66 HOLOSPIRA. 



Cylindrella polygyrella v. MART., P. Z. S., 1863, p. 411; 

 Jahrb. d. Malak. Ges., iii, 1876, p. 261, pi. 9, f. 8. PFR,, 

 Monogr., viii, p. 622. Holospira polygyrella v. MABT., Bio- 

 logia Central! Americana, Moll., p. 284, pi. 17, f. 1, 1 a, fc. 

 Epirobia morini STREBEL, Beitrag, iv, p. 87, pi. 5, f . 3 ; pi. 13, 

 f. 4 (radula) ; pi. 14, f. 15 A, B, c. Not C. morini Morelet. 



"Distinct from the preceding by its smaller size (length 

 14, in one specimen 17 mm.), the more convex and broader 

 whorls (the visible part of the lower whorls 2% times as broad 

 as high, instead of !%-!% times, as in E. polygyra), and the 

 distinctly transverse, pear-shaped or triangular aperture" 

 (v.Mart.). 



Strebel has figured the internal pillar as more rugose 

 than shown in v. Martens' figure. The teeth of the radula, 

 as figured by Strebel, resemble those of E. polygyra in form. 



Genus HOLOSPIRA von Martens, 1860. 



Acera ALBERS, Die Heliceen, 1850, p. 209. Not Akera 

 Miiller, 1776, nor Acera Cuvier, 1810. Holospira v. MARTENS 

 in Alb., Die Hel., edit. 2, p. 39 (I860). CROSSE & FISCHER, 

 Journ. de Conchyl., 1870, p. 13 ; Miss. Scient. au Mex., Moll., 

 i, p. 318. STREBEL, Beitrag Mex. Land- und Susswasser- 

 Conch., iv, p. 82 (1880). D ALL, Nautilus, ix, p. 50 (1895) ; 

 Proc. U. S. Nat. Mus., xix, p. 346 (1897). v. MARTENS, Bio- 

 logia Centrali Amer., Moll., p. 273, 



Shell small, cylindric, terminating above in a conic spire, 

 retaining all the whorls, rimate or perforate. Whorls 11-21, 

 the first I~y 2 smooth, the rest smooth, striate or ribbed, closely 

 coiled, the suture superficial; last whorl more or less built 

 forward. Aperture small, obliquely pear-shaped, rounded or 

 oval, the peristome expanded or reflected, continuous and usu- 

 ally free throughout. Internal column hollow, variously 

 sculptured or smooth. Type H. pilocerei Pfr. (holos, entire, 

 and speira, spire) . 



Geographic range extending from southern Mexico to Texas, 

 Arizona and New Mexico ; but not reaching Lower California, 

 or on the southeast, Guatemala. Confined chiefly to the ele- 

 vated plateau, where they live under cacti, etc., in sunny 

 places. 



