NO. nil. PROCEEDINGS OF THE NATIONAL MUSEUM. 351 



to tbe descriptions of H. microstoma, the present species differs by 

 having- 17 whorls in a total length of 17.5 mm. against 18 whorls in 

 a lengtli of 15.5 mm. for H. microstoma, both having a maximum 

 diameter of 5 mm. The last whorl in the present species is rounded 

 below, that of H. microstoma angulated; in H. veracriiziana the aper- 

 ture is expanded, with the outer i)osterior part hardly angular where 

 the outer lip meets the parietal portion; the diameter of the aperture 

 is 3.5 mm. (against U.G in 11. microstoma), and the parietal portion is 

 very little extended beyond the periphery of the preceding whorl; 

 the whorls of the nucleus (li) are smooth and polished, those of the 

 apical cone linely ribbed, those of the rest of the spire striate, with a 

 few coarse riblets just behind the peristome. 



Three specimens from Mizantla, j^rovince of Vera Cruz, were presented 

 to the National ^luseum by the Mexican Geographical Commission. - 



This species has a strong, sliort fold at the base of the axis in the 

 penultimate Avhorl, but no traces of any other laminae It is possible 

 that the type of H. microstoma of Pfeifi'er may have the aperture abnor- 

 mal and be identical with this species, but, in the uncertainty, 1 have 

 preferred to name the latter. 



The following list comprises all the known species of Holospira to 

 date : 



Holospira goniostoma, Pfeiffer. Sonthwesteru Mexico. 



Holospira piloccrei, Pfeiffer. State of Puebla, Mexico. 



Holoapira goldfussi, Meuke. Southwestern Texas, west of Colorado River. 



H. (Jiostrichocentriim) iryoni, Pfeiffer. State of Puebla, jNIexico. 



H. { Bostrichocenfrum) veracriiziana, Dall. Vera Cruz, Mexico. 



H. (Haplostemma) mearnsU, Dall. New Mexico. 



jBT. {Eadistcmma) arizonensis, Stearns. Arizona. 



H. (IHsfomospira) hilamellata, Dall. New Mexico. 



Metastoma roemeri, Pfeiffer. Texas, west of the Colorado River. 



Metaatoma pasonis, Dall. El Paso County, Texas. 



Meta.stoma coahuUens'iH, W. G. Binney. Coahuila, Mexico. 



Metastoma seinisculjifa, Stearns. Chihuahua, Mexico. 



Metastoma pfcifferi. Meuke. Sonora, Mexico. 



Metastoma rcmondii, Gabb. Sonora, Mexico. 



Metastoma crossei, Dall. New Mexico. 



Metastoma pilsbryi, Dall. Puebla, State of Puebla, Mexico. 



M. (Cailosfemma) elizabetho}, Pilsbry. State of Guerrero, Mexico. 



The interior of the following species is unknown: 



Holospira gealei, H. Adams. Puebla, Mexico. 

 Holospira imhricata, Martens. Mexico. 

 Holospira cretacea, Pfeiffer. Mexico. 

 Holospira microstoma, Pfeiffer. Mexico. 

 Holospira teres, Meuke. Puebla, IMexico. 



Total, 22 species. 



The geographical distribution of the group is as follows: In the 

 southern extreme of Mexico, Puebla aftbrds 5, Vera Cruz 1, Guerrero 1, 

 and other localities probably in this region 4, in all 11 South Mexican 



