22 SPIRAXIS. 



Spiraxis tennis PFR., Malak. Bl. xv, 1868, p. 84; Monogr.. 

 viii, 257. FISCHER & CROSSE, Miss. Sci. Mex., Moll, i, p. 614, 

 pi. 25, f. 5. MARTENS, Biologia Centr. Amer., Moll., p. 309. 



"Related to Sp. acus Shuttl. and euptychus Pfr. but dis- 

 tinguished from them by the very thin, pellucid shell with 

 rather obtuse apex, and the equally close costulae throughout. ' ' 

 (Pfr.). 



9. S. URUAPAMENSIS Pdlsbry. PL 2, figs. 12, 13. 



Shell turreted-conic, decidedly tapering, the lateral outlines 

 a little concave above; corneous, with white riblets; apex 

 obtuse. Whorls 7%, very convex, separated by deeply im- 

 pressed sutures ; first half whorl smooth, following whorl very 

 finely lamellose-striate ; succeeding whorls with numerous, 

 delicate, raised riblets, about 42 in number on the penulti- 

 mate whorl. Aperture short-oval, somewhat trapezoidal; 

 columella thick, strongly sinuous. Length 5.2, diam. 2 mm. 



Mexico : Uruapam, State of Michoacan. 



Spiraxis uruapamensis PILS., Proc. A. N. S. Phila. 1899 r 

 p. 398 ; 1903, p. 775, pi. 50, f . 9, and fig. between 9 and 10. 



This species is more obtuse than 8. sulciferus and its variety 

 berendti-, has more convex whorls than S. tenuecostatus Streb., 

 and is stouter than S. miradorensis Streb., with closer riblets. 

 8. tennis is an allied form which should be compared. 



10. S. SCALELLA Martens. PI. 2, fig. 16. 



Shell conoid-turrite, sculptured with straight, compressed,, 

 close rdblets, yellowish- white, diaphanous; whorls 5, regularly 

 increasing, very convex below the suture, the last a little con- 

 cavely tapering at the base. Aperture ovate, narrowed below,, 

 the columellar margin moderately twisted, thin. Length 2.33, 

 diam. .75, aperture .66 x .5 mm. (Marts.). 



Costa Rica : El Pital, in the valley of the Rio Naranjo 

 (Pittier). 



Spiraxis scalella MARTS., Biologia p. 311, pi. 18, f. 5 (April, 

 1898) . 



' ' In the very convex whorls this species 'resembles S. scalari- 

 opsis, and it mdght also be compared with a Scalaria, but the 



