104 HOLOSPIRA. 



27. H. CRETACEA (Pfeiffer). PL 15, figs. 16, 17. 



Shell rimate, oblong- turreted, cretaceous; spire more swol- 

 len in the middle, the apex subtruncate or terminating in a 

 short cone; suture shallow. Whorls 13-14, a trifle convex, 

 smooth, the penultimate semiplicate, the last strongly ribbed, 

 base compressed-carinate, anteriorly horizontally and shortly 

 built forward. Aperture vertical, subtriangular ; peristome 

 continuous, rectangularly spreading throughout. Length 

 24, diam. 7, oblique length of aperture 5%, width 4% mm. 

 (Pfr.) 



Mexico (Cuming coll.). 



Cylindrella cretacea PFR., P. Z. S., 1860, p. 140; Malak. 

 Blatter, 1861, p. 81; Monogr., vi, p. 389. Holospira cretacea 

 Pfr., F. & C., Miss. Scient. Hex., Moll., i, p. 335, pi. 17, f. 8. 

 v. MART., Biologia, p. 279. 



The interior is unknown. External features indicate, as 

 von Martens remarks, a relationship with H. coahuilensis. 



28. H. TERES (Menke). PL 15, figs. 18, 19, 20. 



Shell cylindrical, with conic entire and acute apex, rimate, 

 somewhat solid, opaque, white (Candida), shining. Whorls 

 14, a little convex, the upper smooth, lower densely and ob- 

 liquely, delicately costellate, scarcely protracted. Aperture 

 orbiculate; peristome continuous, free, reflexed. Length 

 9.7, diam. 2.2 lines. (Menke.) 



State of Pueblo, Mexico (Liebmann). 



Cylindrella teres Mke., Zeitschr. f. Malak., iv, p. 1 (1847). 

 PHILIPPI, Abbild., iii, p. 5, pi. 3, f. 5, 6. PFR., Monogr., ii, 

 p. 381 ; Conchyl. Cab., p. 59, pi. 6, f . 28, 29. Holospira teres 

 Mke., FISCH. & CROSSE, Moll. Mex., p. 327. CROSSE, Journ. 

 de Conch., 1892, p. 263. v. MART., Biologia, p. 279. H. t. 

 var. minor MARTENS, 1. c., based upon var. B, Fischer & Crosse, 

 1. c., pi. 17, f. 3; cf. CROSSE, J. de C., 1892, p. 264, pi. 5, f. 9.- 

 H. t. var. hogeanav. MART., 1. c., p. 280, pi. 16, f. 17. 



A white, earthy species of rather large size, Pfeiffer giving 

 the dimensions, length 22, diam. 5% mm.; aperture 4 mm. 

 long, 4% wide. Nothing is known of its internal structure. 



Form minor v. Martens. (PL 15, figs. 21, 22.) Smaller 



