner, the lip entire, reflected, 

 the pillar rather' wide ; the last whorl flattened and attenu- 

 ated. Length 19, max. diam. 5 mm. (Dall). 



Texas : Rio Grande Mts., Brewster Co., at a height of 3,500 

 feet, living on Selaginella lepidophylla Spring (James M. 

 Hamilton) ; U. S. Nat. Mus, no. 107759. 



Holospira (Haplostemma) hamiltoni DALL, Nautilus, xi, 

 p. 38 (August, 1897) ; Proc. U. S. Nat. Mus., xxiv, p. 501, 

 pi. 28, f. 2, 11 (1902). 



"This species is very much like H. (Metastoma) semistriata 

 [semisculpta] Stearns, externally, differing in its smaller and 

 more slender shell and finer and more delicate sculpture of 

 the later whorls near the aperture." 



